IronPort Systems 4108GL - Manual (Page 313)

14-7
Port-Based Virtual LANs (VLANs) and GVRP
Port-Based Virtual LANs (Static VLANs)
P
o
rt
-Ba
sed V
ir
tual
LANs
(VLANs)
a
n
d
G
V
RP
Figure 14-4. Example of Tagged and Untagged VLAN Technology in the Same
Network
For more information on VLANs, refer to:
■ “Overview of Using VLANs” (page 14-7)
■ “Menu: Configuring VLAN Parameters (page 14-11)
■ “CLI: Configuring VLAN Parameters” ( page 14-11)
■ “Web: Viewing and Configuring VLAN Parameters” (page 14-22)
■ “VLAN Tagging Information” (page 14-23)
■ “Effect of VLANs on Other Switch Features” (page 14-27)
■ “VLAN Restrictions” (page 14-29)
Overview of Using VLANs
VLAN Support and the Default VLAN
In the factory default configuration, VLAN support is enabled and all ports on
the switch belong to the default VLAN (named DEFAULT_VLAN). This places
all ports in the switch into one physical broadcast domain. In the factory-
default state, the default VLAN is the primary VLAN.
You can partition the switch into multiple virtual broadcast domains by adding
one or more additional VLANs and moving ports from the default VLAN to the
new VLANs. (The switch supports up to 30 VLANs.) You can change the name
of the default VLAN, but you cannot change the default VLAN’s VID (which is
always “1”). Although you can remove all ports from the default VLAN, this
VLAN is always present; that is, you cannot delete it from the switch.
Which VLAN Is Primary?
Because certain features and management functions, such as single IP-
address stacking, run on only one VLAN in the switch, and because DHCP and
Bootp can run per-VLAN, there is a need for a “dedicated management VLAN”
Non-802.1Q-
compliant switch
Switch
Switch
2524
Switch
2524 Switch
4108 Switch
4108
Untagged VLAN Links
Tagged VLAN Link