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Some access points do not establish backup tunnel

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TitleSome access points do not establish backup tunnel
Symptoms
  • Some-access-points-do-not-establish-backup-tunnel
  • HA mode doesn't work
  • No Backup tunnel established
Environment
  • W786C-2IA-RJ45
  • AP3865e
  • C5210
  • 9.21.08.0013
  • Other AP types could be also affected
Cause
  • Propagating tunnel state to the peer doesn't work
  • backup tunnel affected after upgrade
  • No backup tunnel can be established
Resolution

         FW Upgrade to or greater
  • 09.21.16
  • 10.11.06
  • 10.21.03
  • 10.31.01
Release Note: wns0017187 Corrected issue with propagation of AP tunnel state to peer Controller in HighAvailability (HA), which could cause APs to fail in establishment of backup tunnel.

        Workaround
  • To set the AP to factory default doesn't solve the issue
  • Only to kill the process on the EWC or reboot the Controller get the backup tunnel up back.
Additional notes

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