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S-series : Suboptimal OSPF routing after wrong 7-to-5 conversion - Forwarding address not populated

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TitleS-series : Suboptimal OSPF routing after wrong 7-to-5 conversion - Forwarding address not populated
Symptoms
NSSA ABR’s translating Type 7 to Type 5 LSA seems to lose the Forwarding address
Some networks show the problem and some don’t but there does not seem to be any difference between the networks
 
(su)->sh ip ospf database external 172.18.0.0

Displaying External Advertisements
LS age: 1544
Options: No TOS-capability, E
LS Type: AS External Links
Link State ID: 172.18.0.0
Advertising Router: 10.211.251.148
LS Seq Number: 80000db9
Checksum: 0x9547
Length: 24
Network Mask: 255.255.248.0
Metric type 2 external (larger than any link state path)
TOS: 0 Metric: 10
Forwarding Address: 0.0.0.0   -------- Forwarding Address is missing here !!!!!!
External Route Tag: 0
Number of TOS metrics: 0

 
Environment
  • S-Series
  • Firmware 8.42.xx
  • OSPF
  • Type 7 LSA
  • Type 5 LSA
Cause
At times NSSA ABR’s translating Type 7 to Type 5 LSA loses the Forwarding address.
Resolution
Upgrade to Firmware Version 08.62.02
Additional notes

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