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Author Topic: Hybrid Stack Question  (Read 2232 times)

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Offline gregorr

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Hybrid Stack Question
« on: May 10, 2013, 07:28:58 AM »
I have a hybrid stack consisting of 1 5650 (base unit) and 5 5520's, connected back to a core 5632 via 10G fiber.  My old fiber runs are having issues with 10g and I need to get them redundant while I upgrade the fiber. Can I use 1 of my 5520's fiber ports in this hybrid stack as my uplink ports?  I am not sure how VLACP will react.

Offline Johan Witters

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Re: Hybrid Stack Question
« Reply #1 on: May 10, 2013, 11:10:55 AM »
VLACP should pose no problems as long as you configure all switches/stacks to use the same VLACP MAC address...
Kind regards,

Johan Witters

Network Engineer

Offline Telair

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Re: Hybrid Stack Question
« Reply #2 on: May 13, 2013, 12:40:24 AM »
I really wouldn't try to mix 1Gig fibre and 10Gig fibre together in an MLT.  VLACP should be fine, but what I think you are asking to do has big red flashing warning signs saying don't do it.  If your old fibre plant can't take 10Gig speeds, can you make due with 2, 4 or up to 8 1Gig links from the 5520's?

We updated from 62.5 micron multimode fibre to 50 micron multimode in our data centre just to be able to support 10Gig fibre.  The old 62.5 micron "orange" fibre can work for 10Gig, but only over very short lengths.  I believe under 25 meters is it's maximum limit.  To get 200 - 300 meters out of 10Gig you need 50 micron or singlemode fibre.  I am thinking from here on out I am going to put both 50 micron multimode and a few singlemode strands to new build locations just so I don;t get screwed with fibre problems in the future.