[c-nsp] 3750 taking errors on multiple ports

[Michael Loftis]

On Tue, Jul 12, 2022 at 16:50 Randy Bush <randy at psg.com> wrote:

> > some hours back, an antique Cisco WS-C3750G-POE-48 started taking output
> > errors on multiple ports.  they are generally vlan edge, a la
> >
> > interface GigabitEthernet1/0/31
> >  description x.sea eth1
> >  switchport access vlan 10
>
> this was 'fixed' by turning vrrp and vrrp6 off on a junos m series
> running 15 plugged into it.  going further down this rabbit hole.


ISTR vaguely something  about ARP timers in the 3750s...short ARP timeouts
on the 3750 and causing unresolved L3 because the M10i (or maybe M7i) was
throttling them due to too many punts to the RE - that was our exact
deployment at job minus X ten plus years ago... 3750 L3 internal and a
M10i. It showed up as errors in SNMP polls of the 3750 and L3 incomplete on
the 3750 in detailed stats/errors.

There's a bunch of hidden traffic policers for punts to the RE on the M
series.


> randy
> _______________________________________________
> cisco-nsp mailing list  cisco-nsp at puck.nether.net
> https://puck.nether.net/mailman/listinfo/cisco-nsp
> archive at http://puck.nether.net/pipermail/cisco-nsp/
>
-- 

"Genius might be described as a supreme capacity for getting its possessors
into trouble of all kinds."
-- Samuel Butler