Configuring IPv6 Unicast-Routing

Overview

Function Introduction

Static routing is a concept describing one way of configuring path selection of routers in computer networks. It is the type of routing characterized by the absence of communication between routers regarding the current topology of the network. This is achieved by manually adding routes to the routing table. The opposite of static routing is dynamic routing, sometimes also referred to as adaptive routing.

In these systems, routes through a data network are described by fixed paths (statically). These routes are usually entered into the router by the system administrator. An entire network can be configured using static routes, but this type of configuration is not fault tolerant. When there is a change in the network or a failure occurs between two statically defined nodes, traffic will not be rerouted. This means that anything that wishes to take an affected path will either have to wait for the failure to be repaired or the static route to be updated by the administrator before restarting its journey. Most requests will time out (ultimately failing) before these repairs can be made. There are, however, times when static routes can improve the performance of a network. Some of these include stub networks and default routes.

Principle Description

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Configuration

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  1. ipv6 unicast routing

The following example shows how to deploy static routes in a simple environment.

The following configuration should be operated on all switches if the switch ID is not specified.

step 1 Enter the configure mode

Switch# configure terminal

step 2 Enable ipv6 globally

Switch(config)# ipv6 enable

step 3 Enter the interface configure mode and set the attributes of the interface

Interface configuration for Switch1:

Switch(config)# interface eth-0-9
Switch(config-if)# no switchport
Switch(config-if)# no shutdown
Switch(config-if)# ipv6 address auto link-local
Switch(config-if)# ipv6 address 2001:1::1/64
Switch(config-if)# exit

Interface configuration for Switch2:

Switch(config)# interface eth-0-9
Switch(config-if)# no switchport
Switch(config-if)# no shutdown
Switch(config-if)# ipv6 address auto link-local
Switch(config-if)# ipv6 address 2001:1::2/64
Switch(config-if)# exit
Switch(config)# interface eth-0-17
Switch(config-if)# no switchport
Switch(config-if)# no shutdown
Switch(config-if)# ipv6 address auto link-local
Switch(config-if)# ipv6 address 2001:2::2/64
Switch(config-if)# exit

Interface configuration for Switch3:

Switch(config)# interface eth-0-17
Switch(config-if)# no switchport
Switch(config-if)# no shutdown
Switch(config-if)# ipv6 address auto link-local
Switch(config-if)# ipv6 address 2001:2::3/64
Switch(config-if)# exit

step 4 Create static routes

Configuring Switch1:

Switch(config)# ipv6 route 2001:2::/64 2001:1::2

Configuring Switch3:

Switch(config)# ipv6 route 2001:1::/64 2001:2::2

step 5 Exit the configure mode

Switch(config)# end

step 6 Validation

Display the result on Switch1:

Switch# show ipv6 route
IPv6 Routing Table
Codes: C - connected, S - static, R - RIP, O - OSPF, I - IS-IS, B -

BGP | [*] - [AD/Metric]

Timers: Uptime
C 2001:1::/64
via ::, eth-0-9, 02:08:50
C 2001:1::1/128
via ::1, eth-0-9, 02:08:50
S 2001:2::/64 \[1/0\]
via 2001:1::2, eth-0-9, 02:05:36
C fe80::/10
via ::, Null0, 02:09:11

Display the result on Switch2:

Switch# show ipv6 route
IPv6 Routing Table
Codes: C - connected, S - static, R - RIP, O - OSPF, I - IS-IS, B -

BGP | [*] - [AD/Metric]

Timers: Uptime
C 2001:1::/64
via ::, eth-0-9, 00:03:37
C 2001:1::2/128
via ::1, eth-0-9, 00:03:37
C 2001:2::/64
via ::, eth-0-17, 00:03:21
C 2001:2::2/128
via ::1, eth-0-17, 00:03:21
C fe80::/10
via ::, Null0, 00:03:44

Display the result on Switch3:

Switch# show ipv6 route
IPv6 Routing Table
Codes: C - connected, S - static, R - RIP, O - OSPF, I - IS-IS, B -

BGP | [*] - [AD/Metric]

Timers: Uptime
S 2001:1::/64 \[1/0\]
via 2001:2::2, eth-0-17, 00:02:14
C 2001:2::/64
via ::, eth-0-17, 00:03:28
C 2001:2::3/128
via ::1, eth-0-17, 00:03:28
C fe80::/10
via ::, Null0, 00:03:53

Use the “ping” command on switch1 to contact the switch3:

Switch1 ping ipv6 2001:2::3
PING 2001:2::3(2001:2::3) 56 data bytes
64 bytes from 2001:2::3: icmp_seq=0 ttl=63 time=127 ms
64 bytes from 2001:2::3: icmp_seq=1 ttl=63 time=132 ms
64 bytes from 2001:2::3: icmp_seq=2 ttl=63 time=124 ms
64 bytes from 2001:2::3: icmp_seq=3 ttl=63 time=137 ms
64 bytes from 2001:2::3: icmp_seq=4 ttl=63 time=141 ms

| — 2001:2::3 ping statistics —

5 packets transmitted, 5 received, 0% packet loss, time 4010ms
rtt min/avg/max/mdev = 124.950/132.719/141.251/5.923 ms, pipe 2

Application cases {application-cases-89}

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