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Cisco Bug: CSCup94123 - ISSU:XE311->XE312 pseudo_wire VC status and LDP are down after RP SWO

Last Modified

May 16, 2018

Products (25)

  • Cisco IOS
  • Cisco ASR 901-6CZ-FS-D Router
  • Cisco ASR 901-6CZ-F-D Router
  • Cisco ME 3600X-24TS-M Switch
  • Cisco ASR 901-4C-FT-D Router
  • Cisco ASR 901S-4SG-F-D Router
  • Cisco ASR 901-6CZ-F-A Router
  • Cisco ASR 901S-2SG-F-AH Router
  • Cisco ASR 901S-2SG-F-D Router
  • Cisco ASR 901-6CZ-FT-A Router
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Known Affected Releases

15.4(1)S 15.4(2)S 15.4(3)S 15.5(1)S

Description (partial)

When performing an In-Service Software Upgrade ()ISSU) or a Stateful Switchover
(SSO), Any Transport over MPLS (AToM) xconnects may fail to come up.  The
output of <CmdBold>show mpls l2transport vc<noCmdBold> contains the following:

   Signaling protocol: LDP, peer unknown
     Targeted Hello: Id) ->, LDP is DOWN, no signaling

These symptoms have been observed when the Attachment Circuit is an ATM
Virtual Circuit (VC) or Virtual Path (VP), LDP Non-stop Routing (NSR) is
configured, and ISSU is performed from Cisco Version 15.4(1)S1 or later to any
later version, or SSO is performed on Cisco Version 15.4(1)S1 or later.
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Bug Details Include

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