Cisco Industrial Ethernet 4000, 4010 and 5000 Switch Software. Configuration Guide (2022)

Configuring IP Unicast Routing

Related Documents, page 998

Information About IPv6

IPv4 users can move to IPv6 and receive services such as end-to-end security, quality of service (QoS), and globally

unique addresses. The IPv6 address space reduces the need for private addresses and Network Address Translation

(NAT) processing by border routers at network edges.

This section describes IPv6 implementation on the switch and includes the following topics:

IPv6 Addresses, page 969

Supported IPv6 Unicast Routing Features, page 970

Unsupported IPv6 Unicast Routing Features, page 974

IPv6 Addresses

The switch supports only IPv6 unicast addresses. It does not support site-local unicast addresses, anycast addresses,

or multicast addresses.

The IPv6 128-bit addresses are represented as a series of eight 16-bit hexadecimal fields separated by colons in the

format: n:n:n:n:n:n:n:n. This is an example of an IPv6 address:

2031:0000:130F:0000:0000:09C0:080F:130B

969

Configuring IPv6 Unicast Routing

Information About IPv6

For easier implementation, leading zeros in each field are optional. This is the same address without leading zeros:

2031:0:130F:0:0:9C0:80F:130B

You can also use two colons (::) to represent successive hexadecimal fields of zeros, but you can use this short version

only once in each address:

2031:0:130F::09C0:080F:130B

For more information about IPv6 address formats, address types, and the IPv6 packet header, see IPv6 Addressing and

Basic Connectivity Configuration Guide, Cisco IOS Release 15M&T in the IPv6 Configuration Library, Cisco IOS Release

15M&T.

In the “Information About Implementing Basic Connectivity for IPv6” chapter, these sections apply to the switch:

IPv6 Address Formats

IPv6 Address Type: Unicast

IPv6 Address Output Display

Simplified IPv6 Packet Header

Supported IPv6 Unicast Routing Features

Support on the switch includes expanded address capability, header format simplification, improved support of

extensions and options, and hardware parsing of the extension header. The switch supports hop-by-hop extension

header packets, which are routed or bridged in software.

The switch provides IPv6 routing capability over 802.1Q trunk ports for static routes, Routing Information Protocol (RIP)

for IPv6, and Open Shortest Path First (OSPF) Version 3 Protocol. It supports up to 16 equal-cost routes and can

simultaneously forward IPv4 and IPv6 frames at line rate.

Note: For more information about the IPv6 unicast routing features described in this section, see IPv6 Configuration

Library, Cisco IOS Release 15M&T and IPv6 Implementation Guide, Cisco IOS Release 15.2M&T.

128-Bit Unicast Addresses, page 971

DNS for IPv6, page 971

Path MTU Discovery for IPv6 Unicast, page 971

ICMPv6, page 971

Neighbor Discovery, page 971

Default Router Preference, page 972

IPv6 Stateless Autoconfiguration and Duplicate Address Detection, page 972

IPv6 Applications, page 972

Dual IPv4 and IPv6 Protocol Stacks, page 972

DHCP for IPv6 Address Assignment, page 973

Static Routes for IPv6, page 973

RIP for IPv6, page 973

OSPF for IPv6, page 973

970

Configuring IPv6 Unicast Routing

Information About IPv6

EIGRP IPv6, page 973

Multiprotocol BGP for IPv6, page 973

SNMP and Syslog Over IPv6, page 974

HTTP(S) Over IPv6, page 974

128-Bit Unicast Addresses

The switch supports aggregatable global unicast addresses and link-local unicast addresses. It does not support

site-local unicast addresses.

Aggregatable global unicast addresses are IPv6 addresses from the aggregatable global unicast prefix. The address

structure enables strict aggregation of routing prefixes and limits the number of routing table entries in the global

routing table. These addresses are used on links that are aggregated through organizations and eventually to the

Internet service provider.

These addresses are defined by a global routing prefix, a subnet ID, and an interface ID. Current global unicast

address allocation uses the range of addresses that start with binary value 001 (2000::/3). Addresses with a prefix

of 2000::/3(001) through E000::/3(111) must have 64-bit interface identifiers in the extended unique identifier

(EUI)-64 format.

Link local unicast addresses can be automatically configured on any interface by using the link-local prefix

FE80::/10(1111 1110 10) and the interface identifier in the modified EUI format. Link-local addresses are used in the

neighbor discovery protocol (NDP) and the stateless autoconfiguration process. Nodes on a local link use link-local

addresses and do not require globally unique addresses to communicate. IPv6 routers do not forward packets with

link-local source or destination addresses to other links.

DNS for IPv6

IPv6 supports Domain Name System (DNS) record types in the DNS name-to-address and address-to-name lookup

processes. The DNS AAAA resource record types support IPv6 addresses and are equivalent to an A address record in

IPv4. The switch supports DNS resolution for IPv4 and IPv6.

Path MTU Discovery for IPv6 Unicast

The switch supports advertising the system maximum transmission unit (MTU) to IPv6 nodes and path MTU discovery.

Path MTU discovery allows a host to dynamically discover and adjust to differences in the MTU size of every link along a

given data path. In IPv6, if a link along the path is not large enough to accommodate the packet size, the source of the

packet handles the fragmentation. The switch does not support path MTU discovery for multicast packets.

ICMPv6

The Internet Control Message Protocol (ICMP) in IPv6 generates error messages, such as ICMP destination unreachable

messages, to report errors during processing and other diagnostic functions. In IPv6, ICMP packets are also used in the

neighbor discovery protocol and path MTU discovery.

Neighbor Discovery

The switch supports NDP for IPv6, a protocol running on top of ICMPv6, and static neighbor entries for IPv6 stations that

do not support NDP. The IPv6 neighbor discovery process uses ICMP messages and solicited-node multicast addresses

to determine the link-layer address of a neighbor on the same network (local link), to verify the reachability of the

neighbor, and to keep track of neighboring routers.

The switch supports ICMPv6 redirect for routes with mask lengths less than 64 bits. ICMP redirect is not supported for

host routes or for summarized routes with mask lengths greater than 64 bits.

971

Configuring IPv6 Unicast Routing

Information About IPv6

Neighbor discovery throttling ensures that the switch CPU is not unnecessarily burdened while it is in the process of

obtaining the next hop forwarding information to route an IPv6 packet. The switch drops any additional IPv6 packets

whose next hop is the same neighbor that the switch is actively trying to resolve. This drop avoids further load on the

CPU.

Default Router Preference

The switch supports IPv6 default router preference (DRP), an extension in router advertisement messages. DRP improves

the ability of a host to select an appropriate router, especially when the host is multihomed and the routers are on different

links. The switch does not support the Route Information Option in RFC 4191.

An IPv6 host maintains a default router list from which it selects a router for traffic to offlink destinations. The selected

router for a destination is then cached in the destination cache. NDP for IPv6 specifies that routers that are reachable or

probably reachable are preferred over routers whose reachability is unknown or suspect. For reachable or probably

reachable routers, NDP can either select the same router every time or cycle through the router list. By using DRP, you

can configure an IPv6 host to prefer one router over another, provided both are reachable or probably reachable.

IPv6 Stateless Autoconfiguration and Duplicate Address Detection

The switch uses stateless autoconfiguration to manage link, subnet, and site addressing changes, such as management

of host and mobile IP addresses. A host autonomously configures its own link-local address, and booting nodes send

router solicitations to request router advertisements for configuring interfaces.

IPv6 Applications

Ping, traceroute, Telnet, TFTP, and FTP

Secure Shell (SSH) over an IPv6 transport

HTTP server access over IPv6 transport

DNS resolver for AAAA over IPv4 transport

Cisco Discovery Protocol (CDP) support for IPv6 addresses

Dual IPv4 and IPv6 Protocol Stacks

You must use the dual IPv4 and IPv6 template to allocate hardware memory usage to both IPv4 and IPv6 protocols.

Figure 107 shows a router forwarding both IPv4 and IPv6 traffic through the same interface, based on the IP packet and

destination addresses.

Figure 107 Dual IPv4 and IPv6 Support on an Interface

IPv4

10.1.1.1

IPv6

3ffe:yyyy::1

Use the dual IPv4 and IPv6 switch database management (SDM) template to enable IPv6 routing dual stack environments

(supporting both IPv4 and IPv6).

972

Configuring IPv6 Unicast Routing

Information About IPv6

If you try to configure IPv6 without first selecting a dual IPv4 and IPv6 template, a warning message appears.

In IPv4-only environments, the switch routes IPv4 packets and applies IPv4 QoS and ACLs in hardware. IPv6 packets

are not supported.

In dual IPv4 and IPv6 environments, the switch routes both IPv4 and IPv6 packets and applies IPv4 QoS in hardware.

IPv6 QoS is not supported.

If you do not plan to use IPv6, do not use the dual stack template because it results in less hardware memory

availability for each resource.

DHCP for IPv6 Address Assignment

DHCPv6 enables DHCP servers to pass configuration parameters, such as IPv6 network addresses, to IPv6 clients. The

address assignment feature manages nonduplicate address assignment in the correct prefix based on the network where

the host is connected. Assigned addresses can be from one or multiple prefix pools. Additional options, such as default

domain and DNS name-server address, can be passed back to the client. Address pools can be assigned for use on a

specific interface, on multiple interfaces, or the server can automatically find the appropriate pool.

Static Routes for IPv6

Static routes are manually configured and define an explicit route between two networking devices. Static routes are

useful for smaller networks with only one path to an outside network or to provide security for certain types of traffic in

a larger network.

RIP for IPv6

Routing Information Protocol (RIP) for IPv6 is a distance-vector protocol that uses hop count as a routing metric. It

includes support for IPv6 addresses and prefixes and the all-RIP-routers multicast group address FF02::9 as the

destination address for RIP update messages.

OSPF for IPv6

The switch supports Open Shortest Path First (OSPF) for IPv6, a link-state protocol for IP.

EIGRP IPv6

The switch supports Enhanced Interior Gateway Routing Protocol (EIGRP) for IPv6. It is configured on the interfaces on

which it runs and does not require a global IPv6 address.

Before running, an instance of EIGRP IPv6 requires an implicit or explicit router ID. An implicit router ID is derived from a

local IPv4 address, so any IPv4 node always has an available router ID. However, EIGRP IPv6 might be running in a

network with only IPv6 nodes and therefore might not have an available IPv4 router ID.

Multiprotocol BGP for IPv6

Multiprotocol Border Gateway Protocol (BGP) is the supported exterior gateway protocol for IPv6. Multiprotocol BGP

extensions for IPv6 support the same features and functionality as IPv4 BGP. IPv6 enhancements to multiprotocol BGP

include support for IPv6 address family and network layer reachability information (NLRI) and next-hop (the next router

in the path to the destination) attributes that use IPv6 addresses.

The switch does not support multicast BGP or non-stop forwarding (NSF) for IPv6 or for BGP IPv6.

973

Configuring IPv6 Unicast Routing

Information About IPv6

SNMP and Syslog Over IPv6

To support both IPv4 and IPv6, IPv6 network management requires both IPv6 and IPv4 transports. Syslog over IPv6

supports address data types for these transports.

SNMP and syslog over IPv6 provide these features:

Support for both IPv4 and IPv6

IPv6 transport for SNMP and to modify the SNMP agent to support traps for an IPv6 host

SNMP- and syslog-related MIBs to support IPv6 addressing

Configuration of IPv6 hosts as trap receivers

For support over IPv6, SNMP modifies the existing IP transport mapping to simultaneously support IPv4 and IPv6. These

SNMP actions support IPv6 transport management:

Opens User Datagram Protocol (UDP) SNMP socket with default settings

Provides a new transport mechanism called SR_IPV6_TRANSPORT

Sends SNMP notifications over IPv6 transport

Supports SNMP-named access lists for IPv6 transport

Supports SNMP proxy forwarding using IPv6 transport

Verifies SNMP Manager feature works with IPv6 transport

HTTP(S) Over IPv6

The HTTP client sends requests to both IPv4 and IPv6 HTTP servers, which respond to requests from both IPv4 and IPv6

HTTP clients. URLs with literal IPv6 addresses must be specified in hexadecimal using 16-bit values between colons.

The accept socket call chooses an IPv4 or IPv6 address family. The accept socket is either an IPv4 or IPv6 socket. The

listening socket waits for both IPv4 and IPv6 signals that indicate a connection. The IPv6 listening socket is bound to an

IPv6 wildcard address.

The underlying TCP/IP stack supports a dual-stack environment. HTTP relies on the TCP/IP stack and the sockets for

processing network-layer interactions.

Basic network connectivity (ping) must exist between the client and the server hosts before HTTP connections can be

made.

Unsupported IPv6 Unicast Routing Features

IPv6 policy-based routing

IPv6 virtual private network (VPN) routing and forwarding (VRF) table support

Support for Intermediate System-to-Intermediate System (IS-IS) routing

IPv6 packets destined to site-local addresses

Tunneling protocols, such as IPv4-to-IPv6 or IPv6-to-IPv4

The switch as a tunnel endpoint supporting IPv4-to-IPv6 or IPv6-to-IPv4 tunneling protocols

IPv6 unicast reverse-path forwarding

IPv6 general prefixes

974

Configuring IPv6 Unicast Routing

Prerequisites

HSRP for IPv6

Prerequisites

Select a dual IPv4 and IPv6 template as described in the Dual IPv4 and IPv6 Protocol Stacks, page 972.

Guidelines and Limitations

Because IPv6 is implemented in switch hardware, some limitations occur due to the IPv6 compressed addresses in the

hardware memory. This results in some loss of functionality and some feature limitations.

When using user-network interface (UNI) or enhanced network interface (ENI) ports for any IPv6-related features,

you must first globally enable IP routing and IPv6 routing on the switch by entering the ip routing and ipv6

unicast-routing global configuration commands even if you are not using IPv6 routing.

ICMPv6 redirect functionality is not supported for IPv6 host routes (routes used to reach a specific host) or for IPv6

routes with masks greater than 64 bits. The switch cannot redirect hosts to a better first-hop router for a specific

destination that is reachable through a host route or through a route with masks greater than 64 bits.

Load balancing using equal cost and unequal cost routes is not supported for IPv6 host routes or for IPv6 routes with

a mask greater than 64 bits.

The switch cannot forward SNAP-encapsulated IPv6 packets.

There is a similar limitation for IPv4 SNAP-encapsulated packets, but the packets are dropped at the switch.

The switch routes IPv6-to-IPv4 and IPv4-to-IPv6 packets in hardware, but the switch cannot be an IPv6-to-IPv4 or

IPv4-to-IPv6 tunnel endpoint.

Bridged IPv6 packets with hop-by-hop extension headers are forwarded in software. In IPv4, these packets are

routed in software but bridged in hardware.

In addition to the normal SPAN and RSPAN limitations defined in the software configuration guide, these limitations

are specific to IPv6 packets:

— When you send RSPAN IPv6-routed packets, the source MAC address in the SPAN output packet might be

incorrect.

— When you send RSPAN IPv6-routed packets, the destination MAC address might be incorrect. Normal traffic is

not affected.

The switch cannot apply QoS classification or policy-based routing on source-routed IPv6 packets in hardware.

The switch cannot generate ICMPv6 Packet Too Big messages for multicast packets.

975

Configuring IPv6 Unicast Routing

Default Settings

Feature

Default Setting

SDM template

Default.

IPv6 routing

Disabled globally and on all interfaces.

CEFv6

Disabled (IPv4 CEF is enabled by default).

Note: When IPv6 routing is enabled, CEFv6 is automatically enabled.

IPv6 addresses

None configured.

Configuring IPv6

Configuring IPv6 Addressing and Enabling IPv6 Routing, page 976

Configuring Default Router Preference, page 979

Configuring IPv4 and IPv6 Protocol Stacks, page 980

Configuring DHCP for IPv6 Address Assignment, page 982

Configuring IPv6 ICMP Rate Limiting, page 985

Configuring CEF for IPv6, page 986

Configuring Static Routing for IPv6, page 986

Configuring RIP for IPv6, page 988

Configuring OSPF for IPv6, page 990

Configuring EIGRP for IPv6, page 992

Configuring BGP for IPv6, page 992

Configuring IPv6 Addressing and Enabling IPv6 Routing

To forward IPv6 traffic on an interface, you must configure a global IPv6 address on that interface. Configuring an IPv6

address on an interface automatically configures a link-local address and activates IPv6 for the interface. The configured

interface automatically joins these required multicast groups for that link:

solicited-node multicast group FF02:0:0:0:0:1:ff00::/104 for each unicast address assigned to the interface (the

address for the neighbor discovery process)

all-nodes link-local multicast group FF02::1

all-routers link-local multicast group FF02::2

For more information about configuring IPv6 routing, see the “Implementing Addressing and Basic Connectivity for IPv6”

chapter in the IPv6 Implementation Guide, Cisco IOS Release 15.2M&T.

BEFORE YOU BEGIN

Be sure to select a dual IPv4 and IPv6 SDM template.

Not all features discussed in this chapter are supported by the switch. See Unsupported IPv6 Unicast Routing

Features, page 974.

976

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

sdm prefer dual-ipv4-and-ipv6 {default |

Select an SDM template that supports IPv4 and IPv6.

routing | vlan}

default—Set the switch to the default template to

balance system resources.

routing—Set the switch to the routing template to

support IPv4 and IPv6 routing, including IPv4

policy-based routing.

vlan—Maximize VLAN configuration on the switch

with no routing supported in hardware.

end

Return to privileged EXEC mode.

reload

Reload the operating system.

configure terminal

Enter global configuration mode.

interface interface-id

Enter interface configuration mode, and specify the

Layer 3 interface to configure. The interface can be a

physical interface, a switch virtual interface (SVI), or a

Layer 3 EtherChannel.

no switchport

Remove the interface from Layer 2 configuration mode

(if it is a physical interface).

ipv6 address ipv6-prefix/prefix length

Specify a global IPv6 address with an extended unique

eui-64

identifier (EUI) in the low-order 64 bits of the IPv6

address. Specify only the network prefix; the last 64 bits

are automatically computed from the switch MAC

address. This enables IPv6 processing on the interface.

Specify a link-local address on the interface to be used

instead of the link-local address that is automatically

configured when IPv6 is enabled on the interface. This

ipv6 address ipv6-address link-local

command enables IPv6 processing on the interface.

Automatically configure an IPv6 link-local address on

the interface, and enable the interface for IPv6

processing. The link-local address can only be used to

ipv6 enable

communicate with nodes on the same link.

exit

Return to global configuration mode.

10.

ip routing

Enable IP routing on the switch.

11.

ipv6 unicast-routing

Enable forwarding of IPv6 unicast data packets.

12.

end

Return to privileged EXEC mode.

13.

show ipv6 interface interface-id

Verify your entries.

14.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To remove an IPv6 address from an interface, use the no ipv6 address ipv6-prefix/prefix length eui-64 or no ipv6

address ipv6-address link-local interface configuration command. To remove all manually configured IPv6 addresses

from an interface, use the no ipv6 address interface configuration command without arguments. To disable IPv6

processing on an interface that has not been explicitly configured with an IPv6 address, use the no ipv6 enable interface

configuration command. To globally disable IPv6 routing, use the no ipv6 unicast-routing global configuration

command.

978

Configuring IPv6 Unicast Routing

Configuring IPv6

EXAMPLE

This example shows how to enable IPv6 with both a link-local address and a global address based on the IPv6 prefix

2001:0DB8:c18:1::/64. The EUI-64 interface ID is used in the low-order 64 bits of both addresses. Output from the show

ipv6 interface EXEC command is included to show how the interface ID (20B:46FF:FE2F:D940) is appended to the

link-local prefix FE80::/64 of the interface.

Switch(config)# sdm prefer dual-ipv4-and-ipv6 default

Switch(config)# ipv6 unicast-routing

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# no switchport

Switch(config-if)# ipv6 address 2001:0DB8:c18:1::/64 eui 64

Switch(config-if)# end

Switch# show ipv6 interface gigabitethernet0/11

GigabitEthernet0/2 is up, line protocol is up

IPv6 is enabled, link-local address is FE80::20B:46FF:FE2F:D940

Global unicast address(es):

2001:0DB8:c18:1:20B:46FF:FE2F:D940, subnet is 2001:0DB8:c18:1::/64 [EUI]

Joined group address(es):

FF02::1

FF02::2

FF02::1:FF2F:D940

MTU is 1500 bytes

ICMP error messages limited to one every 100 milliseconds

ICMP redirects are enabled

ND DAD is enabled, number of DAD attempts: 1

ND reachable time is 30000 milliseconds

ND advertised reachable time is 0 milliseconds

ND advertised retransmit interval is 0 milliseconds

ND router advertisements are sent every 200 seconds

ND router advertisements live for 1800 seconds

Hosts use stateless autoconfig for addresses.

Configuring Default Router Preference

Router advertisement messages are sent with the default router preference (DRP) configured by the ipv6 nd

router-preference interface configuration command. If no DRP is configured, router advertisements are sent with a

medium preference.

A DRP is useful when two routers on a link might provide equivalent, but not equal-cost routing, and policy might dictate

that hosts should prefer one of the routers.

BEFORE YOU BEGIN

Complete the Configuring IPv6 Addressing and Enabling IPv6 Routing, page 976.

979

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

interface interface-id

Enter interface configuration mode, and enter the Layer 3

interface on which you want to specify the DRP.

ipv6 nd router-preference {high |

Specify a DRP for the router on the switch interface.

medium | low}

end

Return to privileged EXEC mode.

show ipv6 interface

Verify the configuration.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

Use the no ipv6 nd router-preference interface configuration command to disable an IPv6 DRP.

EXAMPLE

This example shows how to configure a DRP of high for the router on an interface:

Switch# configure terminal

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# ipv6 nd router-preference high

Switch(config-if)# end

Configuring IPv4 and IPv6 Protocol Stacks

Follow this procedure to configure a Layer 3 interface to support both IPv4 and IPv6 and to enable IPv6 routing.

BEFORE YOU BEGIN

Before configuring IPv6 routing, you must select an SDM template that supports IPv4 and IPv6. If not already configured,

use the sdm prefer dual-ipv4-and-ipv6 {default | routing | vlan} global configuration command to configure a template

that supports IPv6. When you select a new template, you must reload the switch by using the reload privileged EXEC

command so that the template takes effect.

980

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

sdm prefer dual-ipv4-and-ipv6 {default |

Select an SDM template that supports IPv4 and IPv6.

routing | vlan}

default—Set the switch to the default template to

balance system resources.

routing—Set the switch to the routing template to

support IPv4 and IPv6 routing, including IPv4

policy-based routing.

vlan—Maximize VLAN configuration on the switch

with no routing supported in hardware.

end

Return to privileged EXEC mode.

reload

Reload the operating system.

configure terminal

Enter global configuration mode.

ip routing

Enable IPv4 routing on the switch.

ipv6 unicast-routing

Enable forwarding of IPv6 data packets on the switch.

interface interface-id

Enter interface configuration mode, and specify the

Layer 3 interface to configure.

no switchport

Remove the interface from Layer 2 configuration mode

(if it is a physical interface).

10.

ip address ip-address mask [secondary]

Specify a primary or secondary IPv4 address for the

interface.

11.

ipv6 address ipv6-prefix/prefix length

Specify a global IPv6 address. Specify only the network

eui-64

prefix; the last 64 bits are automatically computed from

the switch MAC address.

Specify a link-local address on the interface to be used

instead of the automatically configured link-local

address when IPv6 is enabled on the interface.

ipv6 address ipv6-address link-local

Automatically configure an IPv6 link-local address on

the interface, and enable the interface for IPv6

processing. The link-local address can only be used to

ipv6 enable

communicate with nodes on the same link.

12.

end

Return to privileged EXEC mode.

13.

show interface interface-id

Verify your entries.

show ip interface interface-id

show ipv6 interface interface-id

14.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable IPv4 routing, use the no ip routing global configuration command. To disable IPv6 routing, use the no ipv6

unicast-routing global configuration command. To remove an IPv4 address from an interface, use the no ip address

ip-address mask interface configuration command. To remove an IPv6 address from an interface, use the no ipv6

address ipv6-prefix/prefix length eui-64 or no ipv6 address ipv6-address link-local interface configuration command.

981

Configuring IPv6 Unicast Routing

Configuring IPv6

To remove all manually configured IPv6 addresses from an interface, use the no ipv6 address interface configuration

command without arguments. To disable IPv6 processing on an interface that has not been explicitly configured with an

IPv6 address, use the no ipv6 enable interface configuration command.

EXAMPLE

This example shows how to enable IPv4 and IPv6 routing on an interface:

Switch(config)# sdm prefer dual-ipv4-and-ipv6 default

Switch(config)# ip routing

Switch(config)# ipv6 unicast-routing

Switch(config)# interface gigabitethernet0/2

Switch(config-if)# no switchport

Switch(config-if)# ip address 192.168.99.1 244.244.244.0

Switch(config-if)# ipv6 address 2001:0DB8:c18:1::/64 eui 64

Switch(config-if)# end

Configuring DHCP for IPv6 Address Assignment

This document describes only the DHCPv6 address assignment. For more information about configuring the DHCPv6

client, server, or relay agent functions, see the “Implementing DHCP for IPv6” chapter in the IPv6 Implementation Guide,

Cisco IOS Release 15.2M&T.

Default DHCPv6 Address Assignment Configuration, page 982

DHCPv6 Address Assignment Configuration Guidelines, page 982

Enabling the DHCPv6 Server Function, page 982

Enabling the DHCPv6 Client Function, page 985

Default DHCPv6 Address Assignment Configuration

By default, no Dynamic Host Configuration Protocol for IPv6 (DHCPv6) features are configured on the switch.

DHCPv6 Address Assignment Configuration Guidelines

When configuring a DHCPv6 address assignment, consider these guidelines:

In the procedures, the specified interface must be one of these Layer 3 interfaces:

— DHCPv6 IPv6 routing must be enabled on a Layer 3 interface.

— SVI: a VLAN interface created by using the interface vlan vlan_id command.

— EtherChannel port channel in Layer 3 mode: a port-channel logical interface created by using the interface

port-channel port-channel-number command.

Before configuring DHCPv6, you must select a Switch Database Management (SDM) template that supports IPv4

and IPv6.

The switch can act as a DHCPv6 client, server, or relay agent. The DHCPv6 client, server, and relay function are

mutually exclusive on an interface.

Enabling the DHCPv6 Server Function

BEFORE YOU BEGIN

See DHCPv6 Address Assignment Configuration Guidelines, page 982.

982

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

ipv6 dhcp pool poolname

Enter DHCP pool configuration mode, and define the

name for the IPv6 DHCP pool. The pool name can be

a symbolic string (such as Engineering) or an integer

(such as 0).

address prefix IPv6-prefix lifetime {t1 t1 |

(Optional) Specify an address prefix for address

infinite}

assignment.

This address must be in hexadecimal, using 16-bit

values between colons.

lifetime t1 t1—Specify a time interval (in

seconds) that an IPv6 address prefix remains in

the valid state. The range is 5 to 4294967295

seconds. Specify infinite for no time interval.

link-address IPv6-prefix

(Optional) Specify a link-address IPv6 prefix.

When an address on the incoming interface or a

link-address in the packet matches the specified IPv6

prefix, the server uses the configuration information

pool.

This address must be in hexadecimal, using 16-bit

values between colons.

vendor-specific vendor-id

(Optional) Enter vendor-specific configuration mode,

and enter a vendor-specific identification number.

This number is the vendor IANA Private Enterprise

Number. The range is 1 to 4294967295.

suboption number {address IPv6-address |

(Optional) Enter a vendor-specific suboption number.

ascii ASCII-string | hex hex-string}

The range is 1 to 65535. Enter an IPv6 address, ASCII

text, or a hex string as defined by the suboption

parameters.

exit

Return to DHCP pool configuration mode.

exit

Return to global configuration mode.

interface interface-id

Enter interface configuration mode, and specify the

interface to configure.

983

Configuring IPv6 Unicast Routing

Configuring IPv6

Command

Purpose

10.

ipv6 dhcp server [poolname | automatic]

Enable the DHCPv6 server function on an interface.

[rapid-commit] [preference value]

[allow-hint]

poolname—(Optional) User-defined name for the

IPv6 DHCP pool. The pool name can be a

symbolic string (such as Engineering) or an

integer (such as 0).

automatic—(Optional) Enables the system to

automatically determine which pool to use when

allocating addresses for a client.

rapid-commit—(Optional) Allow two-message

exchange method.

preference value—(Optional) The preference

value carried in the preference option in the

advertise message sent by the server. The range

is from 0 to 255. The preference value default is

allow-hint—(Optional) Specifies whether the

server should consider client suggestions in the

SOLICIT message. By default, the server ignores

client hints.

11.

end

Return to privileged EXEC mode.

12.

show ipv6 dhcp pool

Verify DHCPv6 pool configuration.

show ipv6 dhcp interface

Verify that the DHCPv6 server function is enabled on

an interface.

13.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To delete a DHCPv6 pool, use the no ipv6 dhcp pool poolname global configuration command. Use the no form of the

DHCP pool configuration mode commands to change the DHCPv6 pool characteristics. To disable the DHCPv6 server

function on an interface, use the no ipv6 dhcp server interface configuration command.

EXAMPLE

This example shows how to configure a pool called engineering with an IPv6 address prefix:

Switch# configure terminal

Switch(config)# ipv6 dhcp pool engineering

Switch(config-dhcpv6)#address prefix 2001:1000::0/64

Switch(config-dhcpv6)# end

This example shows how to configure a pool called testgroup with three link-addresses and an IPv6 address prefix:

Switch# configure terminal

Switch(config)# ipv6 dhcp pool testgroup

Switch(config-dhcpv6)# link-address 2001:1001::0/64

Switch(config-dhcpv6)# link-address 2001:1002::0/64

Switch(config-dhcpv6)# link-address 2001:2000::0/48

Switch(config-dhcpv6)# address prefix 2001:1003::0/64

Switch(config-dhcpv6)# end

This example shows how to configure a pool called 350 with vendor-specific options:

984

Configuring IPv6 Unicast Routing

Configuring IPv6

Switch# configure terminal

Switch(config)# ipv6 dhcp pool 350

Switch(config-dhcpv6)# address prefix 2001:1005::0/48

Switch(config-dhcpv6)# vendor-specific 9

Switch(config-dhcpv6-vs)# suboption 1 address 1000:235D::1

Switch(config-dhcpv6-vs)# suboption 2 ascii "IP-Phone"

Switch(config-dhcpv6-vs)# end

Enabling the DHCPv6 Client Function

BEFORE YOU BEGIN

See DHCPv6 Address Assignment Configuration Guidelines, page 982.

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

interface interface-id

Enter interface configuration mode, and specify the

interface to configure.

ipv6 address dhcp [rapid-commit]

Enable the interface to acquire an IPv6 address from

the DHCPv6 server.

rapid-commit—(Optional) Allow two-message

exchange method for address assignment.

ipv6 dhcp client request [vendor-specific]

(Optional) Enable the interface to request the

vendor-specific option.

end

Return to privileged EXEC mode.

show ipv6 dhcp interface

Verify that the DHCPv6 client is enabled on an

interface.

To disable the DHCPv6 client function, use the no ipv6 address dhcp interface configuration command. To remove the

DHCPv6 client request, use the no ipv6 address dhcp client request interface configuration command.

EXAMPLE

This example shows how to acquire an IPv6 address and to enable the rapid-commit option:

Switch(config)# interface gigabitethernet0/1

Switch(config-if)# ipv6 address dhcp rapid-commit

Configuring IPv6 ICMP Rate Limiting

ICMP rate limiting is enabled by default with a default interval between error messages of 100 milliseconds and a bucket

size (maximum number of tokens to be stored in a bucket) of 10.

BEFORE YOU BEGIN

Complete the Configuring IPv6 Addressing and Enabling IPv6 Routing, page 976.

985

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

ipv6 icmp error-interval interval

Configure the interval and bucket size for IPv6 ICMP

[bucketsize]

error messages:

interval—The interval (in milliseconds) between

tokens being added to the bucket. The range is from

0 to 2147483647 milliseconds.

bucketsize—(Optional) The maximum number of

tokens stored in the bucket. The range is from 1 to

200.

end

Return to privileged EXEC mode.

show ipv6 interface [interface-id]

Verify your entries.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To return to the default configuration, use the no ipv6 icmp error-interval global configuration command.

EXAMPLE

This example shows how to configure an IPv6 ICMP error message interval of 50 milliseconds and a bucket size of 20

tokens:

Switch(config)#ipv6 icmp error-interval 50 20

Configuring CEF for IPv6

Cisco Express Forwarding (CEF) is a Layer 3 IP switching technology, allowing more CPU processing power to be

dedicated to packet forwarding. IPv4 CEF is enabled by default. IPv6 CEF is disabled by default, but automatically

enabled when you configure IPv6 routing.

To route IPv6 unicast packets, first globally configure forwarding of IPv6 unicast packets by using the ipv6

unicast-routing global configuration command. You must also configure an IPv6 address and IPv6 processing on an

interface by using the ipv6 address interface configuration command.

To disable IPv6 CEF, use the no ipv6 cef global configuration command. To reenable IPv6 CEF, use the ipv6 cef global

configuration command. You can verify the IPv6 state by entering the show ipv6 cef privileged EXEC command.

For more information about configuring CEF, see the “Implementing IPv6 Addressing and Basic Connectivity” chapter in

the IPv6 Implementation Guide, Cisco IOS Release 15.2M&T.

Configuring Static Routing for IPv6

BEFORE YOU BEGIN

Before configuring a static IPv6 route, you must:

Enable routing by using the ip routing global configuration command.

Enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command.

Enable IPv6 on at least one Layer 3 interface by configuring an IPv6 address on the interface.

986

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

ipv6 route ipv6-prefix/prefix

Configure a static IPv6 route.

length {ipv6-address |

interface-id [ipv6-address]}

ipv6-prefix—The IPv6 network that is the destination of the

[administrative distance]

static route. It can also be a hostname when static host routes

are configured.

/prefix length—The length of the IPv6 prefix. A decimal value

that shows how many of the high-order contiguous bits

comprise the prefix (the network portion of the address). A

slash mark must precede the decimal value.

ipv6-address—The IPv6 address of the next hop that can be

used to reach the specified network. The next hop does not

need to be directly connected; recursion finds the IPv6

address of the directly connected next hop. The address

must be specified in hexadecimal using 16-bit values

between colons.

interface-id—Specify direct static routes from point-to-point

and broadcast interfaces. On point-to-point interfaces, you

do not need to specify the IPv6 address of the next hop. On

broadcast interfaces, you should always specify the IPv6

address of the next hop, or ensure that the specified prefix is

assigned to the link, specifying a link-local address as the

next hop. You can optionally specify the IPv6 address of the

next hop to which packets are sent.

Note: You must specify an interface-id when using a link-local

address as the next hop. The link-local next hop must be an

adjacent router.

administrative distance—(Optional) An administrative

distance. The range is 1 to 254; the default value is 1, which

gives static routes precedence over all but connected routes.

To configure a floating static route, use an administrative

distance greater than that of the dynamic routing protocol.

987

Configuring IPv6 Unicast Routing

Configuring IPv6

Command

Purpose

end

Return to privileged EXEC mode.

show ipv6 static [ipv6-address |

Verify your entries by displaying the IPv6 routing table.

ipv6-prefix/prefix length]

[interface interface-id]

interface interface-id—(Optional) Display only those static

[recursive] [detail]

routes with the specified interface as an egress interface.

recursive—(Optional) Display only recursive static routes. The

recursive keyword is mutually exclusive with the interface

keyword, but it can be used with or without the IPv6 prefix in

the command syntax.

detail—(Optional) Display this additional information:

show ipv6 route static [updated]

— For valid recursive routes, the output path set, and

maximum resolution depth.

— For invalid routes, the reason why the route is not valid.

copy running-config

(Optional) Save your entries in the configuration file.

startup-config

To remove a configured static route, use the no ipv6 route ipv6-prefix/prefix length {ipv6-address | interface-id

[ipv6-address]} [administrative distance] global configuration command.

For more information about configuring static IPv6 routing, see the “Implementing Static Routes for IPv6” chapter in the

IPv6 Implementation Guide, Cisco IOS Release 15.2M&T.

EXAMPLE

This example shows how to configure a floating static route to an interface. The route has an administrative distance of

130:

Switch(config)# ipv6 route 2001:0DB8::/32 gigabitethernet0/1 130

Configuring RIP for IPv6

BEFORE YOU BEGIN

Before configuring the switch to run IPv6 RIP, you must:

Enable routing by using the ip routing global configuration command.

Enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command.

Enable IPv6 on any Layer 3 interfaces on which IPv6 RIP is to be enabled.

988

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

ipv6 router rip name

Configure an IPv6 RIP routing process, and enter router

configuration mode for the process.

maximum-paths number-paths

(Optional) Define the maximum number of equal-cost

routes that IPv6 RIP can support. The range is from 1 to

64, and the default is 4 routes.

exit

Return to global configuration mode.

interface interface-id

Enter interface configuration mode, and specify the

Layer 3 interface to configure.

ipv6 rip name enable

Enable the specified IPv6 RIP routing process on the

interface.

ipv6 rip name default-information {only |

(Optional) Originate the IPv6 default route (::/0) into the

originate}

RIP routing process updates sent from the specified

interface.

Note: To avoid routing loops after the IPv6 default route

(::/0) is originated from any interface, the routing

process ignores all default routes received on any

interface.

only—Select to originate the default route, but

suppress all other routes in the updates sent on this

interface.

originate—Select to originate the default route in

addition to all other routes in the updates sent on

this interface.

end

Return to privileged EXEC mode.

show ipv6 rip [name] [interface

Display information about current IPv6 RIP processes.

interface-id] [database] [next-hops]

show ipv6 route rip [updated]

Display the current contents of the IPv6 routing table.

10.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable a RIP routing process, use the no ipv6 router rip name global configuration command. To disable the RIP

routing process for an interface, use the no ipv6 rip name interface configuration command.

For more information about configuring RIP routing for IPv6, see the “Implementing RIP for IPv6” chapter in the IPv6

Implementation Guide, Cisco IOS Release 15.2M&T.

EXAMPLE

This example shows how to enable the RIP routing process cisco with a maximum of eight equal-cost routes and to

enable it on an interface:

Switch(config)# ipv6 router rip cisco

Switch(config-router)# maximum-paths 8

Switch(config)# exit

Switch(config)# interface gigabitethernet0/3

989

Configuring IPv6 Unicast Routing

Configuring IPv6

Switch(config-if)# ipv6 rip cisco enable

Configuring OSPF for IPv6

You can customize OSPF for IPv6 for your network. However, the defaults are set to meet the requirements of most

customers and features.

Be careful when changing the defaults for IPv6 commands. Doing so might adversely affect OSPF for the IPv6 network.

BEFORE YOU BEGIN

Before you enable IPv6 OSPF on an interface, you must:

Enable routing by using the ip routing global configuration command.

Enable the forwarding of IPv6 packets by using the ipv6 unicast-routing global configuration command.

Enable IPv6 on Layer 3 interfaces on which you are enabling IPv6 OSPF.

990

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

ipv6 router ospf process-id

Enable OSPF router configuration mode for the process.

The process ID is the number assigned administratively

when enabling the OSPF for IPv6 routing process. It is

locally assigned and can be a positive integer from 1 to

65535.

area area-id range {ipv6-prefix/prefix

(Optional) Consolidate and summarize routes at an area

length} [advertise | not-advertise] [cost

boundary.

cost]

area-id—Identifier of the area about which routes

are to be summarized. It can be specified as either

a decimal value or as an IPv6 prefix.

ipv6-prefix/prefix length—The destination IPv6

network and a decimal value that shows how many

of the high-order contiguous bits of the address

comprise the prefix (the network portion of the

address). A slash mark (/) must precede the

decimal value.

advertise—(Optional) Set the address range status

to advertise and to generate a Type 3 summary

link-state advertisement (LSA).

not-advertise—(Optional) Set the address range

status to DoNotAdvertise. The Type 3 summary LSA

is suppressed, and component networks remain

hidden from other networks.

cost cost—(Optional) Metric or cost for this

summary route, which is used during OSPF SPF

calculation to determine the shortest paths to the

destination. The value can be 0 to 16777215.

maximum paths number-paths

(Optional) Define the maximum number of equal-cost

routes to the same destination that IPv6 OSPF should

enter in the routing table. The range is from 1 to 64, and

the default is 16 paths.

exit

Return to global configuration mode.

interface interface-id

Enter interface configuration mode, and specify the

Layer 3 interface to configure.

ipv6 ospf process-id area area-id

Enable OSPF for IPv6 on the interface.

[instance instance-id]

instance instance-id—(Optional) Instance identifier.

991

Configuring IPv6 Unicast Routing

Configuring IPv6

Command

Purpose

end

Return to privileged EXEC mode.

show ipv6 ospf [process-id] [area-id]

Display information about OSPF interfaces.

interface [interface-id]

show ipv6 ospf [process-id] [area-id]

Display general information about OSPF routing

processes.

10.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

To disable an OSPF routing process, use the no ipv6 router ospf process-id global configuration command. To disable

the OSPF routing process for an interface, use the no ipv6 ospf process-id area area-id interface configuration

command.

For more information about configuring OSPF routing for IPv6, see the “Implementing OSPF for IPv6” chapter in the IPv6

Implementation Guide, Cisco IOS Release 15.2M&T.

Configuring EIGRP for IPv6

By default, EIGRP for IPv6 is disabled. You can configure EIGRP for IPv6 on an interface. After configuring the router and

the interface for EIGRP, enter the no shutdown privileged EXEC command to start EIGRP.

Note: If EIGRP for IPv6 is not in shutdown mode, EIGRP might start running before you enter the EIRGP router-mode

commands to configure the router and the interface.

To set an explicit router ID, use the show ipv6 eigrp command to see the configured router IDs, and then use the

router-id command.

As with EIGRP IPv4, you can use EIGRPv6 to specify your EIGRP IPv4 interfaces and to select a subset of those as passive

interfaces. Use the passive-interface default command to make all interfaces passive, and then use the no

passive-interface command on selected interfaces to make them active. EIGRP IPv6 does not need to be configured

on a passive interface.

For more configuration procedures, see the “Implementing EIGRP for IPv6” chapter in the IPv6 Implementation Guide,

Cisco IOS Release 15.2M&T.

Configuring BGP for IPv6

When configuring multiprotocol BGP extensions for IPv6, you must create the BGP routing process, configure peering

relationships, and customize BGP for your particular network. Note that BGP functions the same in IPv6 as in IPv4.

BEFORE YOU BEGIN

Before configuring the router to run BGP for IPv6, you must use the ipv6 unicast-routing command to globally enable

IPv6 routing.

992

Configuring IPv6 Unicast Routing

Configuring IPv6

DETAILED STEPS

Command

Purpose

configure terminal

Enter global configuration mode.

router bgp as-number

Configure a BGP routing process, and enter BGP router

configuration mode for the autonomous system number.

no bgp default ipv4-unicast

Disable the IPv4 unicast address family for the BGP

routing process specified in the previous step.

Routing information for the IPv4 unicast address family

is advertised by default for each BGP routing session

unless you enter this command before configuring the

neighbor remote-as command.

bgp router-id ip-address

(Optional) Configure a fixed 32-bit router ID as the

identifier of the local router running BGP. By default, the

router ID is the IPv4 address of a router loopback

interface. On a router enabled only for IPv6 (no IPv4

address), you must manually configure the BGP router

ID.

Note: Configuring a router ID by using this command

resets all active BGP peering sessions.

neighbor {ip-address | ipv6-address[%]

Add the IPv6 address of the neighbor in the specified

interface-type interface-number |

autonomous system to the IPv6 multiprotocol BGP

peer-group-name} remote-as as-number

neighbor table of the local router.

Note: The ipv6-address must be in hexadecimal, using

16-bit values between colons.

address-family ipv6

Specify the IPv6 address family and enter address family

configuration mode

neighbor {ip-address | peer-group-name |

Enable the neighbor to exchange prefixes for the IPv6

ipv6-address} activate

address family with the local router.

end

Return to privileged EXEC mode.

show bgp ipv6

Display information about IPv6 BGP configuration.

10.

copy running-config startup-config

(Optional) Save your entries in the configuration file.

For more configuration procedures, see the “Implementing Multiprotocol BGP for IPv6” chapter in the IPv6

Implementation Guide, Cisco IOS Release 15.2M&T.

The switch does not support multicast IPv6 BGP, nonstop forwarding (NSF) for IPv6 BGP, 6PE multipath (EoMPLS), or

IPv6 VRF.

EXAMPLE

router bgp 1

bgp router-id 1.1.1.1

no bgp default ipv4-unicast

!--- Without configuring ""no bgp default ipv4-unicast"" only IPv4 will be

!--- advertised

bgp log-neighbor-changes

neighbor 2010:AB8:0:2:C601:10FF:FE58:0 remote-as 2

address-family ipv6

neighbor 2010:AB8:0:2:C601:10FF:FE58:0 activate

993

Configuring IPv6 Unicast Routing

Verifying Configuration

Command

Purpose

show bgp ipv6

Display BGP IPv6 configuration and routing tables.

show ipv6 access-list

Display IPv6 access lists.

show ipv6 cef

Display Cisco Express Forwarding for IPv6.

show ipv6 interface interface-id

Display IPv6 interface status and configuration.

show ipv6 mtu

Display IPv6 MTU per destination cache.

show ipv6 neighbors

Display IPv6 neighbor cache entries.

show ipv6 ospf

Display IPv6 OSPF information.

show ipv6 prefix-list

Display IPv6 prefix lists.

show ipv6 protocols

Display IPv6 routing protocols on the switch.

show ipv6 rip

Display IPv6 RIP routing protocol status.

show ipv6 route

Display IPv6 route table entries.

show ipv6 routers

Display local IPv6 routers.

show ipv6 static

Display IPv6 static routes.

show ipv6 traffic

Display IPv6 traffic statistics.

Command

Purpose

show ipv6 eigrp [as-number] interface

Display information about interfaces configured for EIGRP IPv6.

show ipv6 eigrp [as-number] neighbor

Display the neighbors discovered by EIGRP IPv6.

show ipv6 eigrp [as-number] traffic

Display the number of EIGRP IPv6 packets sent and received.

show ipv6 eigrp topology [as-number |

Display EIGRP entries in the IPv6 topology table.

ipv6-address] [active | all-links | detail-links |

pending | summary | zero-successors]

Command

Purpose

show ip http server history

Display the previous 20 connections to the HTTP server, including the

IP address accessed and the time when the connection was closed.

show ip http server connection

Display the current connections to the HTTP server, including the local

and remote IP addresses being accessed.

show ip http client connection

Display the configuration values for HTTP client connections to HTTP

servers.

show ip http client history

Display a list of the last 20 requests made by the HTTP client to the

server.

Configuration Example

This is an example of the output from the show ipv6 interface privileged EXEC command:

Switch# show ipv6 interface

Vlan1 is up, line protocol is up

995

Configuring IPv6 Unicast Routing

Configuration Example

IPv6 is enabled, link-local address is FE80::20B:46FF:FE2F:D940

Global unicast address(es):

3FFE:C000:0:1:20B:46FF:FE2F:D940, subnet is 3FFE:C000:0:1::/64 [EUI]

Joined group address(es):

FF02::1

FF02::2

FF02::1:FF2F:D940

MTU is 1500 bytes

ICMP error messages limited to one every 100 milliseconds

ICMP redirects are enabled

ND DAD is enabled, number of DAD attempts: 1

ND reachable time is 30000 milliseconds

ND advertised reachable time is 0 milliseconds

ND advertised retransmit interval is 0 milliseconds

ND router advertisements are sent every 200 seconds

ND router advertisements live for 1800 seconds

This is an example of the output from the show ipv6 cef privileged EXEC command:

Switch# show ipv6 cef

::/0

nexthop 3FFE:C000:0:7::777 Vlan7

3FFE:C000:0:1::/64

attached to Vlan1

3FFE:C000:0:1:20B:46FF:FE2F:D940/128

receive

3FFE:C000:0:7::/64

attached to Vlan7

3FFE:C000:0:7::777/128

attached to Vlan7

3FFE:C000:0:7:20B:46FF:FE2F:D97F/128

receive

3FFE:C000:111:1::/64

attached to GigabitEthernet0/11

3FFE:C000:111:1:20B:46FF:FE2F:D945/128

receive

3FFE:C000:168:1::/64

attached to GigabitEthernet0/43

3FFE:C000:168:1:20B:46FF:FE2F:D94B/128

receive

3FFE:C000:16A:1::/64

attached to Loopback10

3FFE:C000:16A:1:20B:46FF:FE2F:D900/128

receive

This is an example of the output from the show ipv6 protocols privileged EXEC command:

Switch# show ipv6 protocols

IPv6 Routing Protocol is “connected”

IPv6 Routing Protocol is “static”

IPv6 Routing Protocol is “rip fer”

Interfaces:

Vlan6

GigabitEthernet0/4

GigabitEthernet0/11

GigabitEthernet0/12

Redistribution:

None

This is an example of the output from the show ipv6 rip privileged EXEC command:

Switch# show ipv6 rip

996

Cisco Industrial Ethernet 4000, 4010 and 5000 Switch Software. Configuration Guide (2022) - page 35