CTC Union FRM220 User Manual download pdf (Page 34)

3.2.6.8VLANPerPortConfiguration

In FRM220-1000MS there are actually three different ports, the external copper and fiber ports, plus the internal CPU port. The VLAN Per

Port Setting page deals with how frames exit (egress) the copper, fiber and CPU (management). These are the Frame Egress Type. The

following operations may be performed to the outgoing frames: <1>: Replace Tag The switch will remove VLAN tags from packets then add

new tags to them. The inserted tag is defined in ”VLAN Group Index”. <2>: Remove Tag The switch will remove VLAN tags from packets, if

they are tagged. The switch will not modify packets received without tags <3>: Add Tag The switch will add VLAN tags to packets, if they are

not tagged when these packets are output on this port. The switch will not add tags to packets already tagged. The inserted tag is defined in

”VLAN Group Index”. <4>: Don't Touch Tag Do not insert or remove VLAN tags to/from packet which is output on this port.

3.2.6.9QinQConfiguration

Q in Q or double VLAN tagging is defined in IEEE802.1ad. Double VLAN tagging is required when a service provider wishes to carry a

customer’s VLAN tagged traffic through its own VLAN network. In MEF (Metro Ethernet Forum) terms, the first tag or “inner tag” is referred to

as the C-tag (customer) while the second tag or “outer tag” is referred to as the S-tag (service provider). Normal VLAN tag has an EtherType

(TPID or Tag Protocol Identifier) of 0x8100. The IEEE802.1ad standard recommends 0x88a8 TPID for the outer or S-tag.

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CTC Union FRM220 User Manual Page 34