Why Are Routes Discarded After I Configure a Policy to Modify Attributes of the Routes?

Adamcolob · Created May 5, 2017 06:08:05

To set the local-preference of a VPNv4 route with the community attribute being 1000:1 on plane 1 to 100 and set the local-preference of a VPNv4 route with the community attribute being 1000:2 on plane 2 to 200, you need to configure the following policy:

ip community-filter 1 permit 1000:1
ip community-filter 2 permit 1000:2

route-policy planechoice permit node 10
if-match community-filter 1
apply local-preference 100
route-policy planechoice permit node 20
if-match community-filter 2
apply local-preference 200

bgp 65000
ipv4-family vpnv4
policy vpn-target
peer 10.10.4.13 enable
peer 10.10.4.13 route-policy planechoice importAfter the policy is configured, the VPNv4 routes that do not match the two if-match clauses are discarded.

When configuring the policy, you must check whether a null node needs to be configured. Otherwise, you intend to modify the attributes of routes if the routes meet certain conditions and do not modify the attributes of the routes if the routes do not meet the conditions, but the attributes of routes are modified if the routes meet the conditions and are denied if the routes do not meet the conditions after the configuration. When the route-policy plane choice permit node 30 command is run after the policy is modified, the routes that do not match the two if-match clauses continue to be matched with the next node, and pass the policy on node 30.

route-policy planechoice permit node 10
if-match community-filter 1
apply local-preference 100
route-policy planechoice permit node 20
if-match community-filter 2
apply local-preference 200
route-policy planechoice permit node 30

Why Are Routes Discarded After I Configure a Policy to Modify Attributes of the Routes?

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Why Are Routes Discarded After I Configure a Policy to Modify Attributes of the Routes?

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