Re: Removal of Vlan

newnetman · ‎09-21-2007

Hello All,

Why is that when i remove a Vlan, the interface associated it is not return to the list of default Vlan interfaces?.

Hence whenever a new Vlan is created the formerly removed interface is automatically assigned to the newly created Vlan.

How can i return the removed Vlan's interface number to the list of the default interfaces where a new choice ould be made?

Thanking all in advance

nambi_gct · ‎09-21-2007

can you please provide the relevent show output and the cofiguration.

Jagdeep Gambhir · ‎09-21-2007

It seems to be they way IOS works. Here is what I get, the interface was assigned back to vlan 30 and not to vlan 34

AAASWITCH(config)#vlan 30

AAASWITCH(config-vlan)#exit

AAASWITCH(config)#do show vlan

VLAN Name Status Ports

1 default active

Fa0/29, Fa0/30, Fa0/31, Fa0/32

Fa0/33, Fa0/34, Fa0/36, Fa0/37

2 VLAN0002 active

30 VLAN0030 active Fa0/35

34 VLAN0034 active

35 VLAN35 active

37 VLAN0037 active

AAASWITCH(config)#no vlan 30

AAASWITCH(config)#do 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

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

Fa0/25, Fa0/26, Fa0/27, Fa0/28

Fa0/29, Fa0/30, Fa0/31, Fa0/32

Fa0/33, Fa0/34, Fa0/36, Fa0/37

2 VLAN0002 active

34 VLAN0034 active

35 VLAN35 active

37 VLAN0037 active

AAASWITCH(config)#vlan 34

AAASWITCH(config-vlan)#exit

AAASWITCH(config)#do 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

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

Fa0/25, Fa0/26, Fa0/27, Fa0/28

Fa0/29, Fa0/30, Fa0/31, Fa0/32

Fa0/33, Fa0/34, Fa0/36, Fa0/37

2 VLAN0002 active

34 VLAN0034 active

35 VLAN35 active

37 VLAN0037 active

AAASWITCH(config)#vlan 30

AAASWITCH(config-vlan)#exit

AAASWITCH(config)#do 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

Fa0/13, Fa0/14, Fa0/15, Fa0/16

Fa0/17, Fa0/18, Fa0/19, Fa0/20

Fa0/21, Fa0/22, Fa0/23, Fa0/24

Fa0/25, Fa0/26, Fa0/27, Fa0/28

Fa0/29, Fa0/30, Fa0/31, Fa0/32

Fa0/33, Fa0/34, Fa0/36, Fa0/37

30 VLAN0030 active Fa0/35

Ideally it should go back to default vlan.

Regards,

~JG

nambi_gct · ‎09-21-2007

As long as you have "switchport access vlan x" configured for the interface, the interface will be associated with vlan x, even if vlan x is not created.When you remove this command the port becomes part of vlan1.Hope this clarifies.

lamav · ‎09-21-2007

Maybe it depends on the switch's IOS version because I always thought that the switchport will default to vlan 1 if the vlan to which it belonged was ever removed....?