3Com 4007, Command Reference Manual

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184 C
HAPTER
10: V
IRTUAL
LAN
S
(VLAN
S
)
Layer 2
Switching
Modules
✓
Multilayer
Switching
Modules
bridge vlan define Creates VLANs on Multilayer Switching Modules. When you explicitly
configure a VLAN on the module, you assign information such as a VLAN
ID (VID), a set of bridge ports, and, optionally, a protocol type and
IEEE 802.1Q tagging.
To define VLANs on Layer 2 Switching Modules, see the “bridge vlan
detail” command next in this guide.
Valid Minimum Abbreviation
b v def
Important Considerations
■
If you have previously defined your IP VLANs with Layer 3 address
information (that is, network-based VLANs), you can redefine your IP
VLANs without Layer 3 address information. To define multiple IP
interfaces per IP VLAN, use the
ip interface define
command. (See
Chapter 12.)
■
The VLAN that you create with this command is a static VLAN. To
establish routing between static IP VLANs, define your IP VLANs and
then use the
ip interface define
command to define an IP routing
interface. As of Release 3.0, you can also specify the interface type
vlan
to create one or more IP routing interfaces for a static IP VLAN.
■
If you have a router port IP interface on the module, you cannot
specify the port that belongs to the router port IP interface when you
explicitly define an IP VLAN (or a VLAN that includes the IP protocol). A
router port IP interface is an alternative to static VLANs and allows
routing versus bridging. You create a router port IP interface by
entering the
ip interface define
command with the interface type
port
and a single bridge port. A router port IP interface requires
allClosed mode. See Chapter 12 for more information.
■
You must specify a VID in the range from 2 through 4094. You can no
longer define a VLAN other than the default VLAN with a VID of 1.
VID 1 is reserved for the default VLAN only as of Release 3.0.0. (As of
Release 3.0.0, the default VLAN always uses the name
Default
and
the protocol type
unspecified
.) If you delete the default VLAN, you
can redefine it with VID 1 only.
■
You cannot delete a VLAN that has a routing interface associated with
it.
■
If you plan to use the trunking feature or the MPLA feature, define the
appropriate trunks
before you define your VLANs. See Chapter 8 for
more information.