3com link 1000 Manual De Usuario
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5-4
C
HAPTER
5: A
DVANCED
M
ANAGEMENT
AutoSelect VLAN Mode works as follows:
1
When an endstation is connected to a Switch or
moves from one port to another, the Switch learns
the MAC address of the endstation.
moves from one port to another, the Switch learns
the MAC address of the endstation.
Figure 5-2 Switch learns the endstation’s MAC address
2
If the relevant port uses AutoSelect VLAN Mode, the
Switch interrogates the VLAN Server to determine
the VLAN membership of the endstation.
Switch interrogates the VLAN Server to determine
the VLAN membership of the endstation.
Figure 5-3 Switch interrogates the VLAN Server
3
Having obtained the VLAN membership for the end-
station, the Switch places the relevant port in the
specified VLAN.
station, the Switch places the relevant port in the
specified VLAN.
Figure 5-4 Switch places the port in the VLAN
AutoSelect VLAN Mode has an advantage over Port
VLAN Mode because once the VLAN Server data-
base is set up correctly, you can move endstations to
other ports or other Switch units and the VLAN allo-
cation of each endstation is automatically config-
ured.
VLAN Mode because once the VLAN Server data-
base is set up correctly, you can move endstations to
other ports or other Switch units and the VLAN allo-
cation of each endstation is automatically config-
ured.
If you use AutoSelect VLAN Mode, note the follow-
ing:
ing:
■
You need to specify an IP address and community
string for the VLAN Server.
string for the VLAN Server.
■
You cannot use VLAN 15.
■
If a port has been configured as a backbone
port or as a VLT port, the port cannot use
AutoSelect VLAN Mode.
port or as a VLT port, the port cannot use
AutoSelect VLAN Mode.
■
If a port has a permanent address stored against
it in the Switch Database, the port cannot use
AutoSelect VLAN Mode.
it in the Switch Database, the port cannot use
AutoSelect VLAN Mode.
■
We recommend that you connect each switch
port to a single endstation. If you want to con-
nect a port to multiple endstations, specify that
the port uses Port VLAN Mode.
port to a single endstation. If you want to con-
nect a port to multiple endstations, specify that
the port uses Port VLAN Mode.