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If your message was personal or of a "non-urgent" nature, I'll reply as soon as I can. Wayne >>> "Schoenfeld, Kevin" <[email protected]> 11/26/13 08:59 >>> Be warned, depending on the platform you are using - the outportAlgorithm for LACP options change. We recently moved to 7100 top of rack switches (from an N7) and surprisingly, the newer switches do not support round-robin - which would minimize benefit on your backup example. Kevin Schoenfeld IT Services Hobart and William Smith Colleges 315-781-3711 [email protected]<mailto:[email protected]> From: Jolie, David [mailto:[email protected]] Sent: Monday, November 25, 2013 9:09 AM To: Enterasys Customer Mailing List Subject: Re: [enterasys] LAG vs MSTP for redundant switch links As noted in a prior e-mail, Link Aggregation path selection can sometimes favor one path so it is important to understand traffic flow in your network when configuring the distribution algorithm. By default on S-series the path selection is based on a hash of the Destination IP - Source IP (DIP-SIP) pairings. This normally results in a pretty fair distribution of traffic but, in the case of a single server sending a ton of traffic to a single destination (i.e. the backup example mentioned earlier), all that traffic would take a single path since it's a single DIP/SIP pair. For S-series you can choose an alternate distribution method as follows: set lacp outportAlgorithm {dip-sip | da-sa | round-robin} Also note that the distribution method effects only traffic leaving the switch in question - you need to configure both ends of the LAG or you may still see unequal traffic distribution. By contrast, with MSTP you only get a single path (one per VLAN if configured that way) and you don't have the option for round-robin with MSTP... Cheers, Dave J David Jolie ECE-Networking, ECE-Network Security Solutions Engineer Extreme Networks Cell: +1.978.436.0726 On Mon, Nov 25, 2013 at 4:50 AM, Gradelain Ngouni <[email protected]<mailto:[email protected]>> wrote: Hi James, as Benjamin just stated. I'll 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:[email protected]<mailto:[email protected]>] 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 (don't 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 Tel: +33 1 4975 8626<tel:%2B33%201%204975%208626> Mob: +33 6 6025 6678<tel:%2B33%206%206025%206678> Fax: +33 1 4975 8629<tel:%2B33%201%204975%208629> [email protected]<mailto:[email protected]> Zone Orlytech - 20 avenue Louis Blériot (adresse postale 91781 Wissous Cedex), Paray Vieille Poste, 91550, France. Dimension Data is an NTT Group company. For further information about Dimension Data, please go to www.dimensiondata.com<http://www.dimensiondata.com/> Follow us on Social Media Blog<http://blog.dimensiondata.com> Facebook<http://www.facebook.com/pages/Dimension-Data-Europe/208242309194429> LinkedIn<http://www.linkedin.com/company/dimension-data> Twitter<http://twitter.com/DimensionData> P please consider the environment before printing this email [cid:[email protected]] [Dimension Data launches Cloud Services]<http://eucloud.dimensiondata.com/> From: James Andrewartha [mailto:[email protected]] 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 --- To unsubscribe from enterasys, send email to [email protected]<mailto:[email protected]> with the body: unsubscribe enterasys [email protected]<mailto:[email protected]> itevomcid * --To unsubscribe from enterasys, send email to [email protected]<mailto:[email protected]> with the body: unsubscribe enterasys [email protected]<mailto:[email protected]> Gradelain Ngouni Dipl. -Ing. 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