6509 vss issue

Unanswered Question
Dec 2nd, 2009

     Hi all,

                     I configured 6509 VSS one of my customer,while chaecking failover. First i shut down the active switch traffic is going through secondary switch.Afterwards i restared active switch but that time secondary switch is also the reinsalaies all the port. Its takes 50 sec to come back so they consider that time down time.what might be the problem.

Thanks in advance

I have this problem too.
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Giuseppe Larosa Wed, 12/02/2009 - 05:02

Hello Chandru,

and you have a dedicated direct link for BFD packets to flow between the two switches?

I suppose you have the dedicated link

what IOS version is running on the VSS pair?

Hope to help

Giuseppe

Reza Sharifi Wed, 12/02/2009 - 20:19

In a VSS enviremnt, you should not have any down time at all.  I have tested this many times with no issues. The reason for your primary box rebooting is because you have preeamtion configure.

After looking at your config, one thing I suggest is that you should delete priority and preemption, save your config and test again.

HTH

Reza

chandru.j Wed, 12/02/2009 - 20:40

Hi,

  Here i need to clarfiy one thing primary is not rebooting.For failover testing i am shuting down the primary switch and checking the connectivity through ping form the server to router its happening fine.While powering up the primary switch again the secondary switch is rebooting.Now waht i have to do same as you said can i delete preempt and priority.Kindly let me know this.

Regards,

Chandru

Reza Sharifi Thu, 12/03/2009 - 06:15

Chandru,

Yes, remove priority and preemption

Make sure to SAVE the config.

Now reboot again and test.

In a scenario where you do not have priority and preemption, if you reboot both switches at the same time, switch-1 will always be the primary and switch-2 is the back up which you don't have access to make any config changes.

HTH

Reza

Swandip Ranjan Dhar Fri, 11/29/2013 - 00:36

Hi Guys,

I am also having the same problem...

We have seen issue when any of our VSL link goes the entire VSS pair goes down and even if the primary unit fails the secondary unit dont take over...

Another Q if the primary unity SUP fails will the secondary pair of  SUP engine will suport  the primary switch or the primary will be down that time.

Please check the attachment for our VSS config...

switch virtual domain 10

switch mode virtual

dual-active detection pagp trust channel-group 1

dual-active detection pagp trust channel-group 2

!

interface Port-channel101

no switchport

no ip address

no platform qos channel-consistency

switch virtual link 1

end

!

interface TenGigabitEthernet1/5/5

no switchport

no ip address

no cdp enable

channel-group 101 mode on

end

!

interface TenGigabitEthernet1/5/4

no switchport

no ip address

no cdp enable

channel-group 101 mode on

end

!

interface Port-channel102

no switchport

no ip address

no platform qos channel-consistency

switch virtual link 2

end

!

interface TenGigabitEthernet2/5/4

no switchport

no ip address

no cdp enable

channel-group 102 mode on

end

!

interface TenGigabitEthernet2/5/5

no switchport

no ip address

no cdp enable

channel-group 102 mode on

end

module provision switch 1

slot 1 slot-type 147 port-type 61 number 48  virtual-slot 17

slot 2 slot-type 147 port-type 61 number 48  virtual-slot 18

slot 3 slot-type 284 port-type 60 number 16  virtual-slot 19

slot 4 slot-type 284 port-type 60 number 16  virtual-slot 20

slot 5 slot-type 318 port-type 31 number 3 port-type 60 number 2  virtual-slot 21

slot 7 slot-type 156 port-type 31 number 24  virtual-slot 23

!

module provision switch 2

slot 1 slot-type 147 port-type 61 number 48  virtual-slot 33

slot 2 slot-type 147 port-type 61 number 48  virtual-slot 34

slot 3 slot-type 284 port-type 60 number 16  virtual-slot 35

slot 4 slot-type 284 port-type 60 number 16  virtual-slot 36

slot 5 slot-type 318 port-type 31 number 3 port-type 60 number 2  virtual-slot 37

#show switch virtual lin

VSL Status : UP

VSL Uptime : 4 weeks, 6 hours, 30 minutes

VSL SCP Ping : Pass

VSL ICC Ping : Pass

VSL Control Link : Te1/5/4 

VSL Encryption : Configured Mode - Off, Operational Mode - Off

#show switch virtual link port-channel

Group  Port-channel  Protocol    Ports

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

101    Po101(RU)        -        Te1/5/4(P)     Te1/5/5(P)    

102    Po102(RU)        -        Te2/5/4(P)     Te2/5/5(P) 

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