[c-nsp] Per packet Load balancing

[Joe Shen]

FOA, Load balancing is done on flow level. So, if one of your customer's
host has a big flow persist, load could not be balanced.

 Second, maybe you could not use static route to achive multipath
routing.
I've tested ECMP of OSPF on Alcatel7750, the load on two links differs
little.

Joe

-----Original Message-----
From: cisco-nsp-bounces at puck.nether.net
[mailto:cisco-nsp-bounces at puck.nether.net] On Behalf Of Amol Sapkal
Sent: Tuesday, September 07, 2004 2:08 AM
To: cisco-nsp
Subject: [c-nsp] Per packet Load balancing


Hi,

I got a client who connects to me on L3 on 2 seperate routers. I have
assigned him a pool of /28 (16 IPs).

The total traffic requirement of the client is 2 Megs. One of the IPs,
in the above pool hogs 90% of the total available badnwidth.

Now, the connectivity of the client router (CE) with my router R1 and R2
is via Nortel FR switches. Initially, the client used to connect to R1
only. But, due to banwidth design limitations on the FR switch, I had to
connect it on IP with the other router R2. What I did was, 1.Created a
PVC 'Y' from the CE which ran upto R2. Made this 1 Megs fat. Cut down
the original PVC 'X' between CE and R1 to 1Megs. 2. Put 2 default routes
on the CE to point to these 2 PVCs. This made sure that my outgoing
traffic (from the client router) is load balanced. 3.R1, on which the CE
initially pumped in 2 Megs, is the one which announces the /24 pool
containing the client IPs to the Internet. 4. On R1, I put 2 static
routes to the /28 client pool. One points to the original PVC 'X' and
the other pointed to R2 (there is a PVC running between R1,R2 )

So basically, what I am trying to achieve is 'incoming traffic load
balancing' wrt CE. This was needed because, the traffic for the /28 pool
entered my network on R1 and I do not want the entire 2 Megs to pass to
CE directly. So I put 2 static routes on R1 so that half the traffic is
diverted via R2 to CE (with an latency overhead)

But for some reason, the load balancing is not happening.
'ip cef' was enabled on R1 before, which I thought, was causing the
problems (If I am not wrong, flows are mapped as a  combination of Src
IP/Destn IP to outgoing interface) After disabling ip cef, I still see
that the incoming traffic on CE is not being load balanced.

Any suggestions?



-- 
Warm Regds,

Amol Sapkal

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