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Nevermind, I'm an idiot. It's the Spanning-Tree Protocol.

Scott Bartram wrote:
> 
> I recently added a Cisco switch to my network and I'm seeing these
> packets every two seconds. The source ethernet address is the switch.
> CDP is not enabled on the switch. Can someone please identify these?
> 
> I recently started seeing similar packets (same destination, different
> source and length) on my cable modem network on the other side of my
> NetBSD pc router.
> 
> 17:30:23.246143 0:90:f2:b1:7e:28 > 1:80:c2:0:0:0 sap 42 ui/C len=55
>                          0000 0000 0080 0000 90f2 b17e 1e00 0000
>                          0080 0000 90f2 b17e 1e80 0700 0014 0002
>                          000f 0000 0000 0000 0000 0000 0000 0000
>                          0000 0000 0000 00
> 17:30:25.258377 0:90:f2:b1:7e:28 > 1:80:c2:0:0:0 sap 42 ui/C len=55
>                          0000 0000 0080 0000 90f2 b17e 1e00 0000
>                          0080 0000 90f2 b17e 1e80 0700 0014 0002
>                          000f 0000 0000 0000 0000 0000 0000 0000
>                          0000 0000 0000 00
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