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NE20E-S2F -BGP Community Filter Issue

Publication Date:  2017-10-19 Views:  84 Downloads:  0
Issue Description

ip community-filter 1 permit 6333:6333
route-policy EXAMPLE deny node 10  if-match community-filter 1
import-route bgp permit-ibgp route-policy EXAMPLE
display route-policy EXAMPLE
  deny : 10 (matched counts: 0)
    Match clauses: if-match community-filter 1

Alarm Information

not applicable

Handling Process

not applicable

Root Cause

When redistribute routes from bgp to OSPF, the community will not take effect.
Actually, while a route is redistributed into OSPF, it  is not  redistributed from bgp routing table directly, but from IP routing table.
The bgp routes are put into IP routing table first, then redistribute this routes from IP routing table to OSPF table. So it will loss the community attribute while put bgp routes into IP routing table.

Solution

Use ip-prefix to filter the routes while redistribute routes from bgp to OSPF. This limitation is not only for NE20E, but just a limitation of the VRP platform. So Huawei router and switch may have the same issue. The redistributed is from IP routing table, not from bgp routing table, so we can’t filter according to communities.

END