By default, all ports are subjected to a standard layer-2 filtering policy to limit frames that are considered unwanted at the peering fabric.  Below is a list of frames that are filtered (dropped) by default:  This list is expected to grow.

ethernet-destination-address 01:80:c2:00:00:00
ethernet-destination-address 01:00:0c:cc:cc:cc ; snap-type 0x2000
ethernet-destination-address 01:00:0c:cc:cc:cc ; snap-type 0x2003
ethernet-destination-address 01:00:0c:cc:cc:cd
ethernet-destination-address 01:00:0c:cc:cc:cc ; snap-type 0x2004
ethernet-destination-address 01:00:0c:cc:cc:cc ; snap-type 0x0111
ethernet-destination-address 01:00:0c:cc:cc:cc ; snap-type 0x0104
ethernet-destination-address 00:e0:2b:00:00:00 ; snap-type 0x00bb
ethernet-destination-address 01:80:c2:00:00:0e ; ethernet-type 0x88cc