Maximum distance for VSS and VSL

Unanswered Question
Feb 24th, 2010


Can someone tell me till how much distance can we have VSL,

I have 2 x 6509 serving as redundant switches and now i plan to upgrade to VSS, but both switch are 2KM away from each other.



I have this problem too.
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fly Tue, 12/13/2011 - 17:17

i have same question , no one answer me.

i have seen vss all in same location utill now!

i am interesting to implement vss in different location , about 50 km to 80 km distance.  but i haven't seen any real experience.

balbaletabrez Sun, 04/29/2012 - 07:55


At a distance of 2 Kms it did work .....for you it should work with ZR.

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Leo Laohoo Sun, 04/29/2012 - 15:38

I have a VSS pair and the distance is about 20 Km.  It works but I wouldn't recommend it. 

fly Fri, 07/27/2012 - 23:29

Hi Leo

  Why you didn't recommend it?

  Thank you


Leo Laohoo Sat, 07/28/2012 - 00:00
Why you didn't recommend it?

If, for example, the VSS will go into "split-brain" then you don't want to drive 20 Kms away just to give the 2nd unit a kick-in-the-guts.

Particularly, when the outage is severely disrupting services.

If I wanted a VSS pair, I want it to be no more than 50 metres away. 


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