[j-nsp] BGP load-balancing

[Arda Balkanay]

Have you configured a load balance policy for your forwarding-table ?

me at lab1_mx960> show configuration policy-options policy-statement
Load-Balance-Policy
then {
    load-balance per-packet;
}

me at lab1_mx960> show configuration routing-options forwarding-table
export Load-Balance-Policy;


to load balance your traffic you need to enable it at forwarding table.
Kind Regards
Arda




> I need your input regarding BGP loadbalancing with multipath option.
>
> In JNCIP-M study guide, one of the requirement given in iBGP case study is
> to "Redistribute a summary of the RIP routes into IBGP from both r6 and r7"
> and in second requiement "r5 must IBGP load-balance to the summary route
> representing the RIP prefixes".
>
> After advetiseing RIP summary route (192.168.0.0/22) from R6 and R7. R5
> router is able to see two viable next-hops after enabling multipath in R5
> ibgp group but in forwarding table of R5 shows only one path via R6 is
> available.
>
> My question is:
>
> Is only enabling multipath option will achive above mention requirement
> regarding BGP loadbalancing ?
>
> As junos perform per-prefix loadbalncing by default so the iBGP case study
> requiremnt that "r5 must IBGP load-balance to the summary route
> representing
> the RIP prefixes" cannot be achiedved by with multipath only. All other
> router behind R5 router also following the same path as chosen by R5.
>
> some output from test senario are below:
>
> aamir at LAB1 <aamir at LAB1># run show route protocol bgp logical-router R5
> 192.168.0.0/22
> inet.0: 80 destinations, 136 routes (80 active, 0 holddown, 0 hidden)
> + = Active Route, - = Last Active, * = Both
> 192.168.0.0/22     *[BGP/170] 01:50:49, localpref 100, from 10.0.9.6
>                      AS path: I
>                    > to 10.0.8.6 via lt-1/2/0.116
>                      to 10.0.8.10 via lt-1/2/0.117
>                    [BGP/170] 01:50:49, localpref 100, from 10.0.9.7
>                      AS path: I
>                    > to 10.0.8.10 via lt-1/2/0.117
> [edit]
> aamir at LAB1#
>
> Forwarding table:
> Logical router: R5
> Routing table: inet
> Internet:
> Destination        Type RtRef Next hop           Type Index NhRef Netif
> 192.168.0.0/22     user     0                          indr  262148     3
>                                         10.0.8.6             ucst  974
> 7 lt-1/2/0.116
>
>
> Any input is more then welcome.
>
> Regards.
> Aamir
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