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A Case On Invalid Route Filter of OSPF

Publication Date:  2012-07-27 Views:  372 Downloads:  0

Issue Description

Configure ACL to filter the routs from a network segment, but the IP route table still contains the route entries of the network segment. 

Alarm Information

No

Handling Process

After changing the mask in rule to inverse mask, such as:
rule normal deny source 30.1.1.0 0.0.255.255
Reconfigure filter-policy 2000 import in OSPF mode 

Root Cause

It is required to filter the routes from network segment 30.1.0.0/16, but the rule in ACL to deny the network segment uses the mask as: 
acl 2000
rule normal deny source 30.1.0.0 255.255.0.0
So it cannot filter the routes from network segment 30.1.0.0/16.

Suggestions

When configuring the rules of ACL, match the inverse mask. 

END