To configure an IS-IS interface

Purpose

The IS-IS interface parameters can differ from the IS-IS routing instance parameters configured in To configure IS-IS on a routing instance . Interface parameters specify the interface routing levels. Interface level capabilities are compared to the router-wide level capabilities to determine the type of level 1, level 2, and level 1 and 2 adjacencies that are created between devices.

Steps
 
1 

Enable the IS-IS protocol on a routing instance, as described in To enable IS-IS on a routing instance . If no IS-IS instance exists, you must create one by performing To configure IS-IS on a routing instance .

2 

In the navigation tree Routing view, expand Network→NE→Routing Instance→ISIS Instances→ISIS Instance.

3 

Right-click on the ISIS Instance object and choose Create Interface or right-click on an ISIS Interface object and choose Properties. The ISIS Interface (Create|Edit) form opens.

4 

If you are creating an IS-IS interface, select an interface in the Interface panel.

5 

Configure the required parameters on the General tab.

6 

Click on the Behavior tab and configure the required parameters.

To create a mesh group, set the Mesh Group Status parameter to Enabled and specify the same mesh group value for all interfaces. The mesh group parameters specify the assigned mesh group for the interface. Mesh groups limit the amount of flooding that occurs when a new or changed LSP is advertised in an area.

The TE Metric parameter is a read-only field that displays the TE metric used for LSP path computation by CSPF.

The Default Instance parameter is configurable on interfaces on non-zero IS-IS instances.

7 

Click on the Segment Routing tab and configure the required parameters.

You cannot configure the IPv4 or IPv6 SID Type or SID Value parameter on a network interface that is not loopback enabled or that is on a service interface. In the navigation tree Routing view, expand Network→NE→Routing Instance→Interface, right-click on the interface and choose Properties. Configure the Loopback Enabled parameter on the Network Interface (Edit) form.

The IPv4 or IPv6 SID Value range depends on the Prefix Start Label and Prefix Map Index configured in the IS-IS instance, see To configure IS-IS segment routing. The IPv6 SID value cannot be the same as the IPv4 SID.

8 

Configure the required parameters on the Flexible Algorithms tab.

You cannot configure the IPv4 or IPv6 SID Type or SID Value parameter on a network interface that is not loopback enabled or that is on a service interface. In the navigation tree Routing view, expand Network→NE→Routing Instance→Interface, right-click on the interface and choose Properties. Configure the Loopback Enabled parameter on the Network Interface (Edit) form.

The IPv6 SID value cannot be the same as the IPv4 SID.

  1. Click Search to populate a list of flexible algorithms.

  2. Choose a flexible algorithm and click Properties, or click Create. The Interface Flexible Algorithm (Create|Edit) form opens.

  3. Configure the Flexible Algorithm ID parameter.

  4. Configure the IPv4 and IPv6 SID parameters as needed.

  5. Click OK.

Repeat this step to add additional flexible algorithms as needed.

9 

Configure the required parameters on the Authentication and Policies tabs.

10 

Configure the route preferences and authentication for level 1 or level 2:

Perform the following steps:

  1. Click on the Level 1 or Level 2 tab and configure the required parameters on the General sub-tab.

  2. Click on the Authentication sub-tab and configure the required parameters.

11 

Save your changes and close the form.

End of steps