[alcatel-nsp] unbalanced traffic on GigEs in a LAG

[Alexander Saveliev]

Hello!

We had same problem two years ago. SR-routers assign labels for L3 VPNs on 
per-vpn basis. And balances traffic on P-router--P-router links only with 
MPLS header. This is true for iom1 and iom-20g-b and for Release 6.1 and 
earlier. We tried to L4-headers method, but we didn't see that it worked.

The way to solve the problem with SR-router is to buy new iom2 cards and use 
entropy labels, or to buy new iom3/imm cards and use 'lsr-load-balancing 
lbl-ip' method. Today we have a LAG on imm's and it balances fine.

But for the whole network upgrade we thought that it would be economicaly 
better not to buy many new SR line cards, but to build a DWDM network. So we 
do not have now P-router--P-router links with traffic from several 7750 
PE-routers. We have only PE-PE links.


----- Original Message ----- 
From: "Scott Weeks" <surfer at mauigateway.com>
To: <alcatel-nsp at puck.nether.net>
Sent: Monday, March 08, 2010 11:26 PM
Subject: Re: [alcatel-nsp] unbalanced traffic on GigEs in a LAG


>
>
> -----Original Message-----
>
> I am seeing several cases of Gigabit Ethernet circuits in a LAG with a
> large difference in traffic levels.  For example, in one LAG I have one
> GigE at 45Mbps and the other at 550Mbps.  Has anyone else seen this and
> have an understanding of why?  It's only on a few LAGs in a network of
> many LAGs.
>
>
> --- Wim.Henderickx at alcatel-lucent.com wrote:
>
> Can you tell which services are running on the LAG ?
> ------------------------------------------------
>
>
>
> These're between 7750-to-7750 core MPLS routers.  We use many services, 
> such as VPRNs, VPLSs and epipes, but they all don't extend to all access 
> 7450s.  So it'd be realy hard to tell.
>
> Do some service types cause a different hashing such that I'd see a very 
> large difference in traffic?  In a network with many 10s of LAGs only 2 
> are exhibiting this behavior.  Both LAGs are made up of 2 GigEs.  One is 
> balancing at 42Mbps/550Mbps and the other is 65Mbps/230Mbps.
>
> scott
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