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Cisco Bug: CSCsz34607 - unresolved route gets installed in URIB with recursive routes.

Last Modified

Jun 17, 2016

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

4.2(0.196)

Description (partial)

Symptom:

A Nexus 7000 may accept and install a recursive IPv4 or IPv6 route in
the RIB. The route will break forwarding for the prefix.
Conditions:

This can only occur when the network generates a looping route, and
this route's next-hop is directly attached, e.g.

  10.0.0.0/8, via 10.0.0.1, bgp
  10.0.0.0/24, via Ethernet0, direct

i.e. the 10.0.0.0/8 route is via 10.0.0.1, which is directly attached.

The following would be a valid route:

  10.0.0.0/8, via 10.0.0.1, bgp
  10.0.0.0/24, via 172.16.0.1, Ethernet0, ospf

i.e. here 10.0.0.1 resolves to 172.16.0.1 on Eth0.
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Bug Details Include

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  • Status
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