Cisco 7609 - Page 141

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Cisco 7600 Series Router Cisco IOS Software Configuration Guide—12.1E
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Chapter 9 Configuring VLANs
Configuring VLANs
When you create or modify an Ethernet VLAN, note the following syntax information:
• Releases 12.1(11b)E and later support VLAN configuration in global configuration mode.
• Releases 12.1(13)E and later support extended-range VLANs.
• RPR+ redundancy does not support a configuration entered in VLAN database mode. Use global
configuration mode with RPR+ redundancy.
• Because Layer 3 ports and some software features require internal VLANs allocated from 1006 and
up, configure extended-range VLANs starting with 4094.
• You can configure extended-range VLANs only in global configuration mode. You cannot configure
extended-range VLANs in VLAN database mode.
• Layer 3 ports and some software features use extended-range VLANs. If the VLAN you are trying
to create or modify is being used by a Layer 3 port or a software feature, the router displays a
message and does not modify the VLAN configuration.
When deleting VLANs, note the following syntax information:
• You cannot delete the default VLANs for the different media types: Ethernet VLAN 1 and FDDI or
Token Ring VLANs 1002 to 1005.
• When you delete a VLAN, any LAN ports configured as access ports assigned to that VLAN become
inactive. The ports remain associated with the VLAN (and inactive) until you assign them to a new
VLAN.
This example shows how to create an Ethernet VLAN in global configuration mode and verify the
configuration:
Router# configure terminal
Router(config)# vlan 3
Router(config-vlan)# end
Router# show vlan id 3
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
3 VLAN0003 active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
3 enet 100003 1500 - - - - - 0 0
Primary Secondary Type Interfaces
------- --------- ----------------- ------------------------------------------
This example shows how to create an Ethernet VLAN in VLAN database mode:
Router# vlan database
Router(vlan)# vlan 3
VLAN 3 added:
Name: VLAN0003
Router(vlan)# exit
APPLY completed.
Exiting....
Step 3
Router(config-vlan)# end
or
Router(vlan)# exit
Updates the VLAN database and returns to privileged
EXEC mode.
Step 4
Router# show vlan [id | name] vlan
Verifies the VLAN configuration.
Command Purpose