Lucent GBE (4 x VC4) clues needed

Sam Stickland sam_mailinglists at
Thu Sep 21 17:49:21 UTC 2006

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.


> 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 ;)


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