3Com WX3000 operation manual Troubleshooting IP Route Policy, Precautions

Precautions

1)When you configure the apply cost command in a route policy:

zThe new cost should be greater than the original one to prevent RIP from generating routing loop in the case that a loop exists in the topology.

zThe cost will become 16 if you try to set it to a value greater than 16.

zThe cost will become the original one if you try to set it to 0.

zThe cost will still be 16 if you try to set it to 16.

2)Using the if-match interface command will match the routes whose outgoing interface to the next hop is the specified interface.

3)You are recommended to configure a node to match all routes not passing the preceding nodes in a route policy.

4)If the cost of a received RIP route is equal to 16, the cost specified by the apply cost command in a route policy will not be applied to the route, that is, the cost of the route is equal to 16.

5)Using the filter-policycommand does not filter redistributed routes.

Troubleshooting IP Route Policy

Symptom

The route policy cannot filter routing information correctly when the routing protocol runs normally.

Analysis

The route policy cannot filter routing information correctly in the following two cases:

z

z

All nodes in the route policy are in the deny mode. All entries in the IP-prefix list are in the deny mode.

Solution

1)Use the display ip ip-prefixcommand to display the configuration of the IP-prefix list.

2)Use the display route-policycommand to display the configuration of the route policy.

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