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Configure etherchanneled trunk with dot1q encapsulation on a cisco 2950 switch

Hello All,

I have a cisco 2950 series catalyst switch.  I setup port fa0/23 - 24 to be an ether-channel and a trunk, with the ether-channel being named Port-channel1.

I want to configure the trunk to use dot1q encapsulation.  So, under Port-channel1 configuration i try to enter the command "switchport trunk encapsulation dot1q", and it doesn't take.  In fact, here's what shows up when I use the help function:

Switch(config-if)#switchport trunk ?
  allowed  Set allowed VLAN characteristics when interface is in trunking mode
  native   Set trunking native characteristics when interface is in trunking mode
  pruning  Set pruning VLAN characteristics when interface is in trunking mode

Notice there is no "encapsulation" option.

So, can 2950's change encapsulatioin or do they always use ISL?  If so, how can I change it?

thanks,
Mark
0
fbrsupport
Asked:
fbrsupport
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2 Solutions
 
JFrederick29Commented:
Actually, the 2950 only supports 802.1Q so that is why the option to set encapsulation is not present.
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fbrsupportAuthor Commented:
Thanks for the quick reply... but check thiis out....

Switch(vlan)#show current
  VLAN ISL Id: 1
    Name: default
    Media Type: Ethernet
    VLAN 802.10 Id: 100001
    State: Operational
    MTU: 1500
    Backup CRF Mode: Disabled
    Remote SPAN VLAN: No

From the output, looks like ISL is being used.

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Galtar99Commented:
I think you set encapsulation under the port group or individual/range of ports.  See this example:

http://www.cisco.com/en/US/tech/tk389/tk213/technologies_configuration_example09186a0080094bc5.shtml
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JFrederick29Commented:
Actually try these commands:

show int trunk
show int fa0/23 switchport

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fbrsupportAuthor Commented:
Thanks for the link Galtar99!

JFred (kinda sounds like K-Fed, hahahahah, ok my mind is going on a tangent),
anyhow...

sh int trunk - didn't show anything
 BUT
check this out:
Switch#sh int fa0/23 switchport
Name: Fa0/23
Switchport: Enabled
Administrative Mode: trunk
Operational Mode: down (suspended member of bundle Po1)
Administrative Trunking Encapsulation: dot1q
....

It shows dot1q here!  

thanks guys,
Mark
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JFrederick29Commented:
The administrative/operational encap is what you should be looking at to verify.
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Galtar99Commented:
Do the following show you what you expect to see?

show port channel
show etherchannel or show port group
show interfaces trunk
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fbrsupportAuthor Commented:
Here ya go galtar

Switch#sh port channel
               ^
% Invalid input detected at '^' marker.

________________________________________

Switch#sh etherchannel
                Channel-group listing:
                -----------------------

Group: 1
----------
Group state = L2
Ports: 2   Maxports = 8
Port-channels: 1 Max Port-channels = 1
Protocol:    -

________________________________________

Switch#show interfaces trunk

Switch#  (no output)
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