[j-nsp] BGP load balance per packet

[Domiciano Alonso Fernández]

Hi
The name "per-packet" is rather misleading. It uses a hash to identify 
flows, so that the load-balance is per-flow in fact (which is a good 
thing, as avoids packet disordering).
Your set up seems to be a lab one -for the private addresses, I mean-, 
is the traffic "real one" or generated by a generator, you may try 
setting several flows (random source & destination addresses)
Regards

tchoel . wrote:

> Hi,
>
> We've configured a JunOS 5.7R2.4 for BGP load-balancing.
> We've four links on our router all connected to same
> upstream autonomous system. Two of the links are connected
> to one upstream router and the other two is connected to an
> other upstream router. BGP sessions are established with
> loopback addresses and we've also configured static routes
> for each loop-back address. Import policy filters are setting
> the next-hop as the proper loopback address.
> [routing-options forwarding-table] is configured with a policy
> for load balance per-packet and bgp is configured with multipath.
> But we still see that traffic is forwarded using only one link
> of the each pair connected to upstream routers. I've checked the
> documentation but couldn't find a solution.Here's the configuration 
> information;
>
> thanks,
> tchoel
>
> [routing-options static]
>
> route 192.168.0.1/32 next-hop [172.16.0.1 172.16.0.5] //links A and B
> route 192.168.1.1/32 next-hop [172.16.1.1 172.16.1.5] //links C and D
>
> [protocols bgp]
>
> group links-AB-toUp1 {
>    type external;
>    multihop {
>        ttl 2;
>    }
>    local-address 10.0.0.1;
>    import import4AB;
>    export exportPolicy;
>    peer-as 65513;
>    multipath;
>    neighbor 192.168.0.1;
> }
> group links-CD-toUp1 {
>    type external;
>    multihop {
>        ttl 2;
>    }
>    local-address 10.0.0.1;
>    import import4CD;
>    export exportPolicy;
>    peer-as 65513;
>    multipath;
>    neighbor 192.168.1.1;
> }
>
> [policy-options policy-statement import4AB]
>
> term first {
>    from {
>        ..
>          things_to_reject;
>        ..
>    }
>    then reject;
> }
>
> term second {
>    from {
>        protocol bgp;
>        route-filter 0.0.0.0/0 upto /24;
>    }
>    then {
>        next-hop 192.168.0.1;
>        accept;
>    }
> }
> term last {
>    then reject;
> }
>
> [policy-options policy-statement import4CD]
>
> term first {
>    from {
>        ..
>          things_to_reject;
>        ..
>    }
>    then reject;
> }
>
> term second {
>    from {
>        protocol bgp;
>        route-filter 0.0.0.0/0 upto /24;
>    }
>    then {
>        next-hop 192.168.1.1;
>        accept;
>    }
> }
> term last {
>    then reject;
> }
>
> [policy-options policy-statement equal_cost]
>
> then {
>    load-balance per-packet;
> }
>
> [routing-options forwarding-table]
> export equal_cost;
>
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