Mailing List Archive: BGP load balance per packet

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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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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> http://join.msn.com/?page=features/virus
>
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