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New Member

Catalyst 4006 ,Interface VLAN down,

Hi all,

I have trouble :

I configured VLAN interfaces for catalyst 4006 (VLAN 2, VLAN 3, VLAN 4, VLAN 5, VLAN 6) , each interface have one network IP address, the networks routing by RIP.

The Catalyst 4006 runing normaly.

But today i can not ping VLAN 6, after sh VLAN Interface i saw that:

VLAN interface up , line protocol down,

VLANs remain is normaly

I don't understand why ?

Pls help me resolve this problem.

Thank you very much

Hung, CCNA, Fujitsu

New Member

Re: Catalyst 4006 ,Interface VLAN down,

What version of OS are you using? Are you still using separate CatIOS for the Catalyst and IOS for the router/L3 routing module?

New Member

Re: Catalyst 4006 ,Interface VLAN down,


My Catalyst use

Cisco Internetwork Operating System Software

IOS (tm) Catalyst 4000 L3 Switch Software (cat4000-IS-M), Version 12.1(8a)EW1.

I know this old version, I don't know this version effect to catalyst activity .

Thanks for help me.

see you

New Member

Re: Catalyst 4006 ,Interface VLAN down,

BTW, I'm running Cat4006 with L3 routing module (and also external 3662) router at the moment so I can most probably help you out with your problem.

Cisco Employee

Re: Catalyst 4006 ,Interface VLAN down,

Do you have any active ports in VLAN6? If not the L3 VLAN interface will shut down due to auto-state

New Member

Re: Catalyst 4006 ,Interface VLAN down,


You need to create the vlan in the vlan database.

Please do.

conf t

vlan 1-6

state active




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