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Use ACL to make routing policy, but import an extra aggregation routing

Publication Date:  2012-10-22 Views:  112 Downloads:  0

Issue Description

There are two routers BSR 1 and BSR 2 in the network, in the BSR 1 configuration routing policy import a certain routing.
Network topology is as follows:
There are two aggregation routing and in BSR 2, BSR need import
After the configuration has been completed, and found that import an extra aggregation routing, and are all imported

Alarm Information


Handling Process

In the BSR 1 execute the following command:
Step 1 execute system - view command, into the system view.
Step 2 execute command ip ip-prefix test greater-equal 16 less-equal 16, configure IPv4 address prefix list.
Set the IP prefix greater - equal and less - equal to 16, i.e. introducing 16 bit mask routing.
Step 3 execute command route - policy test permit node 10, create route - policy node, and enter the route - policy view.
Step 4 execute command if-match ip-prefix test, matching address prefix list.
- end
Complete the above configuration, can success to import a route, and filter routing.

Root Cause

In the BSR 1 check routing policy configuration situation, found that the policy matching condition referenced routing policy is ACL, ACL configuration is as follows:
acl 2001
rule 10 permit source
The introduced two routing IP prefix is and
Routing policy ACL only support a standard ACL, namely only contains source IP address and mask.
For standard ACL, do not consider IP prefix length, as long as the prefix number matching (IP prefix composed by prefix number and prefix length), that means matching. So two routing were matched to and is introduced.


When filter route, need to pay attention to ACL and IP prefix application effect, when need to accurately determine mask length, use IP prefix to define.