To configure IS-IS on a routing instance
Purpose
Routing instance IS-IS parameter values can differ from the IS-IS interface parameter values that are configured in To configure an IS-IS interface . Interface capabilities are compared to the router-wide capabilities to determine the type of level 1, level 2, and level 1 and 2 adjacencies that are set up between routers to exchange IS-IS routing information.
Steps
1 |
Enable the IS-IS protocol on a routing instance, as described in To enable IS-IS on a routing instance . |
2 |
In the navigation tree Routing view, expand Network→NE→Routing Instance→ISIS Instances. |
3 |
Right-click on the ISIS Instances object and choose Create ISIS Instance, or right-click on an ISIS Instance object and choose Properties. The ISIS Site, Routing Instance, ISIS Instance (Create|Edit) form opens. |
4 |
Configure the required general IS-IS instance parameters. A level 1 adjacency can be established when there is at least one area ID shared by this router and a neighboring router. A level 2 adjacency is established when another router is configured as a level 2 or a level 1 and 2 router with interfaces configured as level 2 or level 1 and 2. A level 1 and 2 adjacency is created when the neighboring router is also configured as a level 1 and 2 router and the routers have at least one area ID in common. |
5 |
Click on the Behavior tab and configure the required parameters in the General panel. Note the following:
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6 |
Click on the LFA tab to configure the required Loop-free Alternates parameters. Remote loop-free alternate uses segment routing by default. To configure segment routing, see To configure IS-IS segment routing. |
7 |
Configure the required parameters on the Graceful Restart tab. |
8 |
Configure the required parameters to specify the allowed IP versions for the IS-IS instance on the IP Versions tab. |
9 |
Click Apply. |
10 |
Configure the authentication behavior: Perform the following steps:
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11 |
Configure route preferences and authentication for level 1 or level 2: Perform the following steps:
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12 |
Select up to five routing policy statements on the Export Policies tab. You can specify multiple routing policies, in order of preference, to determine the routes that are exported from the routing table to IS-IS. When multiple policies are specified, the policies are evaluated in numerical order. |
13 |
Select up to five routing policy statements on the Import Policies tab. You can specify multiple routing policies, in order of preference, to determine the routes that are imported to IS-IS. When multiple policies are specified, the policies are evaluated in numerical order. |
14 |
Select up to five loop-free alternate policy statements on the LFA tab. |
15 |
Configure participation in one or more flexible algorithms as needed:
Repeat this step to add additional flexible algorithms as needed. |
16 |
Configure one or more IGP shortcuts as needed: |
17 |
Configure a NET address: Perform the following steps: |
18 |
Configure a route summarization. IS-IS route summaries allow users to create aggregate IPv4 or IPv6 addresses that include multiple groups of IPv4 or IPv6 addresses for a specific IS-IS summary level. This can help reduce the size of the link state database and the routing table. Perform the following steps:
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19 |
To add an IS-IS interface: Perform the following steps:
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20 |
Save your changes and close the form. End of steps |