VSS not reinstating after blackout

[Jorge F]

Hi gents,

I'm deploying a pair of 4500X in VSS mode for a new customer.

After preconfiguration phase and ascertaining I had a good VSS clustering in the LAB, I powered the pair down for final deployment but they would not come back up in VSS mode as expected when powered back on.

Well they would somehow but in SSO state or something similar, though they wouldn't see each other, and the VSL link would remain up/down.

Reverted them back to standalone and again into VSS, all fine, but after further power outages same thing, SSO state on each member, VSL link down and not a sign they wanted to get back to VSS.

Although these cores are not in production yet, I'm concerned they would behave this way upon programmed maintenance power outages.

Attached the config related and output to some commands.

Has anyone experienced anything similar? May this be relate to the fast hello absence or something?

[Leo Laohoo]

What supervisor card are these?

[Jorge F]

Please note these are 4500X Series:

Inventory

NAME: "Switch1 Supervisor 1 (virtual slot 1)", DESCR: "4500X-16 10GE (SFP+)"

PID: WS-C4500X-16      , VID: V03  , SN: JAE192801BJ

NAME: "Switch2 Supervisor 1 (virtual slot 11)", DESCR: "4500X-16 10GE (SFP+)"

PID: WS-C4500X-16      , VID: V03  , SN: JAE192802B5

////

Modules

Switch Number: 1 Role: Virtual Switch Active

Chassis Type : WS-C4500X-16

Power consumed by backplane : 0 Watts

Mod Ports Card Type                              Model              Serial No.

---+-----+--------------------------------------+------------------+-----------

1    16  4500X-16 10GE (SFP+)                   WS-C4500X-16       JAE192801BJ

2     8  10GE SFP+                              C4KX-NM-8          JAE19290BYS

M MAC addresses                    Hw  Fw           Sw               Status

--+--------------------------------+---+------------+----------------+---------

1 188b.9da8.e600 to 188b.9da8.e60f 1.1 15.0(1r)SG11 03.07.01.E       Ok

2 b0aa.777d.3188 to b0aa.777d.318f 1.0                               Ok

Mod  Redundancy role     Operating mode      Redundancy status

----+-------------------+-------------------+----------------------------------

1   Active Supervisor   SSO                 Active

Switch Number: 2 Role: Virtual Switch Standby

Chassis Type : WS-C4500X-16

Power consumed by backplane : 0 Watts

Mod Ports Card Type                              Model              Serial No.

---+-----+--------------------------------------+------------------+-----------

1    16  4500X-16 10GE (SFP+)                   WS-C4500X-16       JAE192802B5

2     8  10GE SFP+                              C4KX-NM-8          JAE19290BZK

M MAC addresses                    Hw  Fw           Sw               Status

--+--------------------------------+---+------------+----------------+---------

1 188b.9da8.ccc0 to 188b.9da8.cccf 1.1 15.0(1r)SG11 03.07.01.E       Ok

2 881d.fc5e.7fc8 to 881d.fc5e.7fcf 1.0                               Ok

Mod  Redundancy role     Operating mode      Redundancy status

----+-------------------+-------------------+----------------------------------

1   Standby Supervisor  SSO                 Standby hot

[Jorge F]

It seems there was a config mismatch between members as indicated by amber lights in one of them.

Erasin nvram in both and reworking the VSS config did the trick.