lkml.org 
[lkml]   [2000]   [Sep]   [26]   [last100]   RSS Feed
Views: [wrap][no wrap]   [headers]  [forward] 
 
Messages in this thread
/
Date
From
SubjectRe: Bonding Driver Questions
On Sun, 24 Sep 2000, Constantine Gavrilov wrote:

> Hi, I'd like to use channel bonding driver for high availability.
>
> Currenly the bonding driver does not detect a dead slave link. When a
> slave link dies, it causes lots of network retransmits and the effective
> speed of the bonding device drops to almost zero. This has been verified
> in the lab.
>
> How difficult would it be to "teach" the bonding driver to check for the
> link status of its slave interfaces? Does ethernet layer provides a
> uniform way to check for the link status or it is adapter dependent?


Ciscos solution to this involves 'KeepAlive' packets. They
default to on for a FastEtherChannel link, and each sub-interface
sends then every 10 seconds (default, configable), and expects to
receive them as well. If it does not it takes down the sub interface
until keepalives return.


Unfortunately I have not been able to find any documentation on
the Cisco FastEtherChannel KeepAlive protocol, it would be nice to add
this to Linux Bonding. Its kind of a dirty fix, but it would fix link
state issues, and be compat with Cisco EtherChannel, Sun
EtherTrunking, and the Adaptec DuraLan bonding systems.

---
As folks might have suspected, not much survives except roaches,
and they don't carry large enough packets fast enough...
--About the Internet and nuclear war.


-
To unsubscribe from this list: send the line "unsubscribe linux-kernel" in
the body of a message to majordomo@vger.kernel.org
Please read the FAQ at http://www.tux.org/lkml/

\
 
 \ /
  Last update: 2005-03-22 12:39    [W:0.038 / U:2.052 seconds]
©2003-2018 Jasper Spaans|hosted at Digital Ocean and TransIP|Read the blog|Advertise on this site