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New Member

Cisco 4500 VSS link issue



We are having Cisco 4500 switches running in VSS mode. Currently VSS links are connected on ports with capacity of 1 GB & we wanted to replace those ports with new 10 GB DAC cable.


We manage this switch remotely via SSH. If we disable VSS link or broke the VSS between 2 switches , is it still possible to access  switches over SSH ?

or we need someone near to device for Console session ?


Thanks in advance.

Cisco Employee

It depends on how the setup

It depends on how the setup is.

If you have the devices access through the  console server then you should be able to access the box.

Reason: When you bring down the VSL link the dua active condition triggered. 

Switch 1 detects that switch 2 is now also active triggering dual active 
condition thus switch 1 brings down all the local interfaces to avoid network 
instability. Until VSL link restoration occurs, switch 1 is isolated from the 
 Once the VSL link comes up, the role negotiation determines that switch 1 
needs to come up in STAND_BY mode hence it reboots itself; finally, all 
interface on switch 1 are brought on line and switch 1 assumes STAND_BY role.





VIP Super Bronze

Hi,Once you pull out the


Once you pull out the second VSL link, the switch will go into the dual active detection and the primary switch (switch-1) will reboot.  Now you can access switch-2 remotely, but since you are changing the VSL links from 1Gig to 10Gig then switch-1 should be able to recognize it because it is in the process of rebooting, but not sure is switch-2 will.

I think, for this you need someone with console cable near the switches just in case.