[j-nsp] equal-cost multipath using two DS3s

[Leah Lynch (Contractor)]

How are these redundant paths connected? Are you running BGP with your
upstream providers and between those routers? Do you want it balanced in
and outbound? Have you looked at how your routes appear on route
servers? 

If you setup the BGP peering correctly, you should see some relatively
balanced traffic, assuming both upstreams are relatively equivalent in
their peering relationships with others.

What types of tables are you accepting? All routes, and default,
customer only, or just a default? Each router is only going to take its
best path to the Internet. So, most likely, you will need to do a bit of
work to distribute the load equally. Keep in mind, BGP does not load
balance, it load shares.

Beyond that, you need to make sure the routing up to your Internet
routers is distributed equally, if all the traffic goes to Router1, it
will probably exit that router, if it has the best path to the Internet.

Finally, if you really need specific load balancing, you might want to
look into third party load sharing solutions like Cisco PFR.

This all sort of depends on your requirements, budget, and amount of
effort you want to spend on the solution.

Leah

-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Justin M.
Streiner
Sent: Monday, April 19, 2010 2:29 PM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] equal-cost multipath using two DS3s

I have an M10i connected to an M7i at a remote location using two DS3s.
Attempts thus far to get traffic to share both links relatively evenly 
have not gone well.  All of the traffic will typically use only one of 
the links, so it gets saturated while the second like is barely even 
touched.  JTAC suggested per-packet load-sharing, however I 
would like to avoid that because of the possibility of packets arriving 
out of order which could make latency/jitter-sensitive applications (IP 
video conferencing, etc) unhappy.  JTAC later suggested that per-packet 
load-sharing in JUNOS parlance doesn't necessarily mean per-packet load-
sharing (naturally :)  ).  Multilink bundles do not appear to be an
option 
without link services PICs, and even at that, they don't seem to be
built 
to work with traffic levels greater than a few T1/E1s.

Both routers are running JUNOS 8.5R4.3.

That being the case, if anyone has had to deal with a situation like
this, 
I'd be interested in hearing how you addressed it.

jms
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