Example for Configuring Basic IS-IS IPv6 Functions

This section describes how to configure basic IS-IS IPv6 functions, including enabling IPv6 globally, configuring an IPv6 address and enabling IPv6 for each interface, and configuring basic IS-IS functions and enabling IPv6.

Networking Requirements

As shown in Figure 1:

Device A, Device B, Device C, and Device D belong to the same AS. It is required that IS-IS run on them to implement IPv6 interworking.
Device A, Device B, and Device C belong to Area 10, and Device D belongs to Area 20.
Device A and Device B are Level-1 devices; Device C is a Level-1-2 device; Device D is a Level-2 device.

Figure 1 Configuring basic IS-IS IPv6 functions

Device Name	Interface	IP Address
Device A	GE 0/1/0	2001:db8:1::2/64
Device B	GE 0/1/0	2001:db8:2::2/64
Device C	GE 0/1/0	2001:db8:1::1/64
	GE0/1/8	2001:db8:2::1/64
	GE 0/1/16	2001:db8:3::1/64
Device D	GE 0/1/0	2001:db8:3::2/64
Device D	GE 0/1/8	2001:db8:4::1/64

Configuration Roadmap

The configuration roadmap is as follows:

Enable the IPv6 forwarding capability on each router, and configure an IPv6 address for each interface.
Enable IS-IS, configure the level, and specify the NET on each router.

Data Preparation

To complete the configuration, you need the following data:

IPv6 addresses of the interfaces on Device A, Device B, Device C, and Device D
AS numbers of Device A, Device B, Device C, and Device D
Levels of Device A, Device B, Device C, and Device D

Procedure

Enable IPv6, and configure an IPv6 address for each interface. Use the command output on Device A as an example. The configurations of the other three routers are the same as that of Device A. For configuration details, see Configuration Files in this section.

<HUAWEI> system-view
[~HUAWEI] sysname DeviceA
[*HUAWEI] commit
[~DeviceA] interface gigabitethernet 0/1/0
[~DeviceA-GigabitEthernet0/1/0] ipv6 enable
[*DeviceA-GigabitEthernet0/1/0] ipv6 address 2001:db8:1::2 64
[*DeviceA-GigabitEthernet0/1/0] commit

Configure IS-IS.

# Configure Device A.

[~DeviceA] isis 1
[*DeviceA-isis-1] is-level level-1
[*DeviceA-isis-1] network-entity 10.0000.0000.0001.00
[*DeviceA-isis-1] ipv6 enable topology ipv6
[*DeviceA-isis-1] quit
[*DeviceA] interface gigabitethernet 0/1/0
[*DeviceA-GigabitEthernet0/1/0] isis ipv6 enable 1
[*DeviceA-GigabitEthernet0/1/0] commit
[~DeviceA-GigabitEthernet0/1/0] quit

# Configure Device B.

[~DeviceB] isis 1 
[*DeviceB-isis-1] is-level level-1
[*DeviceB-isis-1] network-entity 10.0000.0000.0002.00
[*DeviceB-isis-1] ipv6 enable topology ipv6
[*DeviceB-isis-1] quit
[*DeviceB] interface gigabitethernet 0/1/0
[*DeviceB-GigabitEthernet0/1/0] isis ipv6 enable 1
[*DeviceB-GigabitEthernet0/1/0] commit
[~DeviceB-GigabitEthernet0/1/0] quit

# Configure Device C.

[~DeviceC] isis 1
[*DeviceC-isis-1] network-entity 10.0000.0000.0003.00
[*DeviceC-isis-1] ipv6 enable topology ipv6
[*DeviceC-isis-1] quit
[*DeviceC] interface gigabitethernet 0/1/0
[*DeviceC-GigabitEthernet0/1/0] isis ipv6 enable 1
[*DeviceC-GigabitEthernet0/1/0] quit
[*DeviceC] interface gigabitethernet 0/1/8
[*DeviceC-GigabitEthernet0/1/8] isis ipv6 enable 1
[*DeviceC-GigabitEthernet0/1/8] quit
[*DeviceC] interface gigabitethernet 0/1/16
[*DeviceC-GigabitEthernet0/1/16] isis ipv6 enable 1
[*DeviceC-GigabitEthernet0/1/16] isis circuit-level level-1-2
[*DeviceC-GigabitEthernet0/1/16] commit
[~DeviceC-GigabitEthernet0/1/16] quit

# Configure Device D.

[~DeviceD] isis 1 
[*DeviceD-isis-1] is-level level-2
[*DeviceD-isis-1] network-entity 20.0000.0000.0004.00
[*DeviceD-isis-1] ipv6 enable topology ipv6
[*DeviceD-isis-1] quit
[*DeviceD] interface gigabitethernet 0/1/0
[*DeviceD-GigabitEthernet0/1/0] isis ipv6 enable 1
[*DeviceD-GigabitEthernet0/1/0] quit
[*DeviceD] interface gigabitethernet 0/1/8
[*DeviceD-GigabitEthernet0/1/8] isis ipv6 enable 1
[*DeviceD-GigabitEthernet0/1/8] commit
[~DeviceD-GigabitEthernet0/1/8] quit

Verify the configuration.

# Display the IS-IS routing table of Device A. The command output shows that Device A has the routes to each network segment of the Level-1 area.

[~DeviceA] display isis route
                         Route information for ISIS(1)
                         -----------------------------
                        ISIS(1) Level-1 Forwarding Table
                        --------------------------------
IPV6 Dest.         ExitInterface                 NextHop                  Cost         Flags
----------------------------------------------------------------------------------------
 ::/0              GigabitEthernet0/1/0          FE80::A83E:0:3ED2:1      10           A/-/-
 2001:db8:1::/64   GigabitEthernet0/1/0          Direct                   10           D/L/-
 2001:db8:2::/64   GigabitEthernet0/1/0          FE80::A83E:0:3ED2:1      20           A/-/-
     Flags: D-Direct, A-Added to URT, L-Advertised in LSPs, S-IGP Shortcut,
                                 U-Up/Down Bit Set
     Protect Type: L-Link Protect, N-Node Protect

# Display detailed information about IS-IS neighbors on Device C.

[~DeviceC] display isis peer verbose
                       Peer information for ISIS(1)                            
  System Id        Interface            Circuit Id       State  HoldTime   Type    PRI 
------------------------------------------------------------------------------------------
0000.0000.0001   GigabitEthernet0/1/0   0000000001        Up     24s        L1     --
  MT IDs supported     : 0(UP) 
  Local MT IDs         : 0
  Area Address(es)     : 10
  Peer IPv6 Address(es): FE80::996B:0:9419:1
  Peer IPv6 GlbAddr(es): 2001:db8:1::2/64
  Uptime               : 00h00m15s
  Peer Up Time         : 2020-06-08 01:41:57
  Adj Protocol         : IPV6
  Restart Capable      : YES
  Suppressed Adj       : NO 
  Peer System ID       : 0000.0000.0001
  BFD Incr-Cost State  : MT0 : NO / MT2 : NO
0000.0000.0002 GigabitEthernet0/1/8            0000000001        Up   28s      L1       --
  Local MT IDs         : 0
  Area Address(es)     : 10
  Peer IPv6 Address(es): FE80::DC40:0:47A9:1
  Peer IPv6 GlbAddr(es): 2001:db8:2::2/64
  Uptime               : 00h00m15s
  Peer Up Time         : 2020-06-08 01:41:57
  Adj Protocol         : IPV6
  Restart Capable      : YES
  Suppressed Adj       : NO 
  Peer System ID       : 0000.0000.0002
  BFD Incr-Cost State  : MT0 : NO / MT2 : NO
0000.0000.0004 GigabitEthernet0/1/16            0000000001        Up   24s      L2       --
  Local MT IDs         : 0
  Area Address(es)     : 20
  Peer IPv6 Address(es): FE80::F81D:0:1E24:2
  Peer IPv6 GlbAddr(es): 2001:db8:3::2/64
  Uptime               : 00h00m15s
  Peer Up Time         : 2020-06-08 01:41:57
  Adj Protocol         : IPV6
  Restart Capable      : YES
  Suppressed Adj       : NO 
  Peer System ID       : 0000.0000.0004
  BFD Incr-Cost State  : MT0 : NO / MT2 : NO
Total Peer (s): 3

# Display detailed information about the IS-IS LSDB of Device C.

[~DeviceC] display isis lsdb verbose
                        Database information for ISIS(1)
                        --------------------------------
                          Level-1 Link State Database
LSPID                 Seq Num      Checksum      Holdtime      Length  ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0001.00-00  0x0000000c   0x4e06        1117          113     0/0/0
 SOURCE       0000.0000.0001.00
 NLPID        IPV6
 AREA ADDR    10
 INTF ADDR V6 2001:db8:1::2
 Topology     Standard
 NBR  ID      0000.0000.0003.00  COST: 10
 IPV6         2001:db8:1::/64                       COST: 10
0000.0000.0002.00-00  0x00000009   0x738c        1022          83      0/0/0
 SOURCE       0000.0000.0002.00
 NLPID        IPV6
 AREA ADDR    10
 INTF ADDR V6 2001:db8:2::2
 Topology     Standard
 NBR  ID      0000.0000.0003.00  COST: 10
 IPV6         2001:db8:2::/64                       COST: 10
0000.0000.0003.00-00* 0x00000020   0x6b10        771           140     1/0/0
 SOURCE       0000.0000.0003.00
 NLPID        IPV6
 AREA ADDR    10
 INTF ADDR V6 2001:db8:3::1
 INTF ADDR V6 2001:db8:2::1
 INTF ADDR V6 2001:db8:1::1
 Topology     Standard
 NBR  ID      0000.0000.0002.00  COST: 10
 NBR  ID      0000.0000.0001.00  COST: 10
 IPV6         2001:db8:2::/64                       COST: 10
 IPV6         2001:db8:1::/64                       COST: 10
Total LSP (s) : 5
..*(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended),
          ATT-Attached, P-Partition, OL-Overload
                          Level-2 Link State Database
LSPID                 Seq Num      Checksum      Holdtime      Length  ATT/P/OL
-------------------------------------------------------------------------------
0000.0000.0003.00-00* 0x00000017   0x61b4        771           157     0/0/0
 SOURCE       0000.0000.0003.00
 NLPID        IPV6
 AREA ADDR    10
 INTF ADDR V6 2001:db8:3::1
 INTF ADDR V6 2001:db8:2::1
 INTF ADDR V6 2001:db8:1::1
 Topology     Standard
 NBR  ID      0000.0000.0004.00  COST: 10
 IPV6         2001:db8:3::/64                       COST: 10
 IPV6         2001:db8:2::/64                       COST: 10
 IPV6         2001:db8:1::/64                       COST: 10
0000.0000.0004.00-00  0x0000000b   0x6dfa        1024          124     0/0/0
 SOURCE       0000.0000.0004.00
 NLPID        IPV6
 AREA ADDR    20
 INTF ADDR V6 2001:db8:3::2
 INTF ADDR V6 2001:db8:4::1
 Topology     Standard
 NBR  ID      0000.0000.0003.00  COST: 10
 NBR  ID      0000.0000.0005.00  COST: 10
 IPV6         2001:db8:3::/64                         COST: 10
 IPV6         2001:db8:4::/64                         COST: 10
Total LSP(s): 3
..*(In TLV)-Leaking Route, *(By LSPID)-Self LSP, +-Self LSP(Extended),
          ATT-Attached, P-Partition, OL-Overload

Configuration Files

Device A configuration file

#
sysname DeviceA
#
isis 1
 is-level level-1
 ipv6 enable topology ipv6
 network-entity 10.0000.0000.0001.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:1::2/64
 isis ipv6 enable 1
#
return

Device B configuration file

#
sysname DeviceB
#
isis 1
 is-level level-1
 ipv6 enable topology ipv6
 network-entity 10.0000.0000.0002.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:2::2/64
 isis ipv6 enable 1
#
return

Device C configuration file

#
sysname DeviceC
#
isis 1
 ipv6 enable topology ipv6
 network-entity 10.0000.0000.0003.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:1::1/64
 isis ipv6 enable 1
#
interface GigabitEthernet0/1/8
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:2::1/64
 isis ipv6 enable 1
#
interface GigabitEthernet0/1/16
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:3::1/64
 isis ipv6 enable 1
 isis circuit-level level-1-2
#
return

Device D configuration file

#
sysname DeviceD
#
isis 1
 is-level level-2
 ipv6 enable topology ipv6
 network-entity 20.0000.0000.0004.00
#
interface GigabitEthernet0/1/0
 undo shutdown
 ipv6 enable
 ipv6 address 2001:db8:3::2/64
 isis ipv6 enable 1
#
interface GigabitEthernet0/1/8
 ipv6 enable
 ipv6 address 2001:db8:4::1/64
 isis ipv6 enable 1
#
return