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Cisco Bug: CSCuq34450 - DN bit not set with certain sequence of events

Last Modified

Sep 10, 2019

Products (5)

  • Cisco Nexus 7000 Series Switches
  • Cisco Nexus 7000 10-Slot Switch
  • Cisco Nexus 7000 4-Slot Switch
  • Cisco Nexus 7000 18-Slot Switch
  • Cisco Nexus 7000 9-Slot Switch

Known Affected Releases

6.1(4a)

Description (partial)

The extended communities added by bgp are missing in urib database

Symptom:
In VRF-lite or MPLS VPN with OSPF as PE-CE protocol, OSPF routes may get injected back to the OSPF domain without setting the DN bit. IF you have backdoors, other sites may redistribute this OSPF route without DN bit back to MP-BGP and may cause a routing loop.

Conditions:
In VRF-lite or MPLS VPN with OSPF as PE-CE protocol
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  • Status
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