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Cisco Bug: CSCut66044 - bgp does not update the nexthop ifhandle correctly

Last Modified

Jan 08, 2017

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.3.ROUT

Description (partial)

Symptom:
When you have dynamic route leaking feature enabled under bgp (import routes from default to non-default vrf), for directly connected routes which are edistributes from rib to bgp in default, bgp will import those routes to non-default vrf then install them to rib.

When do show route vrf <foo> for those routes, you might see The problem is that the directly connected routes (imported routes) are being displayed as "fallback routes in default-vrf".

B    148.103.12.0/24 is directly connected, 5d17h route fallback in vrf default

If the line card is not support Fallback, the following message will show up.

#135527:    :LC/0/5/CPU0:Mar  3 09:54:00.526 2015:fib_mgr[177]: Fallback VRF is not supported on this Linecard:shldi ctx 0
#135528:    :LC/0/5/CPU0:Mar  3 09:54:00.526 2015:fib_mgr[177]: Fallback VRF is not supported on this Linecardlwldi ctx a9452f70

Conditions:
If the nexthop in bgp for default table is first created already without ifhandle (for example local RT NLRI get created first with 0.0.0.0 nexthop, or redistributed ospf or static routes with non-ifhandle for nexthop 0.0.0.0 etc), then you might see this issue for dynamic  route leaking feature.
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