[j-nsp] BGP Multipath

[Tim Vollebregt]

Hi Keith,

Yes, this sounds good. But to have the inbound/outbound traffic on the new 10GE link you will have to influence the path selection on both import and export policies.

A good way to do this is:

import policy:

set policy-options policy-statement upstream-in term 1GE from neighbor 1.1.1.1
set policy-options policy-statement upstream-in term 1GE then metric 1000
set policy-options policy-statement upstream-in term 1GE then accept
set policy-options policy-statement upstream-in term 10GE from neighbor 2.2.2.2
set policy-options policy-statement upstream-in term 10GE then metric 1
set policy-options policy-statement upstream-in term 10GE then accept

Of course this is just an example, you can use either accept or next policy and all other flavors of routing decision/filtering.

export policy:

set policy-options policy-statement upstream-out term 1GE to neighbor 1.1.1.1
set policy-options policy-statement upstream-out term 1GE then metric 1000
set policy-options policy-statement upstream-out term 1GE then accept
set policy-options policy-statement upstream-out term 10GE to neighbor 2.2.2.2
set policy-options policy-statement upstream-out term 10GE then metric 1
set policy-options policy-statement upstream-out term 10GE  then accept

Hopefully the upstream will honor the metrics you are setting on the outbound policy. Afterwards you can verify if all traffic moves from the 1GE to the 10GE port and when all is gone you can safely remove the 1GE neighbor statement(s).

Good luck.

Tim


On Jul 19, 2013, at 1:10 AM, Keith wrote:

> We recently just turned up another connection to one of our upstreams, so now we have two. One is a GE the other is a 10GE.
> 
> We are getting into new territory here.
> 
> The GE connection is in use and working fine.
> 
> These two connections home to two different routers on our upstream.
> 
> As the BGP policy will remain the same, I was just going to add a new neighbour statement to that
> particular BGP group for that upstream.
> 
> I was told to also add multipath to that as well if I want to use both connections for load balancing.
> 
> Don't really want to use both as the GE will be going away sometime, but to make sure it works I was
> going to add the new neighbor IP address, make sure BGP comes up and traffic is there then remove the old neighbor
> IP address.
> 
> Would this be a sensible way to do it?
> 
> Thanks.
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