Trunking two switches

[lobo66]

Having a liitle problem trunking two switches..

I have a
2950 with IOS here is my int conf:
interface FastEthernet0/24
description chi-cat2980-
switchport trunk native vlan 1000
switchport mode trunk
no ip address
duplex full
speed 100

Then on my 2948 I am trying to trunk this to port 2/2

I have run the set trunk 2/2 on dot1q 1000 .. but when I status the switch port is says not connected.. also it does not indicate its trunking?? THX ALL...

 

[Phobos1821]

Please post the configuration from the 2948 side.

Also post the display from both devices
sho int trunk
show vlan

Also this is basic, but must be asked. You are using a CROSSOVER cable between the switches? Yes? Otherwise they are not physically connected.

 

[ADB100]

The CatOS commands for setting the Native VLAN are slightly different from IOS....

set vlan 1000 2/2
set trunk 2/2 on dot1q

The first command sets the access VLAN to 1000 and if the port is operating as a trunk sets the Native VLAN to 1000. From your IOS config you are allowing all VLAN's - the equivilent configs for restricting VLANs on trunks (recommended to keep each STP to a minimum)

IOS
interface fastethernet0/24
switchport trunk allowed vlan 10,20
!
CatOS
set trunk 2/2 on dot1q 10,20
clear trunk 2/2 1-9,11-19,21-1005,1025-4094
!

Also make sure the relevent VLANs exist on each switch.

Good luck

Andy
Good luck

 

[vipergg]

On the 2950
switchport trunk native vlan 1000
switchport mode dynamic desirable

2948

set trunk 2/2 desirable dot1q

 

[ADB100]

vipergg - That will not work unless you specify the Native VLAN on the CatOS end -

set vlan 1000 2/2

As I said in my previous post.........

Andy

 

[vipergg]

Thats true , set vlan 1000 2/2 . Just forgot to put it in .