Contents

Introduction· 1

Prerequisites· 1

Example: Configuring IPv6 IS-IS·· 1

Network configuration· 1

Analysis· 2

Procedures· 2

Configuring Router A· 2

Configuring Router B· 3

Configuring Router C· 3

Configuring Router D·· 4

Configuring Router E· 5

Verifying the configuration· 5

Configuration files· 7

Related documentation· 9

 

Introduction

This document provides IPv6 IS-IS configuration examples.

Prerequisites

The configuration examples in this document were created and verified in a lab environment, and all the devices were started with the factory default configuration. When you are working on a live network, make sure you understand the potential impact of every command on your network.

This document assumes that you have basic knowledge of IPv6 IS-IS.

Example: Configuring IPv6 IS-IS

Network configuration

As shown in Figure 1, the company's headquarters and the branch run IPv6 IS-IS. The partner runs OSPFv3.

Configure the routers to meet the following requirements:

·     Reduce traffic for Router A and Router B because they have relative low performance.

·     The Marketing department can reach the Finance department, the branch, and the partner.

·     The Finance department and the branch cannot reach each other, and the branch does not have a route to the Finance department.

Figure 1 Network diagram

 

Analysis

To meet the network requirements, you must perform the following tasks:

·     To reduce traffic for Router A and Router B, configure them as Level-1 routers to allow communication only between the Marketing department and the Finance department.

·     Configure route redistribution between IPv6 IS-IS and OSPFv3 on Router D to allow communication between the Marketing department and the partner.

·     Configure Router C to use a prefix list to advertise only network 3001:1::/64 to Level-2, so that the branch does not have a route to the Finance department.

Procedures

Configuring Router A

# Configure an IPv6 address for Ten-GigabitEthernet3/1/1.

<RouterA> system-view

[RouterA] interface Ten-GigabitEthernet 3/1/1

[RouterA-Ten-GigabitEthernet3/1/1] ipv6 address 2001:1::1 64

[RouterA-Ten-GigabitEthernet3/1/1] quit

# Configure IPv6 addresses for other interfaces, as shown in Figure 1. (Details not shown.)

# Configure IPv6 IS-IS.

[RouterA] isis 1

[RouterA-isis-1] is-level level-1

[RouterA-isis-1] network-entity 10.3001.0001.0001.00

[RouterA-isis-1] address-family ipv6 unicast

[RouterA-isis-1-ipv6] quit

[RouterA-isis-1] quit

[RouterA] interface Ten-GigabitEthernet 3/1/1

[RouterA–Ten-GigabitEthernet3/1/1] isis ipv6 enable 1

[RouterA–Ten-GigabitEthernet3/1/1] quit

[RouterA] interface gigabitethernet 3/1/2

[RouterA–Ten-GigabitEthernet3/1/2] isis ipv6 enable 1

[RouterA–Ten-GigabitEthernet3/1/2] quit

Configuring Router B

# Configure an IPv6 address for Ten-GigabitEthernet3/1/1.

<RouterB> system-view

[RouterB] interface Ten-GigabitEthernet 3/1/1

[RouterB-Ten-GigabitEthernet3/1/1] ipv6 address 2001:2::1 64

[RouterB-Ten-GigabitEthernet3/1/1] quit

# Configure IPv6 addresses for other interfaces, as shown in Figure 1. (Details not shown.)

# Configure IPv6 IS-IS.

[RouterB] isis 1

[RouterB-isis-1] is-level level-1

[RouterB-isis-1] network-entity 10.3001.0002.0001.00

[RouterB-isis-1] address-family ipv6 unicast

[RouterB-isis-1-ipv6] quit

[RouterB-isis-1] quit

[RouterB] interface Ten-GigabitEthernet 3/1/1

[RouterB–Ten-GigabitEthernet3/1/1] isis ipv6 enable 1

[RouterB–Ten-GigabitEthernet3/1/1] quit

[RouterB] interface gigabitethernet 3/1/2

[RouterB–Ten-GigabitEthernet3/1/2] isis ipv6 enable 1

[RouterB–Ten-GigabitEthernet3/1/2] quit

Configuring Router C

# Configure an IPv6 address for Ten-GigabitEthernet3/1/1.

<RouterC> system-view

[RouterC] interface Ten-GigabitEthernet 3/1/1

[RouterC-Ten-GigabitEthernet3/1/1] ipv6 address 2001:1::2 64

[RouterC-Ten-GigabitEthernet3/1/1] quit

# Configure IPv6 addresses for other interfaces, as shown in Figure 1. (Details not shown.)

# Configure IPv6 IS-IS.

[RouterC] isis 1

[RouterC-isis-1] network-entity 10.2001.0010.0001.00

[RouterC-isis-1] address-family ipv6 unicast

[RouterC-isis-1-ipv6] quit

[RouterC-isis-1] quit

[RouterC] interface Ten-GigabitEthernet 3/1/1

[RouterC–Ten-GigabitEthernet3/1/1] isis ipv6 enable 1

[RouterC–Ten-GigabitEthernet3/1/1] quit

[RouterC] interface Ten-GigabitEthernet 3/1/2

[RouterC–Ten-GigabitEthernet3/1/2] isis ipv6 enable 1

[RouterC–Ten-GigabitEthernet3/1/2] quit

[RouterC] interface Ten-GigabitEthernet 3/1/3

[RouterC–Ten-GigabitEthernet3/1/3] isis ipv6 enable 1

[RouterC–Ten-GigabitEthernet3/1/3] quit

# Configure route leaking from Level-1 to Level-2, and use prefix list 1 to advertise only network 3001:1::/64 to Level-2.

[RouterC] ipv6 prefix-list 1 permit 3001:1:: 64

[RouterC] isis 1

[RouterC-isis-1] address-family ipv6

[RouterC-isis-1-ipv6] import-route isisv6 level-1 into level-2 filter-policy prefix-list 1

[RouterC-isis-1-ipv6] quit

[RouterC-isis-1] quit

Configuring Router D

# Configure an IPv6 address for Ten-GigabitEthernet3/1/1.

<RouterD> system-view

[RouterD] interface Ten-GigabitEthernet 3/1/1

[RouterD-Ten-GigabitEthernet3/1/1] ipv6 address 2001:10::2 64

[RouterD-Ten-GigabitEthernet3/1/1] quit

# Configure IPv6 addresses for other interfaces, as shown in Figure 1. (Details not shown.)

# Configure IPv6 IS-IS.

[RouterD] isis 1

[RouterD-isis-1] is-level level-2

[RouterD-isis-1] network-entity 20.2001.0020.0001.00

[RouterD-isis-1] address-family ipv6 unicast

[RouterD-isis-1-ipv6] quit

[RouterD-isis-1] quit

[RouterD] interface Ten-GigabitEthernet 3/1/1

[RouterD–Ten-GigabitEthernet3/1/1] isis ipv6 enable 1

[RouterD–Ten-GigabitEthernet3/1/1] quit

[RouterD] interface Ten-GigabitEthernet 3/1/2

[RouterD–Ten-GigabitEthernet3/1/2] isis ipv6 enable 1

[RouterD–Ten-GigabitEthernet3/1/2] quit

# Configure OSPFv3.

[RouterD] ospfv3

[RouterD-ospfv3-1] router-id 4.4.4.4

[RouterD-ospfv3-1] quit

[RouterD] interface Ten-GigabitEthernet 3/1/2

[RouterD–Ten-GigabitEthernet3/1/2] ospfv3 1 area 0

[RouterD–Ten-GigabitEthernet3/1/2] quit

# Redistribute OSPFv3 and direct routes into IPv6 IS-IS.

[RouterD] isis 1

[RouterD-isis-1] address-family ipv6

[RouterD-isis-1-ipv6] import-route ospfv3

[RouterD-isis-1-ipv6] import-route direct

[RouterD-isis-1-ipv6] quit

[RouterD-isis-1] quit

# Redistribute IPv6 IS-IS and direct routes into OSPFv3.

[RouterD] ospfv3 1

[RouterD-ospfv3-1] import-route isisv6 1

[RouterD-ospfv3-1] import-route direct

Configuring Router E

# Configure an IPv6 address for Ten-GigabitEthernet3/1/1.

<RouterE> system-view

[RouterE] interface Ten-GigabitEthernet 3/1/1

[RouterE-Ten-GigabitEthernet3/1/1] ipv6 address 2001:20::2 64

[RouterE-Ten-GigabitEthernet3/1/1] quit

# Configure IPv6 addresses for other interfaces, as shown in Figure 1. (Details not shown.)

# Configure OSPFv3.

[RouterE] ospfv3

[RouterE-ospfv3-1] router-id 5.5.5.5

[RouterE-ospfv3-1] quit

[RouterE] interface Ten-GigabitEthernet 3/1/1

[RouterE–Ten-GigabitEthernet3/1/1] ospfv3 1 area 0

[RouterE–Ten-GigabitEthernet3/1/1] quit

[RouterE] interface Ten-GigabitEthernet 3/1/2

[RouterE–Ten-GigabitEthernet3/1/2] ospfv3 1 area 0

[RouterE–Ten-GigabitEthernet3/1/2] quit

Verifying the configuration

# Verify that the branch can reach the Marketing department, but cannot reach the Finance department.

[RouterD] display isis route ipv6

 

                         Route information for IS-IS(1)

                         ------------------------------

 

                         Level-2 IPv6 Forwarding Table

                         -----------------------------

 

 Destination : 2001:10::                               PrefixLen: 64

 Flag        : D/L/-                                   Cost     : 10

 Next hop    : Direct                                  Interface: XGE3/1/1

 

 Destination : 2001:1::                                PrefixLen: 64

 Flag        : R/-/-                                   Cost     : 20

 Next hop    : FE80::7625:8AFF:FE02:4D13               Interface: XGE3/1/1

 

 Destination : 2001:2::                                PrefixLen: 64

 Flag        : R/-/-                                   Cost     : 20

 Next hop    : FE80::7625:8AFF:FE02:4D13               Interface: XGE3/1/1

 

 Destination : 3001:1::                                PrefixLen: 64

 Flag        : R/-/-                                   Cost     : 30

 Next hop    : FE80::7625:8AFF:FE02:4D13               Interface: XGE3/1/1

 

      Flags: D-Direct, R-Added to Rib, L-Advertised in LSPs, U-Up/Down Bit Set

# Verify that the company can communicate with the partner.

·     Display the IPv6 IS-IS routing table on Router C.

[RouterC] display isis route ipv6 level-2

 

                         Route information for IS-IS(1)

                         ------------------------------

 

                         Level-2 IPv6 Forwarding Table

                         -----------------------------

 

 Destination : 2001:10::                               PrefixLen: 64

 Flag        : D/L/-                                   Cost     : 10

 Next hop    : Direct                                  Interface: XGE3/1/3

 

 Destination : 2001:1::                                PrefixLen: 64

 Flag        : D/L/-                                   Cost     : 10

 Next hop    : Direct                                  Interface: XGE3/1/1

 

 

 Destination : 2001:2::                                PrefixLen: 64

 Flag        : D/L/-                                   Cost     : 10

 Next hop    : Direct                                  Interface: XGE3/1/2

 

 Destination : 2001:20::                               PrefixLen: 64

 Flag        : R/L/-                                   Cost     : 20

 Next hop    : FE80::BAAF:67FF:FE30:3304               Interface: XGE3/1/3

 

 Destination : 3001:200::                              PrefixLen: 64

 Flag        : R/-/-                                   Cost     : 20

 Next hop    : FE80::BAAF:67FF:FE30:3304               Interface: XGE3/1/3

 

      Flags: D-Direct, R-Added to Rib, L-Advertised in LSPs, U-Up/Down Bit Set

·     Ping 3001:200::1 from the interface XGE3/1/2 on Router A.

[RouterA] ping ipv6 –a 3001:1::1 3001:200::1

Ping6(56 data bytes) 3001:1::1 --> 3001:200::1, press CTRL_C to break

56 bytes from 3001:200::1, icmp_seq=0 hlim=61 time=7.230 ms

56 bytes from 3001:200::1, icmp_seq=1 hlim=61 time=3.449 ms

56 bytes from 3001:200::1, icmp_seq=2 hlim=61 time=2.779 ms

56 bytes from 3001:200::1, icmp_seq=3 hlim=61 time=2.652 ms

56 bytes from 3001:200::1, icmp_seq=4 hlim=61 time=2.558 ms

 

--- Ping6 statistics for 3001:200::1 ---

5 packet(s) transmitted, 5 packet(s) received, 0.0% packet loss

round-trip min/avg/max/std-dev = 2.558/3.734/7.230/1.776 ms

Configuration files

·     Router A:

#

isis 1

 is-level level-1

 network-entity 10.3001.0001.0001.00

 #

 address-family ipv6 unicast

#

interface Ten-GigabitEthernet3/1/1

 isis ipv6 enable 1

 ipv6 address 2001:1::1/64

#

interface Ten-GigabitEthernet3/1/2

 isis ipv6 enable 1

 ipv6 address 3001:1::1/64

#

·     Router B:

#

isis 1

 is-level level-1

 network-entity 10.3001.0002.0001.00

 #

 address-family ipv6 unicast

#

interface Ten-GigabitEthernet3/1/1

 isis ipv6 enable 1

 ipv6 address 2001:2::1/64

#

interface Ten-GigabitEthernet3/1/2

 isis ipv6 enable 1

 ipv6 address 3001:2::1/64

#

·     Router C:

#

isis 1

 network-entity 10.2001.0010.0001.00

 #

 address-family ipv6 unicast

  import-route isisv6 level-1 into level-2 filter-policy prefix-list 1

#

interface Ten-GigabitEthernet3/1/1

 isis ipv6 enable 1

 ipv6 address 2001:1::2/64

#

interface Ten-GigabitEthernet3/1/2

 isis ipv6 enable 1

 ipv6 address 2001:2::2/64

#

interface Ten-GigabitEthernet3/1/3

 isis ipv6 enable 1

 ipv6 address 2001:10::1/64

#

 ipv6 prefix-list 1 index 10 permit 3001:1:: 64

#

·     Router D:

#

isis 1

 is-level level-2

 network-entity 20.2001.0020.0001.00

#

 address-family ipv6 unicast

  import-route direct

  import-route ospfv3 1

#

ospfv3 1

 router-id 4.4.4.4

 area 0.0.0.0

 import-route direct

 import-route isisv6 1

#

interface Ten-GigabitEthernet3/1/1

 isis ipv6 enable 1

 ipv6 address 2001:10::2/64

#

interface Ten-GigabitEthernet3/1/2

 ospfv3 1 area 0.0.0.0

 ipv6 address 2001:20::1/64

#

·     Router E:

#

ospfv3 1

 router-id 5.5.5.5

 area 0.0.0.0

#

interface Ten-GigabitEthernet3/1/1

 ospfv3 1 area 0

 ipv6 address 2001:20::2/64

#

interface Ten-GigabitEthernet3/1/2

 ospfv3 1 area 0

 ipv6 address 3001:200::1/64

#

Related documentation

·     H3C CR16000-F Routers Layer—3 IP Routing Configuration Guide-R8385P09

·     H3C CR16000-F Routers Layer—3 IP Routing Command Reference-R8385P09

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