Specifications

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Cisco MWR 2941 Mobile Wireless Edge Router Release 3.5 Software Configuration Guide, Cisco IOS Release 15.1(3)MR
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Chapter 7 Configuring VLANs
Creating and Modifying VLANs
– If necessary, you can shut down the routed port assigned to the internal VLAN, which frees up
the internal VLAN, and then create the extended-range VLAN and re-enable the port, which
then uses another VLAN as its internal VLAN. See the “Creating an Extended-Range VLAN
with an Internal VLAN ID” section on page 7-9.
• Although the switch supports a total of 1005 (normal-range and extended-range) VLANs, the
number of routed ports, SVIs, and other configured features affects the use of the router 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.
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 (Table 7-2) or enter commands to configure the VLAN.
Note Extended-range VLANs use the default Ethernet VLAN characteristics and the MTU and the UNI-ENI
VLAN configurations are the only parameters that you can change.
For more information about commands available in VLAN configuration 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.
Note Before you create an extended-range VLAN, you can verify that the VLAN ID is not used internally by
entering the show vlan internal usage privileged EXEC command. If the VLAN ID is used internally
and you want to release it, go to the “Creating an Extended-Range VLAN with an Internal VLAN ID”
section on page 7-9 before creating the extended-range VLAN.
Follow these steps to create or modify an Ethernet VLAN:
Command Purpose
Step 1
configure terminal Enter global configuration mode.
Step 2
vlan vlan-id 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 1–4094.
Note When you create a new VLAN, by default the VLAN is a
UNI-ENI isolated VLAN.
Step 3
name vlan-name (Optional and supported only on normal-range VLANs) 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.