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New Member

Setting up a trunk over two 2950s

I have two 2950 switches. I am trying to set up a trunk over fa0/1 on both switches. There are no lights on the ports when I connect a cross-over cable. Any suggestions would help. I used the following commands on my first switch (Texas):

en

config t

int fa0/1

switchport mode trunk

speed 100

duplex full

-------------

switch two (Arkansas)

en

config t

int fa0/1

switchport mode dynamic

speed 100

duplex full

----------

Texas#show int fa0/1 switchport

Name: Fa0/1

Switchport: Enabled

Administrative Mode: trunk

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Protected: false

Voice VLAN: none (Inactive)

Appliance trust: none

-------------

Arkansas#show int fa0/1 switchport

Name: Fa0/1

Switchport: Enabled

Administrative Mode: dynamic desirable

Operational Mode: down

Administrative Trunking Encapsulation: dot1q

Negotiation of Trunking: On

Access Mode VLAN: 1 (default)

Trunking Native Mode VLAN: 1 (default)

Trunking VLANs Enabled: ALL

Pruning VLANs Enabled: 2-1001

Protected: false

Voice VLAN: none (Inactive)

Appliance trust: none

------------------------

Arkansas#sho int fa0/1 trunk

Port Mode Encapsulation Status Native vlan

Fa0/1 desirable 802.1q not-trunking 1

----------------

Texas#show int fa0/1 trunk

Port Mode Encapsulation Status Native vlan

Fa0/1 on 802.1q not-trunking 1

3 REPLIES

Re: Setting up a trunk over two 2950s

Hi,

On your Switch2

Change the configuration to Switchport mode trunk like you did in Switch1 so your Switch2 will have this config

switch two (Arkansas)

en

config t

int fa0/1

switchport mode trunk

speed 100

duplex full

connect both switches Fa 0/1 with cross-over and you should see the trunk link comeup green.

Hope This Helps

Shaheen

Purple

Re: Setting up a trunk over two 2950s

Make both ports "switchport mode dynamic desirable" and let the switch negotiate the trunk this way you will know that the trunk is working correctly.

New Member

Re: Setting up a trunk over two 2950s

Hi,

Did you get this figured out?

What version of IOS are you running?

Craig

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