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Adamzhang
Beginner

vlan1 shutdown and doesn't recognise the vlan command

Hi,

I got a Cisco 3548 switch with Version 12.0(5)WC5 image. I know it is an old image, needed to be update. But I am not at the position to update it now.

I encounter two problems:

1. The interface vlan1 is always in "shutdown" state. see the config below. If I do "no shut", switch accepts the command, but doesn't actually remove that line with "shutdown".

interface VLAN1
ip address 10.10.0.10 255.255.255.0
no ip directed-broadcast
no ip route-cache
shutdown
end

switch1#sh int vlan 1
VLAN1 is up, line protocol is down

switch1#sh vlan bri
VLAN Name                             Status    Ports
---- -------------------------------- --------- -------------------------------
1    default                          active    Fa0/3, Fa0/4, Fa0/5, Fa0/6,

2. I can't configure more vlan

switch1#conf t
Enter configuration commands, one per line.  End with CNTL/Z.
switch1(config)#vlan 103
                  ^
% Invalid input detected at '^' marker.

The "sh int trunk" doesn't work neither.

Can any one advise what is going on with this switch?

Thanks
Stro

3 REPLIES 3

Hi,

CISCO 3548 switch is an L2 switch, at a time only one L3 vlan interface will be up.That interface can be used to manage the switch.

If you want to create more that one Layer 2 vlan, then go to vlan database mode, then try to configure.

#config t

(config)#vlan database

(config-vlan)#vlan 123

Thanks

Karuppu

Edison Ortiz
Hall of Fame Mentor

switch1#sh int vlan 1
VLAN1 is up, line protocol is down

This indicates the Vlan is not longer in shutdown mode contrary to what you said.

The reason the Vlan isn't up/up is that you need a device connected to a port that participates on Vlan1.

Regards,

Edison.

glen.grant
Advisor

Follow Karuppu's advice.  You cannot create vlans in global mode on a switch that old . You have to create any new vlans in vlan database mode.   If you no shut vlan 1 then that shutdown command should dissapear and it would be in a up/down state until you get a active link in the vlan .  If it is not dissapearing  then make sure there is not already another L3 SVI configured in the up state , you can only have a single SVI active because it is only used to manage the switch.