Creating Or Modifying An Ethernet Vlan - Cisco 3845 - Security Bundle Router Software Manual

Chapter 10 Configuring VLANs

Creating or Modifying an Ethernet VLAN

To access VLAN configuration mode, enter the vlan global configuration command with a VLAN ID.
Enter a new VLAN ID to create a VLAN, or enter an existing VLAN ID to modify that VLAN. You can
use the default VLAN configuration
Note Extended-range VLANs use the default Ethernet VLAN characteristics and the MTU is the only
parameter you can change.
For more information about commands available in this mode, see the vlan command description in the
command reference for this release. When you have finished the configuration, you must exit VLAN
configuration mode for the configuration to take effect. To display the VLAN configuration, enter the
show vlan privileged EXEC command.
The configurations of VLAN IDs 1 to 1005 are always saved in the VLAN database (vlan.dat file) with
a VLAN number and name and in the switch running configuration file. Extended-range VLANs are not
saved in the VLAN database; they are saved in the switch running configuration file. You can save the
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 or modify an Ethernet VLAN:
Command
Step 1 configure terminal
Step 2
vlan vlan-id
Step 3
name vlan-name
Step 4
mtu mtu-size
Step 5 end
Step 6 show vlan {name vlan-name | id vlan-id} Verify your entries. The name option is only valid for VLAN IDs 1 to
Step 7
copy running-config startup config
To delete a VLAN, use the no vlan vlan-id global configuration command. You cannot delete VLAN 1
or VLANs 1002 to 1005.
When you delete a VLAN, any ports assigned to that VLAN become inactive. They remain associated
Caution
with the VLAN (and thus inactive) until you assign them to a new VLAN.
OL-23400-01
(Table 10-2) or enter commands to configure the VLAN.
Purpose
Enter global configuration mode.
Enter a VLAN ID, and enter VLAN configuration mode. Enter a new
VLAN ID to create a VLAN, or enter an existing VLAN ID to modify
that VLAN. The available VLAN ID range for this command is 1 to
4094.
Note When you create a new VLAN, by default the VLAN is a
UNI-ENI isolated VLAN.
(Optional and supported on normal-range VLANs only) Enter a name
for the VLAN. If no name is entered for the VLAN, the default in the
VLAN database is to append the vlan-id with leading zeros to the word
VLAN. For example, VLAN0004 is a default VLAN name for VLAN 4.
(Optional) Change the MTU size.
Return to privileged EXEC mode.
1005.
(Optional) Save the configuration in the switch startup configuration
file.
Cisco ME 3800X and 3600X Switch Software Configuration Guide
Creating and Modifying VLANs
10-7