[c-nsp] TIL: Maintenance Operations Protocol (MOP)

[Nick Hilliard]

Drew Weaver wrote on 04/08/2021 16:43:
> Sorry for the noise if you are all aware of what MOP is but if you
> aren't aware of what it is and use Cisco products (especially in a
> multi-tenant environment) it may be a good idea to read about it and
> evaluate any impact it may or may not have on your environment.
MOP is one of those services that seems to disappear and reappear on 
various cisco software versions and trains, almost at random.  It would 
be interesting to know how much of the old DECnet stack is needed to 
keep this particular fossil alive.

It leaks link-local frames. This is harmful.  We don't like it at IXPs.

"no mop enabled" disables it on a per interface basis - this is possibly 
the only cisco command that uses "enabled" instead of "enable" for this 
context, i.e. this is very ancient.

Nick