From: Scott Morris (swm@emanon.com)
Date: Sat Nov 13 2004 - 06:27:44 GMT-3
The load balancing done with multipath is still handled via your
switching/caching method. Which means it's more of a flow-based balancing.
So when one flow chooses one path, it will go via that path the whole time.
I don't believe the docs state per-packet load balancing at all... That
would be bizzarre.
Check out:
http://www.cisco.com/en/US/tech/tk365/tk80/technologies_tech_note09186a00800
94431.shtml#bgpmpath
And more general:
http://www.cisco.com/en/US/tech/tk365/tk80/technologies_tech_note09186a00800
94820.shtml
HTH,
Scott Morris, MCSE, CCDP, CCIE4 (R&S/ISP-Dial/Security/Service Provider)
#4713, JNCIP, CCNA-WAN Switching, CCSP, Cable Communications Specialist, IP
Telephony Support Specialist, IP Telephony Design Specialist, CISSP
CCSI #21903
swm@emanon.com
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
libone mhlanga
Sent: Friday, November 12, 2004 6:21 PM
To: Jim Devane; ccielab@groupstudy.com
Subject: RE: RE : BGP Gurus out there !!
Well Cisco says it will load-balance however it does not mean that it has
not selected the best route which it will advertise to its neighbor
....unless I misread it !!
----- Original Message -----
From: "Jim Devane" <jim@powerpulse.cc>
To: "'libone mhlanga'" <libone@lycos.com>, <ccielab@groupstudy.com>
Subject: RE: RE : BGP Gurus out there !!
Date: Fri, 12 Nov 2004 14:56:45 -0800
>
> It will pick the single best route according to the BGP algorithm.
> Maximum-paths has nothing to do with the scenario you are suggesting.
>
> Peter, advice is excellent. You probably should not be trying to
> per-packet load balance over the internet. Per-destination could be
another argument.
>
> I am up to .04 for the day...not sure how much more I can afford. ;)
>
> jim
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf
> Of libone mhlanga
> Sent: Friday, November 12, 2004 2:37 PM
> To: ccielab@groupstudy.com
> Subject: Re: RE : BGP Gurus out there !!
>
> hmmm I am not sure what answer to go for here so let me try and
> re-phrase the question again :-
>
> a) I am in ASx and I have rtrA connected ASy and rtrB connected to ASz
> b) I advertise the same prefix to both AS's
>
> What will a router in ASyz (an AS thats connected to both ASy and ASz)
> that has "maximum-paths" configured do ?
>
> ----- Original Message -----
> From: Richard Dumoulin <Richard.Dumoulin@vanco.fr>
> To: ccielab@groupstudy.com
> Subject: RE : BGP Gurus out there !!
> Date: Fri, 12 Nov 2004 21:54:23 -0000
>
> >
> > Also would not load sharing be a more appropriate term ?
> >
> >
> > -----Message d'origine-----
> > De : Peter Van Oene [mailto:petvan@gmail.com] Envoyi : Friday,
> > November 12, 2004 10:20 PM @ : ccielab@groupstudy.com Objet : Re:
> > BGP Gurus out there !!
> >
> > Doing so will create tremendous out of order packet delivery,
> > assuming you split flows. I'd suggest that you really don't want to do
this.
> >
> >
> > On Fri, 12 Nov 2004 15:58:42 -0500, Brian McGahan
> > <bmcgahan@internetworkexpert.com> wrote:
> > > > As well, wouldn't CEF be responsible for the per-packet
> > > > balancing, not
> > > BGP
> > > > per se? I am not sure of that, but I would think that the
> > > > switching
> > > engine
> > > > would be more in charge than the routing protocol.
> > >
> > > It's BGP job to install the route (or routes) in the
> > > routing table. The actual load balancing is done through the
> > > switching process such as CEF, fast switching, etc.
> > >
> > >
> > >
> > > Brian McGahan, CCIE #8593
> > > bmcgahan@internetworkexpert.com
> > >
> > > Internetwork Expert, Inc.
> > > http://www.InternetworkExpert.com
> > > Toll Free: 877-224-8987 x 705
> > > Outside US: 775-826-4344 x 705
> > > 24/7 Support: http://forum.internetworkexpert.com
> > > Live Chat: http://www.internetworkexpert.com/chat/
> > >
> > > > -----Original Message-----
> > > > From: Jim Devane [mailto:jim@powerpulse.cc]
> > > > Sent: Friday, November 12, 2004 2:53 PM
> > > > To: Brian McGahan; 'libone mhlanga'; ccielab@groupstudy.com
> > > > Subject: RE: BGP Gurus out there !!
> > > >
> > > > Hmm,
> > > >
> > > > But I believe the original question is to load-balance to two
> > > different
> > > > AS's... which is not possible right now. ( I can't have 701 and
> > > > 1239 hooked to my router and load balance to some AS they are
> > > > both connected to )
> > > >
> > > > It would be great to have this in practice. But BGP is really
> > > > set on making one single best choice for the route.
> > > >
> > > > As well, wouldn't CEF be responsible for the per-packet
> > > > balancing, not
> > > BGP
> > > > per se? I am not sure of that, but I would think that the
> > > > switching
> > > engine
> > > > would be more in charge than the routing protocol.
> > > >
> > > > My .02
> > > >
> > > > Jim
> > > >
> > > >
> > > > -----Original Message-----
> > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > > > Behalf
> > > Of
> > > > Brian McGahan
> > > > Sent: Friday, November 12, 2004 10:28 AM
> > > > To: libone mhlanga; ccielab@groupstudy.com
> > > > Subject: RE: BGP Gurus out there !!
> > > >
> > > > Li,
> > > >
> > > > Yes you can do this. In order to do this issue the
> > > > "maximum-paths" command under the BGP process. Note that the
> > > > best
> > > path
> > > > selection must match for all the attributes up to the IGP metric.
> > > >
> > > > For more info see:
> > > > http://www.cisco.com/warp/public/459/25.shtml
> > > >
> > > >
> > > > HTH,
> > > >
> > > > Brian McGahan, CCIE #8593
> > > > bmcgahan@internetworkexpert.com
> > > >
> > > > Internetwork Expert, Inc.
> > > > http://www.InternetworkExpert.com Toll Free: 877-224-8987 x 705
> > > > Outside US: 775-826-4344 x 705
> > > > 24/7 Support: http://forum.internetworkexpert.com
> > > > Live Chat: http://www.internetworkexpert.com/chat/
> > > >
> > > >
> > > > > -----Original Message-----
> > > > > From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On
> > > > > Behalf
> > > > Of
> > > > > libone mhlanga
> > > > > Sent: Friday, November 12, 2004 9:17 AM
> > > > > To: ccielab@groupstudy.com
> > > > > Subject: BGP Gurus out there !!
> > > > >
> > > > > Is it possible for BGP to do per-packet load-balancing to two
> > > > different AS
> > > > > numbers ? Put another way does BGP now have the ability to
> > > > > install
> > > > two
> > > > > routes in the routing table to the same prefix without
> > > > > preferring
> > > one
> > > > over
> > > > > the other ?
> > > > >
> > > > > Thanks,
> > > > >
> > > > > Li
> > > > > --
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