Configuration Steps

Step 1: Configure system hostnames and IPv6 addresses on all routers as follows.

****************************R1
sys
sysname R1
#
ipv6
#
interface GigabitEthernet0/0/0
 ipv6 enable
 ipv6 address 2001:DB5::3:2/64
#

****************************R2
sys
sysname R2
#
ipv6
#
interface GigabitEthernet0/0/0
 ipv6 enable
 ipv6 address 2001:DB5::3:1/64
#
interface GigabitEthernet0/0/1
 ipv6 enable
 ipv6 address 2001:DB6::2:2/64
#
interface GigabitEthernet0/0/2
 ipv6 enable
 ipv6 address 2001:DB7::1:1/64
#

****************************R3
sys
sysname R3
#
ipv6
#
interface GigabitEthernet0/0/0
 ipv6 enable
 ipv6 address 2001:DB6::2:3/64
#

****************************R4
sys
sysname R4
#
ipv6
#
interface GigabitEthernet0/0/0
 ipv6 enable
 ipv6 address 2001:DB7::1:2/64
#
interface GigabitEthernet0/0/1
 ipv6 enable
 ipv6 address 2001:DB8::4:1/64
#

****************************R5
sys
sysname R5
#
ipv6
#
interface GigabitEthernet0/0/0
 ipv6 enable
 ipv6 address 2001:DB8::4:2/64
#

Step 2: Configure IS-IS for IPv6 and enable it on respective interfaces as follows.

*****************************R1
isis 1
 is-level level-1
 is-name R1
 network-entity 49.0001.0000.0000.0001.00
 #
 ipv6 enable topology ipv6
 #
interface GigabitEthernet0/0/0
 isis ipv6 enable 1
#

*****************************R2
isis 1
 is-level level-1-2
 is-name R2
 network-entity 49.0001.0000.0000.0002.00
 #
 ipv6 enable topology ipv6
 #
interface GigabitEthernet0/0/0
 isis ipv6 enable 1
#
interface GigabitEthernet0/0/1
 isis ipv6 enable 1
#
interface GigabitEthernet0/0/2
 isis ipv6 enable 1
#

*****************************R3
isis 1
 is-level level-1
 is-name R3
 network-entity 49.0001.0000.0000.0003.00
 #
 ipv6 enable topology ipv6
 #
interface GigabitEthernet0/0/0
 isis ipv6 enable 1
#

*****************************R4
isis 1
 is-level level-2
 is-name R4
 network-entity 49.0002.0000.0000.0004.00
 #
 ipv6 enable topology ipv6
 #
interface GigabitEthernet0/0/0
 isis ipv6 enable 1
#
interface GigabitEthernet0/0/1
 isis ipv6 enable 1
#

*****************************R5
isis 1
 is-level level-2
 is-name R5
 network-entity 49.0002.0000.0000.000.500
 #
 ipv6 enable topology ipv6
 #
interface GigabitEthernet0/0/0
 isis ipv6 enable 1
#

Step 3: Verify the IS-IS status and the routing table on routers.

Thank you for reading the article and please leave your comments in the comments section.

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