Re: BGP load balancing using Loopbacks.

Thanks Marko
My question is about using unequal load sharing in EIGRP to achieve BGP
unequal load sharing in simple topology like this one:

(AS11)RA======EIGRP======RB(AS10)

Two eBGP neighbors establish peering using loopback interfaces. Each router
learns about other loopback via EIGRP.

Assuming that:
a. Two links between RA and RB are NOT equal
b. EIGRP is properly configured for unequal load balancing
c. BGP uses other routers loopback address as next hop

will BGP traffic be load shared as well? I think that yes, because BGP uses
other loopback address as Next Hop and this Next Hop is unequally load
shared using EIGRP.

Just asking because Cisco article:
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf1
implies that equal cost links are required.

On Tue, Apr 26, 2011 at 4:10 PM, Marko Milivojevic <markom_at_ipexpert.com>
wrote:
>
> Equal-cost load-sharing does not require any special configuration.
> Unequal load sharing does and it doesn't happen automatically. While
> yes, the limit for unequal-cost load sharing may be 16, for equal-cost
> it's 6 by default (even though this may be platform and IOS
> dependent). It can be changed with "maximum-paths" under EIGRP
> process.
>
> --
> Marko Milivojevic - CCIE #18427
> Senior Technical Instructor - IPexpert
>
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>
> On Tue, Apr 26, 2011 at 12:56, Jacek <q.192.168.1.0_at_gmail.com> wrote:
> > Hello all,
> >
> > I am referring to Cisco article:
> >
> >
http://www.cisco.com/en/US/tech/tk365/technologies_configuration_example09186a00800945bf.shtml#conf1
> >
> > RA(AS11)======EIGRP======RB(AS10)
> >
> > Peering is done using loopback interfaces.
> > RA and RB run EIGRP and advertise Loopbacks and connecting links.
> > Load balancing between loopback interfaces is assured by EIGRP.
> >
> > My question is about Cisco statement:
> > "This scenario shows how to achieve load sharing when there are multiple
*(up
> > to a maximum of six), equal-cost links*."
> >
> > Why there is a limit of 6 links and why they need to be equal ?
> > I think that any limits in this scenario are imposed by EIGRP and EIGRP
> > supports unequal load balancing up to 16 links.
> >
> > Thanks,
> >
> >
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Received on Tue Apr 26 2011 - 21:51:30 ART