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Cisco Bug: CSCut51575 - VPC breaks due to incorrect emulated switch-id after ISSU upgrade

Last Modified

Jul 18, 2018

Products (1)

  • Cisco Nexus 7000 Series Switches

Known Affected Releases

6.0(2)N2(3)

Description (partial)

Symptom:
Emulated switch-id changed to default value(2750) instead of configured one causing network connectivity issue. Software shows the correct switch-id.

Software:
`show vpc`
Legend:
		(*) - local vPC is down, forwarding via vPC peer-link

vPC domain id                     : 150 
vPC+ switch id                    : 2010--------------------------------------------->Correct value
Peer status                       : peer adjacency formed ok      
vPC keep-alive status             : peer is alive                 
vPC fabricpath status             : peer is reachable through fabricpath
Configuration consistency status  : success 
Per-vlan consistency status       : success                       
Type-2 consistency status         : success 
vPC role                          : secondary                     
Number of vPCs configured         : 85  
Peer Gateway                      : Disabled
Dual-active excluded VLANs        : -
Graceful Consistency Check        : Enabled
Auto-recovery status              : Enabled (timeout = 240 seconds)


`show platform fwm info l2mp myswid`
switch id
-------------------------------------------------------------------
  switch id manager
  -------------------------------------------------------------------
    vpc role: 0
    my primary switch id: 1011 (0x3f3)
    emu switch id: 2750 (0xabe)--------------------------------instead of 2010
    peer switch id: 1010 (0x3f2)

Conditions:
ISSU upgrade
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