[92457] in North American Network Operators' Group
Re: Lucent GBE (4 x VC4) clues needed
daemon@ATHENA.MIT.EDU (Sam Stickland)
Thu Sep 21 13:51:06 2006
Date: Thu, 21 Sep 2006 18:49:21 +0100
From: Sam Stickland <sam_mailinglists@spacething.org>
To: Saku Ytti <saku+nanog@ytti.fi>
Cc: nanog@merit.edu
In-Reply-To: <20060921131217.GA32715@mx.ytti.net>
Errors-To: owner-nanog@merit.edu
Saku Ytti wrote:
> (oops technical question in nanog, wearing my asbestos suit)
>
> Consider this topology
>
> GSR - 3750 --(GE over 4xVC4) - NSE100 - NSE100 --(GE over 4xVC4) -- 3550 - GSR
>
> All other fibres are dark fibres, except marked.
>
> When we ping either NSE100 <-> GSR leg, when there is no background traffic
> there is no packet loss. If there is even few Mbps, lets say 10Mbps of
> background traffic we get 1-5% packet loss on 1500 bytes, and bit
> less packet loss on small packets. As background traffic increases
> packet loss quickly increases.
[SNIP]
> There isn't very much that can be configured in the Lucent, and we've
> tried pretty much every setting. We've tried to set autonego on
> and off in every gear in the path, without any changes to observed
> behaviour.
Did you try power cycling the Lucents after changing the auto-neg
settings? I've seen some broken autoneg implementations in the past on
managed media converters that didn't change settings immediately. It's
worth a shot as you seem to be all out of other ideas ;)
Sam
