[j-nsp] BGP and OSPF ECMP

[Boyd, Benjamin R]

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
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> juniper-nsp mailing list juniper-nsp at puck.nether.net 
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> 
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