From: ying chang (ying_c@xxxxxxxxxxx)
Date: Mon Mar 25 2002 - 00:28:11 GMT-3
Hi,
The problem is solved without using any static routes or "bgp bestpath
as-path ignore". What I ended up to do is to have R1 have two neighbors to
both R2's interfaces. Similarly, R2 have two neighbors to both R1's serial
interfaces. By doing this way, As3 is no longer used in route selection but
just providing routes between R1 and R2 by broadcast DMZ to both R1 and R2.
No AD or metrics adjustment are needed, as this setup pretty much eliminate
R3 from the picture altogher.
Thanks,
Chang
>From: "ying chang" <ying_c@hotmail.com>
>Reply-To: "ying chang" <ying_c@hotmail.com>
>To: nsalvato@cisco.com, ccielab@groupstudy.com
>Subject: RE: bgp load balancing
>Date: Sun, 24 Mar 2002 21:10:37 -0500
>
>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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