Configuring IPv4 IS-IS redistribution

Use this procedure to configure IS-IS redistribution. In the Virtual Routing and Forwarding (VRF), just like in the Global Router, the routes are not redistributed into IS-IS automatically. To advertise the VRF routes, you must explicitly redistribute one of the following protocols into IS-IS: direct, static, RIP, OSPF, or BGP, within the context of a VRF. Routing between VRFs is also possible by using redistribution policies and injecting routes from the other protocols.

The VRF specific routes are transported in TLV 184 with the I-SID assigned to the VPNs. After extracting the IP VPN IP reachability information, the routes are installed in the route tables of the appropriate VRFs based on the I-SID association.

Procedure

  1. In the navigation pane, expand Configuration > IP.
  2. Click IS-IS.
  3. Click the Redistribute tab.
  4. Click Insert.
  5. Complete the fields as required.
  6. Click Insert.

IS-IS Redistribute field descriptions

Use the data in the following table to configure the IS-IS Redistribute tab.

Name

Description

DstVrfId

Specifies the destination Virtual Routing and Forwarding (VRF) ID used in the redistribution.

Protocol

Specifies the protocols that receive the redistributed routes.

SrcVrfId

Specifies the source VRF ID used in the redistribution. For IS-IS, the source VRF ID must be the same as the destination VRF ID.

RouteSource

Specifies the source protocol for the route redistribution entry.

Enable

Enables or disables a redistribution entry. The default is disable.

RoutePolicy

Specifies the route policy to be used for the detailed redistribution of external routes from a specified source into the IS-IS domain.

Metric

Specifies the metric for the redistributed route. The value can be a range between 0 to 65535. The default value is 0. Use a value that is consistent with the destination protocol.

MetricType

Specifies the metric type. Specifies a type1 or a type2 metric. For metric type1, the cost of the external routes is equal to the sum of all internal costs and the external cost. For metric type2, the cost of the external routes is equal to the external cost alone. The default is type2.

Subnets

Indicates whether the subnets are advertised individually or aggregated to their classful subnet. Choose suppress to advertise subnets aggregated to their classful subnet. Choose allow to advertise the subnets individually with the learned or configured mask of the subnet. The default is allow.
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