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10.08.2007 at 09:33AM PDT, ID: 22879196
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Configure etherchanneled trunk with dot1q encapsulation on a cisco 2950 switch
Tags: 2950, cisco, trunk, encapsulation, dot1q
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
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Question Stats
Zone: Networking
Question Asked By: fbrsupport
Solution Provided By: Galtar99
Participating Experts: 2
Solution Grade: A
Views: 153
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10.08.2007 at 09:42AM PDT, ID: 20035223

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10.08.2007 at 09:48AM PDT, ID: 20035265

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10.08.2007 at 09:50AM PDT, ID: 20035286

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10.08.2007 at 09:52AM PDT, ID: 20035299

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10.08.2007 at 10:11AM PDT, ID: 20035399

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10.08.2007 at 10:15AM PDT, ID: 20035420

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10.08.2007 at 10:33AM PDT, ID: 20035552

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10.08.2007 at 09:42AM PDT, ID: 20035223

Rank: Master

Actually, the 2950 only supports 802.1Q so that is why the option to set encapsulation is not present.
 
10.08.2007 at 09:48AM PDT, ID: 20035265
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.

 
10.08.2007 at 09:50AM PDT, ID: 20035286
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
Accepted Solution
 
10.08.2007 at 09:52AM PDT, ID: 20035299

Rank: Master

Actually try these commands:

show int trunk
show int fa0/23 switchport

Assisted Solution
 
10.08.2007 at 10:11AM PDT, ID: 20035399
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
 
10.08.2007 at 10:15AM PDT, ID: 20035420

Rank: Master

The administrative/operational encap is what you should be looking at to verify.
 
10.08.2007 at 10:33AM PDT, ID: 20035552
Do the following show you what you expect to see?

show port channel
show etherchannel or show port group
show interfaces trunk
 
 
10.08.2007 at 10:50AM PDT, ID: 20035672
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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