Re: Per-destination loadbalancing

From: Jesper Skriver (jesper@skriver.dk)
Date: Tue Aug 01 2000 - 12:38:45 EDT


So thought I, but as you can see below it doesn't quite work like that.

/Jesper

On Mon, Jul 31, 2000 at 11:20:28AM -0500, Andrew wrote:
> 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.
>

/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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