Troubleshooting Ip Routing Policy - Huawei Quidway S5600 Series Operation Manual

Operation Manual – Routing Protocol
Quidway S5600 Series Ethernet Switches-Release 1510

6.9 Troubleshooting IP Routing Policy

Symptom: Routing information cannot be filtered when the routing protocol runs
normally.
Solution: Check to see the following requirements are satisfied.
At least one node in a route-policy should be in permit mode. When a route-policy is
used to filter routing information, if a piece of routing information filters through no node
in the route-policy, it means that the route information does not pass the filtering of the
route-policy. Therefore, when all the nodes in the route-policy are in the deny mode, no
routing information will pass the filtering of the route-policy.
At least one item in an ip-prefix list should be in permit mode. The items in deny mode
can be defined first to rapidly filter out the routing information not meeting the condition.
However, if all the items are in the deny mode, no route will pass the ip-prefix filtering.
You can define the item "permit 0.0.0.0 0 less-equal 32" after multiple items in the deny
mode for all other routes to pass the filtering (if less-equal 32 is not specified, only the
default route will be matched).
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Chapter 6 IP Routing Policy Configuration