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Cisco Bug: CSCuo28697 - OSPFv3 continuous SeqNumberMismatch due to EXCHANGE options mismatch

Last Modified

Jul 20, 2018

Products (8)

  • Cisco Carrier Routing System
  • Cisco IOS XR Software
  • Cisco ASR 9922 Router
  • Cisco ASR 9010 Router
  • Cisco ASR 9904 Router
  • Cisco ASR 9006 Router
  • Cisco ASR 9001 Router
  • Cisco ASR 9912 Router

Known Affected Releases


Description (partial)

OSPFv3 neighbor flapping can be seen between ExStart and Exchange due to continuous SeqNumberMismatch.
This continuous SeqNumberMismatch is caused by the mismatch between options value in Database Description packets from a remote OSPFv3 router and corresponding neighbor options value in OSPFv3 process.

When a remote OSPFv3 neighbor supports and sets specific option values in Hello or Database Description packets. This problem will be seen when interoperating with other vendors.

Related Community Discussions

IOS-XR: OSPFv3 ネイバーの SeqNumberMismatch によるフラッピングが継続的に発生する
2014年10月22日(初版) TAC SR Collection    主な問題   IOS-XR が動作するルーターにおいて、対向 OSPFv3 ネイバーとの間で繰り返し SeqNumberMismatch が発生することにより ExStart と Exchange 間でフラッピングし、OSPFv3 ネイバーが UP しない事象が発生します。 原因 他ベンダーとの OSPFv3 接続において、対向 OSPFv3 ネイバーの Hello パケットもしくは Database Description パケットに下記表以外のオプションが設定されている場合に発生します。   | Option Value Description Reference 0x000001 V6-bit RFC5340 0x000002 E-bit RFC2328 0x000004 Deprecated RFC5340 0x000008 N-bit RFC3101 0x000010 R-Bit RFC5340 0x000020 DC-bit RFC1793 0x000040 Reserved for OSPFv2 migrated ...
Latest activity: Oct 21, 2014
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