I've stumbled across [what I think is] a strange issue involving the presence of a non-existent BGP route.
Prefix 10.31.251.128/28 used to be advertised into BGP by a remote site in this private network. A few days ago the subnet was removed and the route advertisement withdrawn. (it's no longer in the routing table or BGP table of the remote site) Despite this, the prefix still seems /somewhat/ present in BGP and is subsequently being redistributed into our IGP locally: SBNE002#sh ip ro 10.31.251.128 Routing entry for 10.31.251.128/28 Known via "bgp 64720", distance 130, metric 0 Tag 65530, type external Redistributing via ospf 1 Advertised by ospf 1 subnets tag 64700 Last update from 10.31.253.254 00:00:06 ago Routing Descriptor Blocks: * 10.31.253.254, from 10.31.253.254, 00:00:06 ago Route metric is 0, traffic share count is 1 AS Hops 5 Route tag 65530 SBNE002#sh ip bgp 10.31.251.128 255.255.255.240 BGP routing table entry for 10.31.251.128/28, version 79099 Paths: (0 available, no best path) Flag: 0x820 Not advertised to any peer AS 64720 is the local AS AS 65530 is another service provider's AS through which we reach some of our remote sites A 'clear ip route' on the offending subnet only caused it to reappear after a few seconds. I haven't done a soft clear on the neighbour yet. Any idea why the route is present in BGP but with 0 paths available? Regards, Brad _______________________________________________ cisco-nsp mailing list cisco-nsp@puck.nether.net https://puck.nether.net/mailman/listinfo/cisco-nsp archive at http://puck.nether.net/pipermail/cisco-nsp/