topic Re: Can the Default VLAN 1 be deleted or disabled - VCS Logical Chasis in Data Center (SLX)

Can the Default VLAN 1 be deleted or disabled - VCS Logical Chasis

Anonymous — Wed, 20 Mar 2019 19:37:18 GMT

Hi,

Would like to remove or delete the default VLAN 1 as its not being used, but can't find the command to do it if in fact it is possible, see below:

code:

Col-xxx-VSP-Sw11(config-Port-channel-66)# do show vlan brief
Total Number of VLANs configured  : 24
Total Number of VLANs provisioned  : 24
Total Number of VLANs unprovisioned : 0
VLAN       Name      State           Ports      Classification
(F)-FCoE                          (u)-Untagged
(R)-RSPAN                          (c)-Converged
(T)-TRANSPARENT                       (t)-Tagged
================ =============== ========================== =============== ====================
1        default     ACTIVE           Po 10(t)
                              Po 11(t)
                              Po 64(t)
                              Po 65(t)
                              Po 66(t)


Col-xxx-VSP-Sw11(config)# interface Port-channel 66
Col-xxx-VSP-Sw11(config-Port-channel-66)# switchport trunk allowed vlan remove 1

Col-xxx-VSP-Sw11(config)# no interface Vlan 1
%%Error: Not Allowed to Delete Vlan Interface 1

Col-xxx-VSP-Sw11(config)# no vlan ?
Description: Vlan commands
Possible completions:
 classifier  Vlan classification commands
 dot1q    Configure dot1q parameters


Col-xxx-VSP-Sw11# show running-config interface Port-channel 66
interface Port-channel 66
 vlag ignore-split
 switchport
 switchport mode trunk
 switchport trunk allowed vlan add 22,30,64,70-71,146-151,240,252,999,2002,3333
 no switchport trunk tag native-vlan
 spanning-tree shutdown
 no shutdown

As can be seen VLAN 1 is being tagged on port-channel 66. I would like to remove it from all ports, and can see some of the commands I used.

Be grateful for any help.

Many thanks

Re: Can the Default VLAN 1 be deleted or disabled - VCS Logical Chasis

Truyen_Phan — Thu, 21 Mar 2019 08:53:23 GMT

Hi Martin,

Unfortunately, the default VLAN 1 is not allowed to be removed.

Re: Can the Default VLAN 1 be deleted or disabled - VCS Logical Chasis

Anonymous — Thu, 21 Mar 2019 18:05:38 GMT

Hi Truyen,

Thanks for getting back.

Ok. Is there a way to remove the default VLAN from the interface if I can't delete it?

Its being added tagged, so that is some protection if nothing else.

Thanks

Re: Can the Default VLAN 1 be deleted or disabled - VCS Logical Chasis

Michael_Morey — Thu, 21 Mar 2019 21:24:19 GMT

By default switchport trunk interfaces are tagged with the Native VLAN:

code:

VDX1(conf-if-te-1/0/10)# do show run int te 1/0/10
interface TenGigabitEthernet 1/0/10
 switchport
 switchport mode trunk
 switchport trunk allowed vlan add 1000
 switchport trunk tag native-vlan
 spanning-tree shutdown
 fabric isl enable
 fabric trunk enable
 no shutdown
 
VDX1(conf-if-te-1/0/10)# do show vlan bri
Total Number of VLANs configured  : 11  
Total Number of VLANs provisioned  : 11  
Total Number of VLANs unprovisioned : 0  
VLAN       Name      State           Ports      Classification         
(F)-FCoE                          (u)-Untagged
(R)-RSPAN                          (c)-Converged
(T)-TRANSPARENT                       (t)-Tagged
================ =============== ========================== =============== ====================
1        default     ACTIVE           Po 1(t)     
                              Po 2(t)     
                              Po 100(t)    
                              Te 1/0/10(t)   
                              Te 1/0/22(t)

On a default setup, there is no way to remove the native VLAN short of configuring the interface as a L3 interface. That being said, it is possible to accomplish this with the command:

code:

switchport mode trunk-no-default-native

The catch is that this command is only available when "Virtual-Fabric" is enabled

code:

conf t
vcs virtual-fabric enable

Example of completed config:

code:

VDX1# show run int te 1/0/10
interface TenGigabitEthernet 1/0/10
 switchport
 switchport mode trunk-no-default-native
 switchport trunk allowed vlan add 1000
 spanning-tree shutdown
 fabric isl enable
 fabric trunk enable
 no shutdown
!
VDX1# show vlan bri
Total Number of VLANs configured  : 11  
Total Number of VLANs provisioned  : 11  
Total Number of VLANs unprovisioned : 0  
VLAN       Name      State           Ports      Classification         
(F)-FCoE                          (u)-Untagged
(R)-RSPAN                          (c)-Converged
(T)-TRANSPARENT                       (t)-Tagged
================ =============== ========================== =============== ====================
1        default     ACTIVE           Po 1(t)     
                              Po 2(t)     
                              Po 100(t)    
                              Te 1/0/22(t)

I would recommend you review the documentation regarding "Virtual-Fabric" mode to see if it will have any adverse impact to your network. Also please be advised that once you configure the switch port with with "trunk-no-default-native" mode, you will have to re-tag all of your previous VLANs as they are removed anytime you change the switch-port mode.

Thanks,

Mike Morey
Principal Technical Support Engineer

Re: Can the Default VLAN 1 be deleted or disabled - VCS Logical Chasis

Anonymous — Thu, 21 Mar 2019 21:31:07 GMT

Hi Mike,

That's great, thanks for the info.

Cheers,

Martin