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Cisco Bug: CSCuj23176 - XR510: VRF connected routes adv'd by ISIS if intf conf'd under ISIS

Last Modified

Jun 08, 2018

Products (1)

  • Cisco ASR 9000 Series Aggregation Services Routers

Known Affected Releases

5.1.0.BASE

Description (partial)

Symptom:
Connected network from a VRF are advertised by ISIS creating a routing loop between the source router and its peers for those connected networks.

Conditions:
If an interface is configured for a VRF and also configured under the ISIS process, ISIS will not care that the connected networks are part of a VRF and not in the global RIB and will advertise those networks to its peers.  The peers will install the prefixes in their global RIB and in turn readvertise those prefixes it their own peers, which includes the peer that sourced the networks.  The source router will get the advertisement from their peer with the connected networks but since they are part of a VRF they are not in the source router's global RIB.  Therefore the source router will install the networks as learned from it's peer, creating a routing loop.
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