Configuring Extended-Range VLANs
When the switch is in VTP transparent mode (VTP disabled) and the enhanced software image is installed), you can create extended-range VLANs (in the range 1006 to 4094). Extended-range VLANs enable service providers to extend their infrastructure to a greater number of customers. The extended-range VLAN IDs are allowed for any switchport commands that allow VLAN IDs. You always use config-vlan mode (accessed by entering the vlan vlan-idglobal configuration command) to configure extended-range VLANs. The extended range is not supported in VLAN configuration mode (accessed by entering the vlan database privileged EXEC command).
Extended-range VLAN configurations are not stored in the VLAN database, but because VTP mode is transparent, they are stored in the switch running configuration file, and you can save the configuration in the startup configuration file by using the copy running-config startup-config privileged EXEC command.
This section includes this information about extended-range VLANs:
•
Default VLAN Configuration
Default VLAN Configuration
•Configuration Guidelines for Extended-Range VLANs
Configuration Guidelines for Extended-Range VLANs
•Creating an Extended-Range VLAN
Creating an Extended-Range VLAN
•Displaying VLANs
Displaying VLANsDefault VLAN Configuration
See Table 13-3 for the default configuration for Ethernet VLANs. You can change only the MTU size on extended-range VLANs; all other characteristics must remain at the default state.
Configuration Guidelines for Extended-Range VLANs
Follow these guidelines when creating extended-range VLANs:
•To add an extended-range VLAN, you must use the vlan vlan-id global configuration command and access config-vlan mode. You cannot add extended-range VLANs in VLAN configuration mode (accessed by entering the vlan database privileged EXEC command).
To add an extended-range VLAN, you must use the vlan vlan-id global configuration command and access config-vlan mode. You cannot add extended-range VLANs in VLAN configuration mode (accessed by entering the vlan database privileged EXEC command).
•VLAN IDs in the extended range are not saved in the VLAN database and are not recognized by VTP.
VLAN IDs in the extended range are not saved in the VLAN database and are not recognized by VTP.
•You cannot include extended-range VLANs in the pruning eligible range.
You cannot include extended-range VLANs in the pruning eligible range.
•The switch must be in VTP transparent mode when you create extended-range VLANs. If VTP mode is server or client, an error message is generated, and the extended-range VLAN is rejected.
The switch must be in VTP transparent mode when you create extended-range VLANs. If VTP mode is server or client, an error message is generated, and the extended-range VLAN is rejected.
•You can set the VTP mode to transparent in global configuration mode or in VLAN configuration mode. See the "Disabling VTP (VTP Transparent Mode)" section. You should save this configuration to the startup configuration so that the switch will boot up in VTP transparent mode. Otherwise, you will lose extended-range VLAN configuration if the switch resets.
You can set the VTP mode to transparent in global configuration mode or in VLAN configuration mode. See the "Disabling VTP (VTP Transparent Mode)" section. You should save this configuration to the startup configuration so that the switch will boot up in VTP transparent mode. Otherwise, you will lose extended-range VLAN configuration if the switch resets.
•VLANs in the extended range are not supported by VQP. They cannot be configured by VMPS.
VLANs in the extended range are not supported by VQP. They cannot be configured by VMPS.
•STP is enabled by default on extended-range VLANs, but you can disable it by using the no spanning-tree vlan vlan-id global configuration command. When the maximum number of spanning-tree instances (64) are on the switch, spanning tree is disabled on any newly created VLANs. If the number of VLANs on the switch exceeds 64, we recommend that you configure the IEEE 802.1S Multiple STP (MSTP) on your switch to map multiple VLANs to a single STP instance.
STP is enabled by default on extended-range VLANs, but you can disable it by using the no spanning-tree vlan vlan-id global configuration command. When the maximum number of spanning-tree instances (64) are on the switch, spanning tree is disabled on any newly created VLANs. If the number of VLANs on the switch exceeds 64, we recommend that you configure the IEEE 802.1S Multiple STP (MSTP) on your switch to map multiple VLANs to a single STP instance. 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 config-vlan mode. The extended-range VLAN has the default Ethernet VLAN characteristics (see Table 13-3) and the MTU size is the only parameter you can change. Refer to the description of the vlan global configuration command in the Catalyst 2950 Desktop Switch Command Reference for defaults 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 config-vlan 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:
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.
This example shows how to create a new extended-range VLAN (when the enhanced software image is installed) with all default characteristics, enter config-vlan mode, and save the new VLAN in the switch startup configuration file:
Switch(config)# vtp mode transparent
Switch(config)# vlan 2000
Switch(config-vlan)# end
Switch# copy running-config startup config
Displaying VLANs
Use the show vlan privileged EXEC command to display a list of all VLANs on the switch, including extended-range VLANs. The display includes VLAN status, ports, and configuration information. To view normal-range VLANs in the VLAN database (1 to 1005), use the show VLAN configuration command (accessed by entering the vlan database privileged EXEC command). For a list of the VLAN IDs on the switch, use the show running-config vlanprivileged EXEC command, optionally entering a VLAN ID range.
Table 13-4 lists the commands for monitoring VLANs.
For more details about the show command options and explanations of output fields, refer to the Catalyst 2950 Desktop Switch Command Reference for this release.
This is an example of output from the show vlan privileged EXEC command, showing all VLANs:
Switch# show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Gi0/1, Gi0/2
2 VLAN0002 active Fa0/12
22 VLAN0022 active Fa0/7
102 VLAN0102 active
200 VLAN0200 active
222 VLAN0222 active
400 VLAN0400 active
1000 VLAN1000 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
2005 VLAN2005 active
2006 VLAN2006 active
2007 VLAN2007 active
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 1002 1003
2 enet 100002 1500 - - - - - 0 0
22 enet 100022 1500 - - - - - 0 0
102 enet 100102 1500 - - - - - 0 0
200 enet 100200 1500 - - - - - 0 0
222 enet 100222 1500 - - - - - 0 0
400 enet 100400 1500 - - - - - 0 0
1000 enet 101000 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 1 1003
1003 tr 101003 1500 1005 - - - srb 1 1002
1004 fdnet 101004 1500 - - 1 ibm - 0 0
1005 trnet 101005 1500 - - 1 ibm - 0 0
2005 enet 102005 1500 - - - - - 0 0
2006 enet 102006 1500 - - - - - 0 0
2007 enet 102007 1500 - - - - - 0 0
This is an example of output from the show vlan brief privileged EXEC command:
Switch# show vlan brief
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Fa0/3, Fa0/4
Fa0/5, Fa0/6, Fa0/7, Fa0/8
Fa0/9, Fa0/10, Fa0/11, Fa0/12
Gi0/1, Gi0/2
2 VLAN0002 active Fa0/12
22 VLAN0022 active Fa0/7
102 VLAN0102 active
200 VLAN0200 active
222 VLAN0222 active
400 VLAN0400 active
1000 VLAN1000 active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
2005 VLAN2005 active
2006 VLAN2006 active
2007 VLAN2007 active
This is an example of output from the show running-config vlan command for a range of VLANs:
Switch# show running-config vlan 1005-2005
Building configuration...
Current configuration:
!
vlan 1007
!
vlan 1020
!
vlan 1025
!
vlan 2000
!
vlan 2001
end
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