American Fibertek SM8P-SFP - Manual (Page 75)

67 Rev.A1
18-May-11
Role:
This is an egress rule of the port. Here you can choose Access, Trunk or
Hybrid. Trunk means the outgoing packets must carry VLAN tag header.
Access means the outgoing packets carry no VLAN tag header. If
packets have double VLAN tags, one will be dropped and the other will
still be left. As to Hybrid, it is similar to Trunk, and both of them will tag-
out. When the port is set to Hybrid, its packets will be untagged out if the
VID of the outgoing packets with tag is the same as the one in the field of
Untag VID of this port.
Untag VID:
Valid range is 1~4094. It works only when Role is set to Hybrid.
Double Tag:
Double-tag mode belongs to the tag-based mode, however, it would treat
all frames as the untagged ones, which means that tag with PVID will be
added into all packets. Then, these packets will be forwarded as Tag-
based VLAN. So, the incoming packets with tag will become the double-
tag ones. Scroll to enable the function and default is Disable.