From: ying chang (ying_c@xxxxxxxxxxx)
Date: Sun Mar 24 2002 - 23:10:37 GMT-3
Hi Nelson,
Not only do we have to adjust the metrics, the administrative distance also
needs to be adjusted as well so we can have two equal paths.
"maximum-paths 2" is needed, but after thinking it over, I don't think "bgp
bestpath as-path ignore" will help. Even if we ignore the as-path, the bgp
selection process will have other tie-breakers to select the best path, so
there will be only one path after the selection process, instead of the two
paths that we would like. Please correct me if I'm wrong. I'm not sure if
static route is the only choice for this question, but that's what I can
come up with and that works for now.
Thanks,
Chang
>From: "Nelson Salvatorelli" <nsalvato@cisco.com>
>To: "ying chang" <ying_c@hotmail.com>, <ccielab@groupstudy.com>
>Subject: RE: bgp load balancing
>Date: Mon, 25 Mar 2002 01:27:27 -0000
>
>Hi,
>
>Not only you have to configure 'bgp bestpath as-path ignore' but also
>'maximum-paths 2'. The latter if used in iBGP, will only be available
>from 12.2S. 12.2S is not out yet. In your case should work since it is
>eBGP... And multipath support is available for eBGP since 11.3 If I
>remember correctly.
>
>It's worth a try in the lab... I guess if you adjust the metrics
>accordingly (to make them all equal) and ignore the AS_PATH attr, then
>it should work nicely...
>
>Good question!
>Cheers,
>
>-nelson
>
>
> > -----Original Message-----
> > From: ying chang [mailto:ying_c@hotmail.com]
> > Sent: 25 March 2002 00:52
> > To: ccielab@groupstudy.com
> > Subject: Re: bgp load balancing
> >
> >
> > Hi,
> >
> > Well, "bgp bestpath as-path ignore" is not available on my
> > routers (IOS
> > 12.1.11, 12.1.12, 12.0.20) even Cisco's CDROM said it was
> > introduced in
> > 12.0. So, is it still possible to use the direct link along
> > with a transit
> > AS to do load balancing?
> >
> > Thanks,
> > Chang
> >
> >
> > >From: "ying chang" <ying_c@hotmail.com>
> > >Reply-To: "ying chang" <ying_c@hotmail.com>
> > >To: ccielab@groupstudy.com
> > >Subject: bgp load balancing
> > >Date: Sun, 24 Mar 2002 19:23:14 -0500
> > >
> > >Hi,
> > >
> > >Can we load balancing R1 and R2 traffic using both R1-R2 and R1-R3-R2
> > >links?
> > >My thought is if we ignore as-path then R1-R3-R2 path should
> > be as good as
> > >R1-R2 path, but I'm not 100% sure.
> > >
> > > R1 (AS1, net 1.0.0.0)
> > > / \
> > > / \
> > > / \
> > > R2-----R3 (AS3, net 3.0.0.0)
> > > (AS2, net 2.0.0.0)
> > >
> > >Thanks,
> > >Chang
> > >
> > >
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