AW: LAG vs MSTP for redundant switch links

Wayne Lunsford

2013-11-25 09:50:55 UTC

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Wayne
Hi James,

as Benjamin just stated.
Ill prefer Rapid Spanning Tree and configured additionally LACP. In a case you have 2xS4 at the core. Just configure VSB and LACP the edge Switches to the core ==> Loop-free.
But, still keep the Spanning-tree active.

Regards

Gradelain

Von: Benjamin Maze (Europe) [mailto:***@dimensiondata.com]
Gesendet: Montag, 25. November 2013 10:40
An: Enterasys Customer Mailing List
Betreff: RE: [enterasys] LAG vs MSTP for redundant switch links

Hi James,

The best choice is the Lag without any hesitation
LACP will ensure you a convergence time under 300ms which is quite transparent for your application
I thing that MSTP convergence take around 1s following the case of failure

The other benefit of LACP versus Spanning tree is the stability of the network. The spanning tree is often a source of big problem in case of loop in your network.

The spanning tree should be configured in addition of LACP (dont disable spanning tree on LACP link), that ensure a protection in case of an incident in LACP (like a bug)

Today, the best practice in network design is to avoid spanning tree

So, I recommend you to use LACP

Regards,

Benjamin Maze
Pre-Sales Engineer
Dimension Data France
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From: James Andrewartha [mailto:***@ccgs.wa.edu.au]
Sent: lundi 25 novembre 2013 02:58
To: Enterasys Customer Mailing List
Subject: [enterasys] LAG vs MSTP for redundant switch links

Hi list,

I'm setting up dual fibre links between our core and edge switches, and
was pondering whether to set up link aggregation or use MSTP to balance
the traffic across the links. My primary concern is for redundancy, not
extra bandwidth (I just checked cacti, and most don't sustain 100Mb/s).
How do MSTP and LACP compare for failover times?

The other thing about LACP is the config overhead of having to set the
aadminkey on the physical and LAG ports plus ensuring the VLANs match.
Whereas with MSTP I don't have to worry about the LAG port, and can just
set a port priority on the SID to balance the traffic if required.

I'm leaning towards MSTP, but every man and his dog seems to have a
spanning-tree meltdown story. All the switches will be Enterasys (S4 at
the core, B3/B5 at the edge) so you'd think it should all work fine.
Opinions?

Thanks,

--
James Andrewartha
Network & Projects Engineer
Christ Church Grammar School
Claremont, Western Australia
Ph. (08) 9442 1757
Mob. 0424 160 877

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