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How do I trunk a Cisco 2950 to a Cisco 3550 switch
I am adding an additional network at my office. The new network is going to be on a cisco 2950 switch that is connected to a "Layer 3" Cisco 3550 switch. I have the ports on the 2950 going to the 3550 set as "switchport mode trunk". On the 3550, I have the port configured with "switchport trunk encapsulation dot1q" I can't get these two switches to communicate. Any Ideas?
ASKER
Thanks. On the 2950, the command "switchport mode trunk" works, but "switchport trunk encapsulation dot1q" does not. It will work on the 3550?
ASKER
Any other ideas?
Sorry - 2950 only supports dot1q so you won't have to run the command on its interface.
Use both commands on the 3550 ports.
Use both commands on the 3550 ports.
ASKER
Still not working. My 3550 is a 10 port fiber switch. I have run the command "switchport trunk encapsulation dot1q" on the 3550 for the port that the 2950 connects to. I still can't communicate between switches
Can you post a config of both?
ASKER
First config is the 2950. Second config is the 3550. The 2950 connects to int gigabitethernet 0/7 on the 3550.
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname 2950
!
clock timezone est -5
clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
ip subnet-zero
!
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface GigabitEthernet0/1
switchport mode trunk
!
interface GigabitEthernet0/2
switchport mode trunk
!
interface Vlan1
ip address 10.0.32.2 255.255.240.0
no ip route-cache
!
ip default-gateway 10.0.32.1
ip http server
!
!
!
end
Cisco 3550
Building configuration...
Current configuration : 3071 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3550
!
no logging console
!
clock timezone EST -5
clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
ip subnet-zero
ip routing
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
interface GigabitEthernet0/1
no ip address
!
interface GigabitEthernet0/2
no ip address
!
interface GigabitEthernet0/3
no ip address
!
interface GigabitEthernet0/4
no ip address
!
interface GigabitEthernet0/5
no ip address
!
interface GigabitEthernet0/6
no ip address
!
interface GigabitEthernet0/7
switchport trunk encapsulation dot1q
no ip address
!
interface GigabitEthernet0/8
no ip address
!
interface GigabitEthernet0/9
no ip address
!
interface GigabitEthernet0/10
no ip address
!
interface GigabitEthernet0/11
!
interface GigabitEthernet0/12
no ip address
!
interface Vlan1
no ip addresss
!
interface Vlan2
no ip address
!
interface Vlan20
description TEST
ip address 10.0.32.1 255.255.240.0
!
interface Vlan30
no ip address
end
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
service password-encryption
!
hostname 2950
!
clock timezone est -5
clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
ip subnet-zero
!
!
spanning-tree mode pvst
no spanning-tree optimize bpdu transmission
spanning-tree extend system-id
!
!
!
interface FastEthernet0/1
!
interface FastEthernet0/2
!
interface FastEthernet0/3
!
interface FastEthernet0/4
!
interface FastEthernet0/5
!
interface FastEthernet0/6
!
interface FastEthernet0/7
!
interface FastEthernet0/8
!
interface FastEthernet0/9
!
interface FastEthernet0/10
!
interface FastEthernet0/11
!
interface FastEthernet0/12
!
interface FastEthernet0/13
!
interface FastEthernet0/14
!
interface FastEthernet0/15
!
interface FastEthernet0/16
!
interface FastEthernet0/17
!
interface FastEthernet0/18
!
interface FastEthernet0/19
!
interface FastEthernet0/20
!
interface FastEthernet0/21
!
interface FastEthernet0/22
!
interface FastEthernet0/23
!
interface FastEthernet0/24
!
interface GigabitEthernet0/1
switchport mode trunk
!
interface GigabitEthernet0/2
switchport mode trunk
!
interface Vlan1
ip address 10.0.32.2 255.255.240.0
no ip route-cache
!
ip default-gateway 10.0.32.1
ip http server
!
!
!
end
Cisco 3550
Building configuration...
Current configuration : 3071 bytes
!
version 12.1
no service pad
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname 3550
!
no logging console
!
clock timezone EST -5
clock summer-time EDT recurring 2 Sun Mar 2:00 1 Sun Nov 2:00
ip subnet-zero
ip routing
!
!
spanning-tree mode pvst
spanning-tree extend system-id
!
!
!
interface GigabitEthernet0/1
no ip address
!
interface GigabitEthernet0/2
no ip address
!
interface GigabitEthernet0/3
no ip address
!
interface GigabitEthernet0/4
no ip address
!
interface GigabitEthernet0/5
no ip address
!
interface GigabitEthernet0/6
no ip address
!
interface GigabitEthernet0/7
switchport trunk encapsulation dot1q
no ip address
!
interface GigabitEthernet0/8
no ip address
!
interface GigabitEthernet0/9
no ip address
!
interface GigabitEthernet0/10
no ip address
!
interface GigabitEthernet0/11
!
interface GigabitEthernet0/12
no ip address
!
interface Vlan1
no ip addresss
!
interface Vlan2
no ip address
!
interface Vlan20
description TEST
ip address 10.0.32.1 255.255.240.0
!
interface Vlan30
no ip address
end
Please post the output of a "show int status" for both switches.
ASKER CERTIFIED SOLUTION
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ASKER
Thanks, I can't believe I overlooked that. I put them both in the same vlan and was then able to pass traffic with no problem
switchport trunk encapsulation dot1q
switchport mode trunk
If I read the above right you have half the answer on each port.
Cheers