[j-nsp] load balancing between juniper routers for unequalcostpath

[Paul Goyette]

> As both Chuck and Leigh have stated, you CAN use GRE tunnels 
> to do this, however, you will run into MTU size issues by 
> doing this. You will also need tunneling/Adaptive 
> Services/MultiServices PICs (or ASM cards if it's an M7i were 
> dealing with) to do gre tunneling.
> 
> The far "cleaner" way here is to follow Andy's suggestions 
> and build 2 x RSVP signalled LSPs with strict routing options 
> (EROs) so that they take different paths across your network, 
> but appear to be the same metric to OSPF, hence, they will 
> load balance.

If the metrics reflect true costs and latency, then this could
easily result in packet sequencing problems.  The specific set
of packets which would experience problems will depend on what
how set the load-balancing hash-key fields.

Just pointing this out in case you care...  :)