LACP Frames / Level3 Transport

Eygene Ryabinkin rea+nanog at
Wed May 25 06:55:33 UTC 2016

Tue, May 24, 2016 at 12:39:03PM +0000, Nevin Gonsalves wrote:
> I just had to sit and trace all the cables to make sure the tx/rx
> lined up for the right circuits as well as hitting the right patch
> panel ports. Once all that got aligned nicely things started working
> magically.

Yep, ports in an "up" state, but LACP not working is the sign of bad
cabling: had been hit by this overnight once when I was preparing to
leave the facilities next day for conference, but ought to make 10G
for the new servers working.  Took around 1/2 hour to sense what
happened at that time (tx was going to, say, port A and rx -- to port
B, but overall all ports were receiving tx and rx) and 3 hours for
rewiring and swearing: probably I am more skilled in the former than
in the latter ;)

Thought that you had checked this in the first place; my bad.

Thanks for sharing!
Eygene Ryabinkin, National Research Centre "Kurchatov Institute"

Always code as if the guy who ends up maintaining your code will be
a violent psychopath who knows where you live.

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