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Trunking between 2 3550's
Guys,
I am trying to set up a trunk link between 2 3550 switches but cannot get the trunk link to form. I am connecting port f0/1 on the access switch to port f0/1 on the distribution switch. I have run the following commands under f0/1 on each switch:
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 99
switchport mode trunk
switchport nonegotiate
logging event trunk-status
no shut
The output from sh int f0/1 switchport on both switches is as follows:
Access Switch
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 99 (Inactive)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Distribution Switch
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 99 (Inactive)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
--More--
Notce that the operational Mode is DOWN. I have tried lots of different things but cannot get this trunk to form. I will be eternally grateful to anyone who cna help.
Thanks a million
Damien
I am trying to set up a trunk link between 2 3550 switches but cannot get the trunk link to form. I am connecting port f0/1 on the access switch to port f0/1 on the distribution switch. I have run the following commands under f0/1 on each switch:
interface FastEthernet0/1
switchport trunk encapsulation dot1q
switchport trunk native vlan 99
switchport mode trunk
switchport nonegotiate
logging event trunk-status
no shut
The output from sh int f0/1 switchport on both switches is as follows:
Access Switch
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 99 (Inactive)
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk private VLANs: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
Protected: false
Unknown unicast blocked: disabled
Unknown multicast blocked: disabled
Distribution Switch
Name: Fa0/1
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down
Administrative Trunking Encapsulation: dot1q
Negotiation of Trunking: Off
Access Mode VLAN: 1 (default)
Trunking Native Mode VLAN: 99 (Inactive)
Administrative Native VLAN tagging: enabled
Voice VLAN: none
Administrative private-vlan host-association: none
Administrative private-vlan mapping: none
Administrative private-vlan trunk native VLAN: none
Administrative private-vlan trunk Native VLAN tagging: enabled
Administrative private-vlan trunk encapsulation: dot1q
Administrative private-vlan trunk normal VLANs: none
Administrative private-vlan trunk associations: none
Administrative private-vlan trunk mappings: none
Operational private-vlan: none
Trunking VLANs Enabled: ALL
Pruning VLANs Enabled: 2-1001
Capture Mode Disabled
Capture VLANs Allowed: ALL
--More--
Notce that the operational Mode is DOWN. I have tried lots of different things but cannot get this trunk to form. I will be eternally grateful to anyone who cna help.
Thanks a million
Damien
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wastedtime
Member Posts: 586 ■■■■□□□□□□
You may want to make sure the cable is a crossover cable and double check there isn't a problem with the cable. -
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accely
Member Posts: 101
I agree here. I've mistakenly had a ST cable plugged many times!wastedtime wrote: »You may want to make sure the cable is a crossover cable and double check there isn't a problem with the cable.
Make sure it's a cross over Progress: CCIE RS Lab scheduled for Jan. 2012
Equipment: Cisco 360 program racks -
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Damienm30
Member Posts: 3 ■□□□□□□□□□
Guys,
Thank you so much for saving me! I have spent some much time inspecting configs and reading Cisco docs that I overlooked the cabling. I am indeed using the wrong cable. dooooh!! Guess I learned lots about Trunking as a result. Thanks again for the prompt replies.
Damien -
Optionssides14
Member Posts: 113
I always use different color cables to prevent this type of situation.
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Optionswastedtime
Member Posts: 586 ■■■■□□□□□□
I was figuring that most people now a day’s use auto sensing mdi/mdi-x devices that they sometimes forget when a device isn't. I think I still got a switch (switching hub I believe is what they called it) somewhere that has a dedicated uplink port.