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Cisco Bug: CSCul22703 - N5K/6K: Upgrade between incompatible images can result in loss of config

Last Modified

Nov 27, 2020

Products (9)

  • CiscoPro Workgroup EtherSwitch Software
  • Cisco Nexus 5548P Switch
  • Cisco Nexus 5596UP Switch
  • Cisco Nexus 6004 Switch
  • Cisco Nexus 5020 Switch
  • Cisco Nexus 6001 Switch
  • Cisco Nexus 5548UP Switch
  • Cisco Nexus 5010 Switch
  • Cisco Nexus 5596T Switch

Known Affected Releases

5.2(1)N1(8a) 6.0(2)N2(1) 6.0(2)N2(4)

Description (partial)

After a disruptive upgrade between incompatible images following symptoms can be seen

1) Loss of FEX HIF configurations
2) Breakout configuration not applied
3) FC ports on unified ports not applied
4) Mgmt0 can also be in "shutdown force" if FEX HIFs had shutdown configured prior to upgrade.
5) VLAN database is lost when running VTP in client/server mode.

Seen in following scenarios

1)A disruptive upgrade is performed between incompatible images(install all command would have indicated that new version is incompatible with old version). Here is an example of the install process 
Compatibility check is done:
Module  bootable          Impact  Install-type  Reason
------  --------  --------------  ------------  ------
     1       yes      disruptive         reset  Incompatible image

Related Community Discussions

N5K upgrade 7.0(1) - %STP-2-DISPUTE
Has anyone experienced issues with a dual 5500 nexus chassis during nx-os upgrades ? (VPC, dual nics for servers &amp; all fancy stuffs)...   when upgrading to 7.0(1) - we had issues with the first switch losing its config (FEX interfaces etc) - which points to a bug... but as the first switch was coming up, all the servers with dual NICs connected to the 2nd switch also lost IP communication.. VPC's were up to the aggregation layer, but some kind of spanning tree disputes cropped up....   standard design: ...
Latest activity: Mar 05, 2015
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