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Cisco Bug: CSCvu66701 - N7K: OSPF will not generate type 3 summary LSA

Last Modified

Oct 19, 2020

Products (2)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 7000 Series Switches

Known Affected Releases

7.3(2)D1(1)

Description (partial)

Symptom:
N7K: OSPF will not generate type 3 summary LSA when route is changing from External type-3 to normal type-3.

Conditions:
This problem is specific to dual home VPNV4 scenario. 
  
1. OSPF learns the prefix from BGP VPNV4(Downbit set) first.
2. Then if OSPF learn the same prefix without VPN(without DN bit set) later, old type 3 LSA will delete and new type 3 summary LSA for the prefix will not generate.
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Bug Details Include

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