Stackable NWay Ethernet Switch User’s Guide
Switch Management Concepts
45
Transmit on VLAN #
Member of VLAN #
Port
PVID
VID
Ports
Port 1
1
1
1,2,3,7
Port 2
1
Port 3
1
Port 7
3
3
1,2,3,7,11,1
2
Port 11
2
2
11,12,7
Port 12
2
Table 5-2. Example of possible VLAN assignments
The server attached to Port 7 is shared by VLAN 1 and VLAN 2
because Port 7 is a member of both VLANs (it is listed as a member
of VID 1 and 2). Since it can receive packets from both VLANs, all
ports can successfully send packets to it to be printed. Ports 1, 2 and
3 send these packets on VLAN 1 (their PVID=1), and Ports 11 and 11
send these packets on VLAN 2 (PVID=2). The third VLAN (PVID=3)
is used by the server to transmit files that had been requested on
VLAN 1 or 2 back to the computers. All computers that use the
server will receive transmissions from it since they are all located on
ports which are members of VLAN 3 (VID=3).
VLANs Spanning Multiple Switches
VLANs can span multiple switches as well as your entire network.
Two considerations to keep in mind while building VLANs of this sort
are whether the switches are IEEE 802.1Q-compliant and whether
VLAN packets should be tagged or untagged.
Definitions of relevant terms are as follows:
? ?
Tagging
The act of putting 802.1Q VLAN information into the
header of a packet. Ports with tagging enabled will put the VID
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