3Com 10014299 manual Troubleshooting IP, Configure RIP protocol, Normal operation

Troubleshooting IP Routing Policy 489

Figure 159 Networking diagram of filtering the distributed routing information

Campus network A 192.1.10.0 202.1.1.0 Campus network B

Router

1Configure ip-prefix

[Router]ip ip-prefix p1 permit 192.1.1.0/24

2Configure RIP protocol

[Router]rip

[Router-rip]network 192.1.0.0

[Router-rip]network 202.1.1.0

[Router-rip]filter-policy ip-prefix p1 export

Troubleshooting IP	Routing information cannot be filtered when the routing protocol is in
Routing Policy	normal operation

Check the following:

■At least one node in the routing policy should be in permit matching mode. When a routing policy is used to filter routing information or a specific routing information does not pass the filtering of a node, the routing information is considered not passing the filtering of this routing policy. When all nodes of the routing policy are in deny mode, no routing information will pass the filtering of this routing policy.

■At least one item in the prefix-list should be in permit matching mode. The list items in deny mode can be defined to fast filtering routing information that does not meet the conditions. But if all list items are in deny mode, no route will pass the filtering of this prefix-list. Define a permit 0.0.0.0/0 list item after multiple items are defined in deny modes, so that all other routes will pass the filtering.

When an ACL is quoted for filtering routing information and ACL definition is modified, the route strategy is not updated.

In this case, reconfigure by quoting the strategy and rule of this ACL to inform the protocol of the ACL change. If other filters are quoted, this operation is not necessary and the protocols are informed of the change of the router.