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List:       cisco-nsp
Subject:    Re: Per-destination loadbalancing
From:       Andrew <arousch () home ! com>
Date:       2000-07-31 16:21:57
[Download RAW message or body]

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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