12-02-2009 01:59 AM - edited 03-06-2019 08:47 AM
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
12-02-2009 02:47 AM
Hello Chandru,
what do you use for dual active detection?
see
http://www.cisco.com/en/US/partner/products/ps9336/products_tech_note09186a0080a7c837.shtml
and
Hope to help
Giuseppe
12-02-2009 03:03 AM
Hi,
I am using BFD for dual active detection.
12-02-2009 05:02 AM
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
12-02-2009 07:47 PM
12-02-2009 08:19 PM
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
12-02-2009 08:40 PM
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
12-03-2009 06:15 AM
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
11-29-2013 12:36 AM
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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