Table of Contents
Advertisement
Chapter 13
Configuring VLANs
•
Creating an Extended-Range VLAN
You create an extended-range VLAN in global configuration mode by entering the vlan global
configuration command with a VLAN ID from 1006 to 4094. This command accesses the VLAN
configuration mode. The extended-range VLAN has the default Ethernet VLAN characteristics (see
Table
command reference for the default settings of all parameters. If you enter an extended-range VLAN ID
when the switch is not in VTP transparent mode, an error message is generated when you exit from
VLAN configuration mode, and the extended-range VLAN is not created.
Extended-range VLANs are not saved in the VLAN database; they are saved in the switch running
configuration file. You can save the extended-range VLAN configuration in the switch startup
configuration file by using the copy running-config startup-config privileged EXEC command.
Beginning in privileged EXEC mode, follow these steps to create an extended-range VLAN:
Command
Step 1
configure terminal
Step 2
vtp mode transparent
Step 3
vlan vlan-id
Step 4
mtu mtu-size
Step 5
end
Step 6
show vlan id vlan-id
Step 7
copy running-config startup config
To delete an extended-range VLAN, use the no vlan vlan-id global configuration command.
The procedure for assigning static-access ports to an extended-range VLAN is the same as for
normal-range VLANs. See the
OL-23389-01
If the number of VLANs on the switch exceeds the maximum number of spanning-tree instances,
we recommend that you configure the IEEE 802.1s Multiple STP (MSTP) on your switch to map
multiple VLANs to a single spanning-tree instance. For more information about MSTP, see
Chapter 17, "Configuring MSTP."
Although the switch supports a total of 64 (normal-range and extended-range) VLANs, the number
of configured features affects the use of the switch hardware. If you try to create an extended-range
VLAN and there are not enough hardware resources available, an error message is generated, and
the extended-range VLAN is rejected.
13-2) and the MTU size. See the description of the vlan global configuration command in the
Purpose
Enter global configuration mode.
Configure the switch for VTP transparent mode, disabling VTP.
Enter an extended-range VLAN ID and enter VLAN configuration mode.
The range is 1006 to 4094.
(Optional) Modify the VLAN by changing the MTU size.
Note
Return to privileged EXEC mode.
Verify that the VLAN has been created.
Save your entries in the switch startup configuration file. To save
extended-range VLAN configurations, you need to save the VTP
transparent mode configuration and the extended-range VLAN
configuration in the switch startup configuration file. Otherwise, if the
switch resets, it will default to VTP server mode, and the extended-range
VLAN IDs will not be saved.
Although all VLAN commands appear in the CLI help in VLAN
configuration mode, only the mtu mtu-size, and remote-span
commands are supported for extended-range VLANs.
"Assigning Static-Access Ports to a VLAN" section on page
Catalyst 2928 Switch Software Configuration Guide
Configuring Extended-Range VLANs
13-9.
13-11
Advertisement
Table of Contents
Troubleshooting
