Configuring IS-IS for IPv6

2017-11-03 09:05:07

Problem

You want to use IS-IS on an IPv6 network.

Solution

The IS-IS configuration for an IPv6 network is the same as for IPv4. Configure the interfaces, enable ISO on the IS-IS interfaces, and configure a NET on lo0:

[edit protocols isis] aviva@RouterG# set interface fe-0/0/1 aviva@RouterG# set interface fe-1/0/1 aviva@RouterG# set interface lo0.0 [edit interfaces] aviva@RouterG# set fe-0/0/1 unit 0 family iso aviva@RouterG# set fe-1/0/1 unit 0 family iso aviva@RouterG# set lo0 unit 0 family iso address 49.0020.1921.6801.9001.00

Discussion

Because IS-IS runs directly on the data-link layer (Layer 2), from an IS-IS point of view, there is nothing different or special about configuring it for an IPv6 environment. The only thing you do differently is set IPv6 addresses on the physical interfaces instead of IPv4 addresses. This recipe configures a router that connects to two other Level 1Level 2 IS-IS routers.

Again, use the show isis interface command to see the configured IS-IS interfaces:

aviva@RouterG> show isis interface IS-IS interface database: Interface L CirID Level 1 DR Level 2 DR L1/L2 Metric fe-0/0/1.0 3 0x2 RouterG.02 RouterG.02 10/10 fe-1/0/1.0 3 0x3 RouterJ.03 RouterJ.03 10/10 lo0.0 0 0x1 Passive Passive 0/0

When looking at the adjacencies, you can see the IPv6 addresses configured on the router:

aviva@RouterG> show isis adjacency detail RouterH Interface: fe-0/0/1.0, Level: 2, State: Up, Expires in 19 secs Priority: 64, Up/Down transitions: 1, Last transition: 00:18:55 ago Circuit type: 3, Speaks: IP, IPv6, CLNS, MAC address: 0:5:85:c1:d1:d1 Topologies: Unicast Restart capable: Yes LAN id: Incredible-Hulk.02, IP addresses: 192.168.18.1 IPv6 addresses: fe80::205:85ff:fec1:d1d1 …

The IS-IS database output is also unchanged. If you look at the detail version of the output, you now see the IPv6 address prefixes:

aviva@RouterG> show isis database level 2 detail IS-IS level 2 link-state database: RotuerJ.00-00 Sequence: 0x5, Checksum: 0x9645, Lifetime: 647 secs IS neighbor: RouterJ.02 Metric: 10 IS neighbor: RouterJ.03 Metric: 10 V6 prefix: 9009:1::/64 Metric: 10 Internal Up V6 prefix: 9009:2::/64 Metric: 20 Internal Up V6 prefix: 9009:3::/64 Metric: 10 Internal Up …

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