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Author Topic: VLACP or MLT trunk between IDFs?  (Read 603 times)

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Offline jahyde

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VLACP or MLT trunk between IDFs?
« on: July 08, 2017, 05:56:33 PM »
Just want some insight on best setup to trunk IDF back to MDF.

MDF: 3 stack of 5530/5520 >>

4 ethernet cables to the IDF (they didnt run fiber:()
1/1-2,2/1-2 on each stack. >>

IDF: 2 stack of 5520

I dont plan on any sort of cluster, just need bandwidth/fault tolerance. Should I just use VLACP, or should I have MLT on top of VLACP.

I have read this article, but still gray on the matter-
https://blog.michaelfmcnamara.com/2012/03/is-vlacp-right-for-me/


Offline TankII

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Re: VLACP or MLT trunk between IDFs?
« Reply #1 on: July 10, 2017, 10:07:39 AM »
Clarification points:
VLACP is a fault detection system - it can traverse other layer-1 devices such as Ciena gear.  It is not a trucking mechanism.
LACP is the Industry standard for dynamic trunk groups.  If you enable LACP, you can add and remove ports from a trunk group dynamically.
MLT is a proprietary name for Static trunk grouping, similar to GEC from Cisco.

For your project, I would run an MLT, and avoid VLACP.  You do not have another device in the middle, intercepting/interpreting/retransmitting the layer-1 data.
Keep it simple.
If you want to add more ports in the future, then by all means, build both sides as LACP ports, and as you plug each one in, you will see the MLT grow.
I did extensive testing of LACP to Linux boxes in 2008 for the Novell guys when they were converting to SLES.  Spent hours, and got some pretty good, repeatable results back.

TankII

Offline jahyde

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Re: VLACP or MLT trunk between IDFs?
« Reply #2 on: July 10, 2017, 06:37:05 PM »
ok... for some reason I was thinking VLACP was some sort of advanced LACP protocol... so my question is more LACP vs MLT.

So I just made a MLT trunk on 2 ports, found out that 2 of my 4 cables were being used for something else off-net. I guess this does not give me any fault tolerance without LACP? or what is the lacking feature of MLT without LACP?


Offline TankII

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Re: VLACP or MLT trunk between IDFs?
« Reply #3 on: July 10, 2017, 07:35:16 PM »
Other than to add/remove ports from the trunk group requires you to disable it (MLT) they do the same thing and use the same overflow-to-next-port dikstra algorithm.

TankII