Is the L2 flag when adding a SPAN mirror intended to indicate that the source 
port is a member of a bridge domain?

I noticed that SPAN can be configured on a port with the L2 flag set and also 
with it unset. So configurations for L2 and ! L2 can both exist at the same 
time. E.g.:

vpp# set interface span TenGigabitEthernet2/0/1 destination 
TenGigabitEthernet2/0/0 both
vpp# set interface span TenGigabitEthernet2/0/1 l2 destination 
TenGigabitEthernet2/0/0 both
vpp# show interface span
Source               Destination           Device       L2
TenGigabitEthernet2/ TenGigabitEthernet2/ (  both) (  both)

Are there cases where this would be necessary? Or do the graph nodes for only 
one of {L2, device} get used for a source interface at any given time?

Thanks,
-Matt


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