Cisco 4500X VSS Recovery Failing after VSL failure

[Moses Munguti]

Hi ,

I am running VSS on a pair of Cisco 4500X switches. Whenever VSL links fail, the VSS successfully initiates SSO where the previous Active switch goes into recovery-mode and all its ports remain AMBER. When I restore the VSL links, the switch in recovery-mode does not reload to become the Standby switch. The ports on the recovery-mode switch remain AMBER all through and the fast-hello port on the active switch remains in a "down" "down" state.

When I manually reload the recovery-mode switch, it reboots as the Standby switch.

Could this be a software bug ?

4500x details are:

cat4500e-universalk9.SPA.03.05.03.E.152-1.E3.bin

ROM: 15.0(1r)SG10

License Information for 'WS-C4500X-32'
    License Level: entservices   Type: Permanent
    Next reboot license Level: entservices

VSS:

VSS#SH SW VIR

Executing the command on VSS member switch role = VSS Active, id = 1

Switch mode                  : Virtual Switch
Virtual switch domain number : 10
Local switch number          : 1
Local switch operational role: Virtual Switch Active
Peer switch number           : 2
Peer switch operational role : Virtual Switch Standby

Executing the command on VSS member switch role = VSS Standby, id = 2

Switch mode                  : Virtual Switch
Virtual switch domain number : 10
Local switch number          : 2
Local switch operational role: Virtual Switch Standby
Peer switch number           : 1
Peer switch operational role : Virtual Switch Active

VSS#show switch virtual dual-active summary

Executing the command on VSS member switch role = VSS Active, id = 1

Pagp dual-active detection enabled: Yes
FastHello dual-active detection enabled: Yes
In dual-active recovery mode: No

Executing the command on VSS member switch role = VSS Standby, id = 2

Pagp dual-active detection enabled: Yes
FastHello dual-active detection enabled: Yes
In dual-active recovery mode: No

VSL LINKS

interface TenGigabitEthernet1/1/32
 description == VSS FAST HELLO ==
 switchport mode access
 switchport nonegotiate
 dual-active fast-hello

interface TenGigabitEthernet2/1/32
 description == VSS FAST HELLO ==
 switchport mode access
 switchport nonegotiate
 dual-active fast-hello

[Reza Sharifi]

Hi,

That is normal behavior.  The switch in recovery mode doesn't reboot on it own.  You have to reboot it manually.

HTH

[dcamarotto]

Hi Reza,

            Can you tell if Cisco today has a command that causes the 4500x switch to auto-recover? I believe that this behavior of not having auto-recovery only happens with the 4500x switches.

[Ario M. Fanie]

if you want the peer to do auto reboot, please ensure during active standby synchronization have same synchronization. To do that from active core switch save the config and it will sync to the standby switch.. Usually if you need to do manual reboot on the recovery mode because it does not have the same config.