[c-nsp] Cisco1900 routing packets with destination MAC all zero?

rako rakovsk at gmail.com
Mon May 8 06:17:35 EDT 2017

Thx for the hint, indeed "sh controllers gigabitEthernet 0/0" prints it.

No mention of MAC 0000.0000.0000 in the output, but packets with all-zero
DMAC are apparently counted both under ffff.ffff.ffff hits as well as under
Software filtered frames.

In reality they pass through to L3 processing.

2017-05-08 11:35 GMT+02:00 Saku Ytti <saku at ytti.fi>:

> On 8 May 2017 at 12:25, rako <rakovsk at gmail.com> wrote:
> > The question is really why destination MAC 0000.0000.0000 passes behind
> > PHY/mac_filter on this platform and whether such behavior should be
> > generally considered wrong.
> You can view the contents of the MAC filter, I don't have any classic
> IOS CPEs, so I can't tell you exact command, but it's under 'show
> controller ...' somewhere. It's not going to be conclusive I'm afraid,
> but might help.
> --
>   ++ytti

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