On Fri, Jan 15, 2010 at 09:18:01AM +0800, Mark Tinka wrote: > Not quite - what I did say was: > > "We're aggregating 3x Gig-E links between both devices, and > it's working fairly well. Traffic distribution from the > M7i to the 6500 is 1:1:1, while traffic > distribution from the 6500 to the M7i is 1:1:0.7 (but this > direction is governed by other Layer 3 devices > upstream of the 6500)."
The 6500/7600 platform (or at least the current generation of cards) have only 8 hash buckets available, so if you use a non power-of-2 number of links like 3 above, what you're actually getting is 3:3:2. The problem gets worse as the number of active links increases, so that if you have 8 links at 1:1:1:1:1:1:1:1 and you lose one it becomes 1:1:1:1:1:1:2, effectively behaving like you only had 4 links instead of 7 (well, at least if you care about delivering half the packets on that 7th link at any rate). I'm not aware of any major router vendor who still sells a product with anything even beginning to approach this level of BAD. Juniper, Foundry, Extreme, Force 10, etc, all have this pretty much nailed down. -- Richard A Steenbergen <[email protected]> http://www.e-gerbil.net/ras GPG Key ID: 0xF8B12CBC (7535 7F59 8204 ED1F CC1C 53AF 4C41 5ECA F8B1 2CBC) _______________________________________________ juniper-nsp mailing list [email protected] https://puck.nether.net/mailman/listinfo/juniper-nsp
