[j-nsp] load balancing in Route reflector scenario

[Humair Ali]

just to clarify ,

you have :

PE2 with 2 link , 1 to RR1 (let's call it link 1)  and 1 to RR2 (link 2)
PE3 with 2 link , 1 to RR1 (let's call it Link 3) and 1 to RR2  (link4)

you could set local pref to link to PE2 to 150 (RR1 to PE2 will be
preferred), and link 2 (PE2 to RR2) as standard 100
then set link 3 standard 100 (PE3 to RR1)  but set link 4 with 150  (RR2 to
PE3 will be preferred)

then RR1 has prefered path via PE2 (via link 1 high local pref), RR2 have
prefered path via PE3( via link 4 high local pref) , Each RR may advertise
both route to PE1

then on PE1 , u need load balancing configured , I can't guarantee either ,
but need to be tested.

On 10 August 2011 21:06, Stefan Fouant <sfouant at shortestpathfirst.net>wrote:

> Have you tried the advertise-inactive knob on the RR? I can't guarantee
> that this will work but it just might also advertise the route towards PE3
> as well.
>
> Of course, if this works, then you would need to enable multipathing on PE1
> accordingly.
>
> Stefan Fouant
> JNCIE-M, JNCIE-ER, JNCIE-SEC, JNCI
> Technical Trainer, Juniper Networks
> http://www.shortestpathfirst.net
> http://www.twitter.com/sfouant
>
> Sent from my iPad
>
> On Aug 10, 2011, at 2:44 PM, biwa net <biwa2go at gmail.com> wrote:
>
> > Dear All
> >
> > I have a setup where I need to load balancing routes received from 2 RR
> in
> > IPV4 environment (not VPN-IPV4)
> >
> > I have my  PE (let's called PE1) connected to 2 RR (cluster), my
> destination
> > subnet eg: 10.1.1.1/24 is behind 2 PE (PE-2 and PE3) which are also
> client
> > of the same 2RR
> >
> > PE-2 and PE3 are sending the same route 10.1.1.1/24 to the RR ,  which
> as
> > per normal behavior is selecting the best route to PE1  ,
> >
> > My issue is that RR is always advertising the route 10.1.1.1/24 through
> PE2
> > (due to lower router id) as best path and I would like to load balanced
> it
> > through PE2 and PE3
> >
> > Anyone can recommend a way to load balance ?
> >
> > Unfortunately I dont have a lab to test any solution and there are live
> > traffic on this ,so all I can do is guessing is whether the below 2
> option
> > would work or not.
> >
> > 2 option I have
> >
> > 1.So here I am trying to thinking about testing the multipath command
> under
> > the RR configuration  to see if I am receiving routes from both PE or not
> ,
> >
> > 2.  try to put all devices them in routing instance VRF , with the BGP
> > configuration under it (both RR and client) , and RD configured in the
> VRF
> > (but not putting any vpn family under bgp) so that it stays IPV4 routes ,
> > maybe I could cheat the RR to believe these are 2 differentes routes due
> to
> > the RD, but dont know if this works or not .
> >
> > anyone has had similar issue and found a workaround ?
> >
> > does the 2 option above actually work or not ?
> >
> > thanks for any input
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-- 
Humair