Modifying And Removing Vlans - 3Com corebuilder 3500 Implementation Manual

206 C 9: V
HAPTER IRTUAL
Modifying and
Removing VLANs
LAN
S
You can modify or remove any VLANs on your system. Review the
following guidelines before you modify or remove VLANs:
When you modify VLAN information for a VLAN interface other than
the Default VLAN on your system, you have the option to change
VLAN characteristics such as the VID, member bridge ports, protocol
type, and form of explicit tagging. You can modify the bridge ports
and port tagging type that is associated with the Default VLAN, but
you cannot change its protocol type, name, or VID.
When you modify or remove a VLAN interface, you must specify a
VLAN interface index to identify the VLAN interface. The Default VLAN
always uses the VLAN interface index of 1.
You cannot delete a VLAN for which you have defined a routing
interface.
If you add ports to a specific VLAN, you are permitting additional
traffic through that port. If you remove ports from a specific VLAN and
the default VLAN is intact, those ports come under jurisdiction of the
Default VLAN (unspecified protocol type, and no explicit or implicit
tagging).
Verify that each bridge port is associated with at least one VLAN in
order to handle traffic.
If you modify the default VLAN to remove certain ports, verify that
those ports are included in another VLAN. If the VLAN is in allClosed
mode, those ports are not able to pass data if they are not part of
another VLAN. See "Modifying the Default VLAN" earlier in this
chapter for more information about the Default VLAN.
If you remove the Default VLAN (and you have no other VLANs
defined for the system), your ports may not be able to forward data
until you create a VLAN for them (for example, if you are using
allClosed mode).
If you remove the Default VLAN, the system can no longer recognize
any ports on a newly installed module, even if you delete the Default
VLAN and then redefine it on the system.
If you delete the default VLAN, you must use the reserved VID of 1 if
you redefine it.