ECMP/multipath support

[Andrew Lemin]

Hi Martin,

Yes you are quite right, we are aware that for it to work we need links of roughly equal latency and bandwidth etc, which they are. I.e. both slow and not much.. ;)

Cheers, Andy.

-----Original Message-----
From: Martin Mares [mailto:mj at ucw.cz]
Sent: 01 October 2010 16:15
To: Andrew Lemin
Cc: Ondrej Zajicek; Vincent Bernat; bird-users at trubka.network.cz
Subject: Re: ECMP/multipath support

Hello!

> For us ECMP is important as we load balance connections to remote customer
> sites across different ISPs for redundancy and performance.

When doing that, please keep in mind that whenever the characteristics
(delay and throughput) of the lines are different, TCP congestion control
algorithms tend to fail miserably. This greatly limits the usefulness
of any multipath routing.

                                Have a nice fortnight
--
Martin `MJ' Mares                          <mj at ucw.cz>   http://mj.ucw.cz/
Faculty of Math and Physics, Charles University, Prague, Czech Rep., Earth
Even nostalgia isn't what it used to be.




Monitor Computer Systems Limited
Company Registration Number: NI 17805
Registered Office: 3 Pine Crest, Holywood, North Down, Northern Ireland BT18 9ED