Step 1 Before you can create a VLAN, the switch must be in VTP server mode or VTP transparent mode. If the switch is a VTP server, you must define a VTP domain name before you can add any VLANs. This has to be defined regardless of the number of switches in the network (one or many), or whether or not you will be using VTP to propagate VLANs to other switches in the network. For details on VTP, please refer to the Understanding and Configuring VLAN Trunk Protocol (VTP) document.
The default VTP configuration on the switch is as follows:
CatosSwitch (enable) show vtp domain
Domain Name Domain Index VTP Version Local Mode PassWord
-------------------------------- ------------ ----------- ----------- ----------
1 2 server -
Vlan-count Max-vlan-storage Config Revision Notifications
---------- ---------------- --------------- -------------
5 1023 0 disabled
Last Updater V2 Mode Pruning PruneEligible on Vlans
--------------- -------- -------- -------------------------
0.0.0.0 disabled disabled 2-1000
Use the set vtp command to set the domain name and mode.
CatosSwitch (enable) set vtp domain ?
Domain name
CatosSwitch (enable) set vtp domain cisco ?
mode Set VTP mode
passwd Set VTP password
pruning Set VTP pruning
v2 Set VTP version 2
CatosSwitch (enable) set vtp domain cisco mode ?
client VTP client mode
server VTP server mode
transparent VTP transparent mode
CatosSwitch (enable) set vtp domain cisco mode server
VTP domain cisco modified
Step 2 Verify VTP configuration by using the show vtp domain command.
CatosSwitch (enable) show vtp domain
Domain Name Domain Index VTP Version Local Mode Password
-------------------------------- ------------ ----------- ----------- ----------
cisco 1 2 server -
Vlan-count Max-vlan-storage Config Revision Notifications
---------- ---------------- --------------- -------------
5 1023 1 disabled
Last Updater V2 Mode Pruning PruneEligible on Vlans
--------------- -------- -------- -------------------------
0.0.0.0 disabled disabled 2-1000
If you have the output of a show vtp domain command from your Cisco device, you can use Output Interpreter to display potential issues and fixes. To use Output Interpreter , you must be a registered user, be logged in, and have javascript enabled.
Step 3 Once the VTP domain has been set and verified, you can begin to create VLANs on the switch. By default, there is only a single VLAN for all ports, and this VLAN is called the default. VLAN1 cannot be renamed or deleted.
You can use the show vlan command to display the parameters for all configured VLANs in the administrative domain, as shown below:
CatosSwitch (enable) show vlan
VLAN Name Status IfIndex Mod/Ports, Vlans
---- -------------------------------- --------- ------- ------------------------
1 default active 5 1/1-2
3/1-48
4/1-16
1002 fddi-default active 6
1003 token-ring-default active 9
1004 fddinet-default active 7
1005 trnet-default active 8
VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ ------ ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 trcrf 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - - - 0 0
1005 trbrf 101005 1500 - - - ibm - 0 0
VLAN DynCreated RSPAN
---- ---------- --------
1 static disabled
1002 static disabled
1003 static disabled
1004 static disabled
1005 static disabled
VLAN AREHops STEHops Backup CRF 1q VLAN
---- ------- ------- ---------- -------
1003 7 7 off
To create VLANs, use the set vlan command, as show below:
CatosSwitch (enable) set vlan
Usage: set vlan
(An example of mod/port is 1/1,2/1-12,3/1-2,4/1-12)
set vlan [name ] [type ] [state ]
[pvlan-type ]
[said ] [mtu ] [ring ]
[decring ]
[bridge
] [parent ]
[mode
] [stp ]
[translation ] [backupcrf ]
[aremaxhop ] [stemaxhop ]
[rspan]
(name = 1..32 characters, state = (active, suspend)
type = (ethernet, fddi, fddinet, trcrf, trbrf)
said = 1..4294967294, mtu = 576..18190
pvlan-type = (primary,isolated,community,none)
hex_ring_number = 0x1..0xfff, decimal_ring_number = 1..4095
bridge_number = 0x1..0xf, parent = 2..1005, mode = (srt, srb)
stp = (ieee, IBM, auto), translation = 1..1005
hopcount = 1..13)
Set vlan commands:
----------------------------------------------------------------------------
set vlan Set vlan information
set vlan mapping Map an 802.1q vlan to an Ethernet vlan
CatosSwitch (enable) set vlan 2 name cisco_vlan_2
Vlan 2 configuration sUCcessful
Note: You can verify the VLAN configuration by using the show vlan command, as shown below:
CatosSwitch (enable) show vlan
VLAN Name Status IfIndex Mod/Ports, Vlans
---- -------------------------------- --------- ------- ------------------------
1 default active 5 1/1-2
3/1-48
4/1-16
2 cisco_vlan_2 active 75
1002 fddi-default active 6
1003 token-ring-default active 9
1004 fddinet-default active 7
1005 trnet-default active 8
VLAN Type SAID MTU Parent RingNo BrdgNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ ------ ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
2 enet 100002 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 trcrf 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - - - 0 0
1005 trbrf 101005 1500 - - - IBM - 0 0
(Output Suppressed...)
Step 4 If you want to add ports to the VLAN, use the set vlan ... command.
CatosSwitch (enable) set vlan 2 3/1-12
VLAN 2 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
2 3/1-12
15/1
Note: You can also create the VLAN and add the ports to that VLAN with all the information in a single command.
For example, if you want to create the third VLAN and then assign ports 3/13-3/15 to that VLAN, use the following command:
CatosSwitch (enable) set vlan 3 3/13-15
Vlan 3 configuration successful
VLAN 3 modified.
VLAN 1 modified.
VLAN Mod/Ports
---- -----------------------
3 3/13-15
15/1
Step 5 Verify VLAN configuration by using show vlan command.
CatosSwitch (enable) show vlan
VLAN Name Status IfIndex Mod/Ports, Vlans
---- -------------------------------- --------- ------- ------------------------
1 default active 5 1/1-2
3/16-48
4/1-16
2 cisco_vlan_2 active 75 3/1-12
3 VLAN0003 active 76 3/13-15
1002 fddi-default active 6
1003 token-ring-def
