CEF uses per-destination loadbalancing in a round-robin fashion.
Marcio Pilotto
-----Original Message-----
From: Andrew [mailto:arousch@home.com]
Sent: segunda-feira, 14 de agosto de 2000 16:16
To: cisco-nsp@puck.nether.net
Cc: cisco-nsp@puck.nether.net
Subject: Re: Per-destination loadbalancing
cef uses destination by default.
At 05:05 PM 7/25/00 +0200, Jesper Skriver wrote:
>On Tue, Jul 25, 2000 at 10:33:34AM -0400, De Troch, Bruno wrote:
> > Does anyone knows how per-destination loadbalancing is done on 7513
> with cef
> > enabled?
> > Suppose I have 2 static routes defined on 2 equal speed serial links. Is
it
> > possible to predict which link will be chosen if I know source and
> > destination ip addresses/subnets?
>
>No, it depends on the source/destination addressed hashed into some hash
>buckets, as you can see below it depends on which hash bucket the source
>address fall's into.
>
>aegnxt1#sh ip cef 195.249.0.37 internal
>195.249.0.37/32, version 79480, per-destination sharing
>0 packets, 0 bytes
> tag information set, shared
> local tag: 71
> via 195.249.6.254, Serial1/7:1, 28 dependencies
> traffic share 1
> next hop 195.249.6.254, Serial1/7:1
> valid adjacency
> tag rewrite with Se1/7:1, point2point, tags imposed: {}
> via 195.249.6.250, Serial1/6:1, 27 dependencies
> traffic share 1
> next hop 195.249.6.250, Serial1/6:1
> valid adjacency
> tag rewrite with Se1/6:1, point2point, tags imposed: {}
>
> 0 packets, 0 bytes switched through the prefix
> tmstats: external 0 packets, 0 bytes
> internal 0 packets, 0 bytes
> Load distribution: 0 1 0 1 0 1 0 1 0 1 0 1 0 1 0 1 (refcount 56)
>
> Hash OK Interface Address Packets Tags
imposed
> 1 Y Serial1/7:1 point2point 0 none
> 2 Y Serial1/6:1 point2point 0 none
> 3 Y Serial1/7:1 point2point 0 none
> 4 Y Serial1/6:1 point2point 0 none
> 5 Y Serial1/7:1 point2point 0 none
> 6 Y Serial1/6:1 point2point 0 none
> 7 Y Serial1/7:1 point2point 0 none
> 8 Y Serial1/6:1 point2point 0 none
> 9 Y Serial1/7:1 point2point 0 none
> 10 Y Serial1/6:1 point2point 0 none
> 11 Y Serial1/7:1 point2point 0 none
> 12 Y Serial1/6:1 point2point 0 none
> 13 Y Serial1/7:1 point2point 0 none
> 14 Y Serial1/6:1 point2point 0 none
> 15 Y Serial1/7:1 point2point 0 none
> 16 Y Serial1/6:1 point2point 0 none
>
>
>/Jesper
>
>--
>Jesper Skriver, jesper(at)skriver(dot)dk - CCIE #5456
>Work: Network manager @ AS3292 (Tele Danmark DataNetworks)
>Private: Geek @ AS2109 (A much smaller network ;-)
>
>One Unix to rule them all, One Resolver to find them,
>One IP to bring them all and in the zone to bind them.
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