Question

Configure etherchanneled trunk with dot1q encapsulation on a cisco 2950 switch

Asked by: fbrsupport

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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Asked On
2007-10-08 at 09:33:11ID22879196
Tags

encapsulation

,

2950

,

cisco

,

dot1q

,

switch

Topics

Network Design & Methodology

,

Network Switches & Hubs

Participating Experts
2
Points
250
Comments
8

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Answers

 

by: JFrederick29Posted on 2007-10-08 at 09:42:59ID: 20035223

Actually, the 2950 only supports 802.1Q so that is why the option to set encapsulation is not present.

 

by: fbrsupportPosted on 2007-10-08 at 09:48:01ID: 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.

 

by: Galtar99Posted on 2007-10-08 at 09:50:21ID: 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

 

by: JFrederick29Posted on 2007-10-08 at 09:52:32ID: 20035299

Actually try these commands:

show int trunk
show int fa0/23 switchport

 

by: fbrsupportPosted on 2007-10-08 at 10:11:54ID: 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

 

by: JFrederick29Posted on 2007-10-08 at 10:15:47ID: 20035420

The administrative/operational encap is what you should be looking at to verify.

 

by: Galtar99Posted on 2007-10-08 at 10:33:47ID: 20035552

Do the following show you what you expect to see?

show port channel
show etherchannel or show port group
show interfaces trunk

 

by: fbrsupportPosted on 2007-10-08 at 10:50:36ID: 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)

20120131-EE-VQP-002

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