[j-nsp] BGP and OSPF ECMP

[Harry Reynolds]

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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