nanog mailing list archives
Re: Recommended L2 switches for a new IXP
From: Marian Ďurkovič <md () bts sk>
Date: Mon, 19 Jan 2015 11:12:28 +0100
On Sat, Jan 17, 2015 at 09:15:04PM +0200, Saku Ytti wrote:
On (2015-01-17 12:02 +0100), Marian Ďurkovič wrote:Our experience after 100 days of production is only the best - TRILL setup is pretty straightforward and thanks to IS-IS it provides shortest-path IP-like "routing" for L2 ethernet packets over any reasonable topology out of the box (without the burden and cost implications of VPLS).I'm not sure what the burden refers to, but cost implications to me seem same, trident HW can do VPLS.
Well, it can, but as usual the devil is in the detail. For example, loadbalancing on outgoing LAGs depends on *inbound* packet encapsulation as follows: - native ethernet, TRILL, L3 MPLS : hash based on L3 and L4 headers - L2 MPLS, MACinMAC : hash based on L2 headers only. Thus if you use VPLS or SPB-M on Trident HW, the egress PE doesn't support per-flow loadbalancing on IXP participants' LAGs. In any case, we preferred TRILL over SPB-M not just because of that, but mainly due to a fact that TRILL provides real routing using IS-IS as we know it from IP world, while SPB still builds on top of MST and just cleverly uses multiple trees. Yes, compatibility with existing ASICs was one of the main design goals of SPB, but that's irrelevant once you have Trident HW. Regards, M.
Current thread:
- Re: Recommended L2 switches for a new IXP, (continued)
- Re: Recommended L2 switches for a new IXP Chuck Anderson (Jan 15)
- Re: Recommended L2 switches for a new IXP Stephen R. Carter (Jan 13)
- Re: Recommended L2 switches for a new IXP Richard Hartmann (Jan 15)
- Re: Recommended L2 switches for a new IXP Stephen R. Carter (Jan 15)
- Re: Recommended L2 switches for a new IXP Martin Hannigan (Jan 12)
- Re: Recommended L2 switches for a new IXP Saku Ytti (Jan 17)
- Re: Recommended L2 switches for a new IXP Marian Ďurkovič (Jan 19)
- Re: Recommended L2 switches for a new IXP Nick Hilliard (Jan 19)
- Re: Recommended L2 switches for a new IXP Phil Bedard (Jan 19)
- Re: Recommended L2 switches for a new IXP Marian Ďurkovič (Jan 20)
- Re: Recommended L2 switches for a new IXP Phil Bedard (Jan 20)