inS_cnge2fe16MS_reV–
01/11/12 Page 73
INSTALLATION AND OPERATION MANUAL
CNGE2FE16MS
TECh SUPPORT: 1.888.678.9427
»
Link Type
: Three options are available. Select the
Link Type
pull-down menu to select the link type.
»
Access Link
: A segment that provides the link path for one or more stations to the VLAN-aware
device like switches. An Access Port (untagged port) connecting to the access link has an
untagged VID (also called PVID). After an untagged frame gets into the access port, the switch
inserts a four-byte tag in the frame. The contents of the last 12-bit of the tag is the untagged
VID. When this frame is sent out through any of the access ports of the same PVID, the switch
will remove the tag from the frame to recover it to what it was. Those ports of the same
untagged VID are regarded as the same VLAN group members.
Note: Because the access port doesn’t have an understanding of tagged frame, the field
of Tagged VID is not available.
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Trunk Link
: A segment that provides the link path for one or more VLAN-aware devices. A
Trunk Port connecting to the trunk link has an understanding of tagged frame, which is used
for communications across VLANs. Which frames of the specified VIDs will be forwarded
depends on the values filled in the Tagged VID field. Insert a comma between two VIDs.
Note: A trunk port doesn’t insert tags into an untagged frame, and therefore the untagged
VID field is not available.
It’s not necessary to type
1
in the tagged VID field. The trunk port will forward the
frames of VLAN 1.
The trunk port has to be connected to a trunk/hybrid port of the other switch. Both
the tagged VID of the two ports have to be the same.
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Hybrid Link
: A segment that consists of Access and Trunk links. The hybrid port has
both the features of the access and trunk ports. A hybrid port has a PVID belonging to a
particular VLAN, and also forwards the specified tagged-frames for the purpose of VLAN
communications between switches.
Note: It’s not necessary to type
1
in the tagged VID field. The hybrid port will forward the
frames of VLAN 1.
The trunk port has to be connected to a trunk/hybrid port of the other switch. Both
the tagged VID of the two ports have to be the same.
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QinQ
: With the given port set its link type on QinQ, where frames received will be added a
tag as an outer 802.1Q VLAN header that needs to be specified by users in the Untagged Vid
field next to this pull-down menu. The value(s) specified in the Tagged Vid field show the inner
802.1Q VLAN header(s) that constitute frames with those VLAN headers will be encapsulated.
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Untagged Vid
: This field is available when the Link Type pull-down menu is set on Access Link,
Hybrid Link and QinQ. Assign a number in the range between 1 and 4094.
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Tagged Vid
: This field is available when the Link Type pull-down menu is set on Trunk Link and
Hybrid Link and QinQ. Assign a number in the range between 1 and 4094.
»
Select the
Apply
button on the tab to have the port configuration take effect.
»
And then you can see the link type, untagged VID, and tagged VID information of each port
shown in the table on the screen.
