VLAN administratively down

[sfabel]

Hi all,

read the posts regarding vlans that are administratively down, they suggested that they are down if no ports are assigned to them, however I do have a switchport assigned, and the interface is still down. This is on the vtp server and on the clients. The vlan is not listed when issuing show vlan brief. Other vlans configured in a similar way do show and their interfaces are up. These are two Catalyst 4948-10G.

Cisco IOS Software, Catalyst 4500 L3 Switch Software (cat4500-IPBASEK9-M), Version 12.2(53)SG5, RELEASE SOFTWARE (fc1)

Any ideas how to proceed to debug this?

Thanks,

Stephan

[Reza Sharifi]

Hi,

Can you post sh run?

What is vlan Id you are trying to create and what physical port is assigned to it?

also, is the physical port in up and up mode?

sh ip int bri

HTH

[sfabel]

Hi Reza,

relevant sections from sh run:

!

interface GigabitEthernet1/10

switchport access vlan 100

switchport mode access

!

interface Vlan100

ip address 192.168.0.3 255.255.255.0

standby 253 ip 192.168.0.253

standby 253 priority 120

standby 253 preempt

!

cat4948-00#sh ip int bri

Interface              IP-Address      OK? Method Status                Protocol

Vlan1                  unassigned      YES NVRAM  up                    up

Vlan100                192.168.0.3     YES manual down                  down

...

GigabitEthernet1/10    unassigned      YES unset  up                    up

...

thanks for your prompt reply!

[Reza Sharifi · Accepted solution]

Did you also create the layer-2 vlan?

config t

vlan 100

name test

exit

now do 

sh vlan id 100 or

sh int vlan 100

HTH

[sfabel]

Hi Reza,

thanks a ton that led me to find the underlying cause. For whatever reason, my vtp server was not "primary server". I didn't even know such a thing existed. I made it primary server, and was able to add the vlan as you suggested. The rest worked like a charm.

Thanks,

Stephan

[Reza Sharifi]

Glad to help Stephan

Also, remember, if you are in vtp client mode, you can't add any vlan to the switch.  In general, if you are not using vtp and really don't need it, just put the switch in transparent mode, which equals to no vtp.

Reza