VLAN Cisco IOS
From Teknologisk videncenter
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Show commands
Show vlan
Gives a great view of VLAN's and which ports are assigned to it. Try also show vlan brief
SW2#show vlan
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
1 default active Fa0/1, Fa0/2, Gi0/2
100 Admin active
101 Sales active
102 Students active Fa0/8, Fa0/9, Fa0/10, Fa0/11
Fa0/12, Fa0/13, Fa0/14, Fa0/22
1002 fddi-default act/unsup
1003 token-ring-default act/unsup
1004 fddinet-default act/unsup
1005 trnet-default act/unsup
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
1 enet 100001 1500 - - - - - 0 0
100 enet 100100 1500 - - - - - 0 0
101 enet 100101 1500 - - - - - 0 0
102 enet 100102 1500 - - - - - 0 0
1002 fddi 101002 1500 - - - - - 0 0
1003 tr 101003 1500 - - - - - 0 0
1004 fdnet 101004 1500 - - - ieee - 0 0
1005 trnet 101005 1500 - - - ibm - 0 0
Remote SPAN VLANs
------------------------------------------------------------------------------
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------
Show VLAN Field Descriptions
| Field | Description |
|---|---|
| VLAN | VLAN number |
| Name | Name of the VLAN, if configured |
| Status | Status of the VLAN (Active or suspended) |
| Ports | Ports taht belong to the VLAN |
| Type | Media type of the VLAN |
| SAID | Security Association ID value of the VLAN |
| MTU | Maximum Transfer Unit of the VLAN |
| Parent | Parent VLAN if existing |
| RingNo | Ring Number of the VLAN, if applicable |
| BrdgNo | Brudge number of the VLAN, if applicable |
| STP | Spanning Tree Protocol type used on the VLAN |
| BrdgMode | Bridging mode for this VLAN |
| Trans1 | Translation bridge 1 |
| AREHops | Maximum number of hops for all-routers explorer frames |
| STEHops | Maximum number of hops for spanning tree explorer frames |
Show interfaces
A quick summary of all ports and their status
SW2#show interfaces status Port Name Status Vlan Duplex Speed Type .... Fa0/8 notconnect 102 auto auto 10/100BaseTX Fa0/9 notconnect 102 auto auto 10/100BaseTX Fa0/10 notconnect 102 auto auto 10/100BaseTX ....
show switchport status
SW2#show interfaces fastEthernet 0/10 switchport Name: Fa0/10 Switchport: Enabled Administrative Mode: static access Operational Mode: down Administrative Trunking Encapsulation: dot1q Negotiation of Trunking: Off Access Mode VLAN: 102 (Students) Trunking Native Mode VLAN: 1 (default) Administrative Native VLAN tagging: enabled Voice VLAN: none Administrative private-vlan host-association: none Administrative private-vlan mapping: none Administrative private-vlan trunk native VLAN: none Administrative private-vlan trunk Native VLAN tagging: enabled Administrative private-vlan trunk encapsulation: dot1q Administrative private-vlan trunk normal VLANs: none Administrative private-vlan trunk private VLANs: none Operational private-vlan: none Trunking VLANs Enabled: ALL Pruning VLANs Enabled: 2-1001 Capture Mode Disabled Capture VLANs Allowed: ALL Protected: false Unknown unicast blocked: disabled Unknown multicast blocked: disabled Appliance trust: none
Adding VLAN's
The VLAN configuration is stored in a file named VLAN.DAT
Switch1#dir
Directory of flash:/
2 -rwx 128 Mar 26 2007 13:58:48 layout.text
3 -rwx 2888547 Mar 01 1993 01:16:05 c2950-i6q4l2-mz.121-13.EA1.bin
5 -rwx 616 Apr 27 2009 12:40:25 vlan.dat
6 -rwx 1663 Mar 01 1993 00:05:49 config.backup-1.2
7 drwx 832 Mar 04 1993 23:52:10 html
21 -rwx 109 Mar 01 1993 00:04:30 info
22 -rwx 109 Mar 01 1993 00:04:30 info.ver
8 -rwx 3727 Mar 22 2009 10:12:56 config.text
24 -rwx 306 Mar 01 1993 00:03:48 env_vars
25 -rwx 880640 Mar 08 1993 22:39:07 html2.tar
26 -rwx 47 Mar 22 2009 10:12:56 private-config.text
7741440 bytes total (1981952 bytes free)
Adding VLAN's from configure mode
To add VLAN's from configure mode is recomended.
Switch1#configure termi
Switch1#configure terminal
Enter configuration commands, one per line. End with CNTL/Z.
Switch1(config)#vlan 100
Switch1(config-vlan)#name Admin
Switch1(config-vlan)#vlan 101
Switch1(config-vlan)#name Sales
Switch1(config-vlan)#vlan 102
Switch1(config-vlan)#name Students
Switch1(config-vlan)#^Z
Switch1#sh 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
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
Fa0/21, Fa0/22, Fa0/23, Fa0/24
Gi0/1
100 Admin active
101 Sales active
102 Students active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
Adding VLAN's from database mode
You can add VLAN's from vlan database
Switch1#vlan database
% Warning: It is recommended to configure VLAN from config mode,
as VLAN database mode is being deprecated. Please consult user
documentation for configuring VTP/VLAN in config mode.
Switch1(vlan)#vlan 100 name Admin
VLAN 100 added:
Name: Admin
Switch1(vlan)#vlan 101 name Sales
VLAN 101 added:
Name: Sales
Switch1(vlan)#vlan 102 name Students
VLAN 102 added:
Name: Students
Switch1(vlan)#exit
APPLY completed.
Exiting....
Switch1#sh 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
Fa0/13, Fa0/14, Fa0/15, Fa0/16
Fa0/17, Fa0/18, Fa0/19, Fa0/20
Fa0/21, Fa0/22, Fa0/23, Fa0/24
Gi0/1
100 Admin active
101 Sales active
102 Students active
1002 fddi-default active
1003 token-ring-default active
1004 fddinet-default active
1005 trnet-default active
Access Ports
Access Ports are ports that are connected to specific vlans.
Adding a port statically to a VLAN
To put fastethernet 0/7 port in VLAN 102, use the following commands.
Switch1#conf t Enter configuration commands, one per line. End with CNTL/Z. Switch1(config)#interface fastethernet 0/7 Switch1(config-if)#switchport mode access Switch1(config-if)#switchport access vlan 102
Adding a range of ports to a VLAN
To put fastethernet 0/8, 0/9, 0/12, 0/13, 0/14 and 0/22 in VLAN 102
Switch1(config)#interface range fastEthernet 0/8 - 14, fastEthernet 0/22 Switch1(config-if-range)#switchport mode access Switch1(config-if-range)#switchport access vlan 102
To view ports in VLAN Students
Switch1#sh vlan name Students
VLAN Name Status Ports
---- -------------------------------- --------- -------------------------------
102 Students active Fa0/7, Fa0/8, Fa0/9, Fa0/10
Fa0/11, Fa0/12, Fa0/13, Fa0/14
Fa0/22, Gi0/2
VLAN Type SAID MTU Parent RingNo BridgeNo Stp BrdgMode Trans1 Trans2
---- ----- ---------- ----- ------ ------ -------- ---- -------- ------ ------
102 enet 100102 1500 - - - - - 0 0
Remote SPAN VLAN
----------------
Disabled
Primary Secondary Type Ports
------- --------- ----------------- ------------------------------------------