Allied Telesis AT-S24 - Manual (Page 103)

AT-S24 Version 2.01 User’s Guide
103
Port-Based
VLANs
Port-based VLANs are logical groupings of ports. The devices connected
to the member ports of a port-based VLAN share a common broadcast
domain where the traffic within the VLAN is forwarded only to the
member ports.
Each port-based VLAN is assigned a unique VLAN ID (VID) when created.
When a frame enters a switch port, the VID for that port’s VLAN is
associated with the frame. The switch forwards the frame only to the
port or ports that have the same VID and, consequently, that are a part of
the same VLAN.
Each port also has associated with it a port VLAN ID (PVID). When you
create a new VLAN and assign the VLAN a VID, each member port’s PVID
is set equal to the VID of the given VLAN group through the Port to VLAN
Configuration menu.
Since port-based VLANs belong to separate broadcast domains, a router
is required to transfer the frames among the various VLANs.
Port-based VLAN Example. Figure 51 is an example of two port-based
VLANs in an AT-8224XL Switch. The example illustrates the two VLANs
Sales and Production.
Figure 51 VLAN Example
STATUS
RESET
FAULT
RPS PWR
10BASE-T / 100BASE-TX
FAST ETHERNET SWITCH
1
2
3
4
5
6
7
8
9
10
11
12
13
14
15
16
17
18
19
20
21
22
23
24
10BASE-T / 100BASE-TX 1X 3X 5X 7X
2X 4X 6X 8X
9X 11X 13X 15X
10X 12X 14X 16X
17X 19X 21X 23X
18X 20X 22X 24X
A
B
RS-232 TERMINAL PORT 100M LINK / ACTIVITY 10M LINK / ACTIVITY HALF DUP/ COL FULL DUP
PORT ACTIVITY L /A
L /A
D/C
D/C L /A D/C
Router
VLAN 1
AT-8224XL Ethernet Switch
Sales VLAN Production VLAN
(PVID 2) (PVID 3)