12-08-2007 04:33 PM - edited 03-05-2019 07:53 PM
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
12-08-2007 05:01 PM
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
12-08-2007 05:30 PM
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.
12-13-2007 11:22 AM
Hi,
Did you get this figured out?
What version of IOS are you running?
Craig
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