Untagged device to 802.1Q compliant device (tagging and GVRP)
In this configuration, an untagged device, Station A, is attempting to communicate
to a tagged device that is a member of the same VLAN. The network administrator
first statically creates VLAN 5 on the switch to include Port 1 in this VLAN. Port 1 is
configured to transmit frames untagged in VLAN 5 because Station A cannot
comprehend tagged frames. Port 1 is configured with a PVID of 5 to ensure that
untagged frames received on that port are assigned to VLAN 5.
Station B is also assigned to VLAN 5, and because it supports both tagging and
GVRP it will automatically register its membership to VLAN 5. Because Station B
resides off of Port 12, Port 12 must be configured to be either autodetected or
always included in VLAN 5. Port 12 may be configured to transmit frames as either
tagged or untagged because Station B is capable of handling both.
Frames from Station A arrive at Port 1 and are tagged with a VLAN ID equal to the
PVID of Port 1 (VLAN 5). The frames are then switched to Port 12, where they are
transmitted out of the switch either tagged or untagged, as configured. On the
return path, frames tagged with VLAN 5 will arrive at Port 12, and will be received
since the port is a member of VLAN 5. The frames will be switched to Port 1, and
will be transmitted as untagged, as specified by the configuration of that port in that
VLAN.
If any devices on a link cannot handle tagged frames, it would be best to configure
the port to transmit frames as untagged in any VLAN in which those devices
participate.
Station A
Untagged
Station B
Tagged, VLAN 5
Static VLAN 5:
Port 1 fixed
Port 1:
PVID = 5
Port 12:
PVID = 1
100
/10 Mbps
LINK
/TxRx
EIA-232
19200 8 N 1
l
OK
Fault
1X
1
2
9X
2X
10X
3X
11X
4X
12X
5X
13X
7X
15X
6X
14X
8X
16X
Figure 78. Untagged device to 802.1Q compliant device (tagging and GVRP) configuration
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