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