[j-nsp] BGP and OSPF ECMP

[Marlon Duksa]

I tried this on MX960 and it seams that load balancing is on by default. How
do I turn load balancing off?
In the RT I can see both next hops:
2.2.2.2/32         *[OSPF/10] 02:21:29, metric 1
                      to 10.0.2.2 via ge-8/0/5.0
                    > to 10.0.3.2 via ge-5/1/0.0


In the FT I can see only one path:
2.2.2.2/32         user     1 10.0.3.2           ucst   572     5 ge-5/1/0.0

But when I actually send traffic and run 'monitor interface traffic', I see
that traffic is going out over both links.
This 2.2.2.2 next hop is actually a PE router in VPN.

Is load balancing on by default on MX? I didn't configure anything special
to turn it on.

On Tue, Jul 15, 2008 at 6:43 AM, Boyd, Benjamin R <
Benjamin.R.Boyd at windstream.com> wrote:

> You can further control the flow with:
>
> [edit forwarding-options hash-key]
>
> family inet {
>    layer-3;
>    layer-4;
> }
> family mpls {
>    label-1;
>    label-2;
> }
>
> If you're load balancing over a decent amount of hops I wouldn't hash
> both layer-3/layer-4 and label-1/label-2 on every router because then
> your per-flow becomes quite segregated and you might find issues where
> your load balancing on many routers will break the seemingly load
> balancing of another router since the hashing algorithm will produce the
> same result on each router.
>
> -Ben
>
> -----Original Message-----
> From: juniper-nsp-bounces at puck.nether.net
> [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Harry Reynolds
> Sent: Monday, July 14, 2008 6:18 PM
> To: Marlon Duksa; juniper-nsp at puck.nether.net
> Subject: Re: [j-nsp] BGP and OSPF ECMP
>
> Do you have a per-packet (really per flow) LB policy applied to the
> forwarding table?
>
> This is needed to install two or more forwarding paths in the pfe. BGP
> multipath is a control plane tie breaker, but by default only one of the
> winners is installed as active in the FT.
>
> HTHs
>
>
> [edit]
> regress at asahi# show policy-options
> policy-statement lb {
>    then {
>        load-balance per-packet;
>    }
> }
>
> [edit]
> regress at asahi# show routing-options forwarding-table traceoptions {
>    file forwarding_table;
>    flag route detail;
> }
> export lb;
>
>
> > -----Original Message-----
> > From: juniper-nsp-bounces at puck.nether.net
> > [mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Marlon Duksa
> > Sent: Monday, July 14, 2008 3:22 PM
> > To: juniper-nsp at puck.nether.net
> > Subject: [j-nsp] BGP and OSPF ECMP
> >
> > Does anyone know how to enable ecmp in Junos (I'm on M320
> > with Junos 9.0)?
> >
> > I have a vrf with BGP configured for multipath. In the
> > forwarding table I see only one path installed even though I
> > have two  equal cost physical links to the  NH.
> > My IGP is OSPF and in the routing table OSPF is showing two
> > paths (only one active >) and in the fwd table only one path
> > is selected. How do I force Junos to select both links.
> >
> > Similar with LDP which is used for the transport (tunnel) in
> > this VPN environment.
> >
> > So it looks to me that multipath in BGP is not taking effect
> > because underlying protocols (OSPF and LDP) is not utilizing
> > both links??
> > Thanks,
> > Marlon
> > _______________________________________________
> > juniper-nsp mailing list juniper-nsp at puck.nether.net
> > https://puck.nether.net/mailman/listinfo/juniper-nsp
> >
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>
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