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Connecting Cisco 3550 w/ GBIC copper to 2950 1000base T

Posted on 2009-02-22
Medium Priority
Last Modified: 2012-05-06
Trying to connect these 2 switches together and no luck.  I do have 2 VLAN's but only using the 1 on the 2950.  Have a crossover cable connecting and same gateway etc...  I have a similiar config at another site, but not using GBIC's or 1000 Base T, so not sure if that changes the rules???  Thanks - Jeff
Question by:jeff0701
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Expert Comment

by:Don Johnston
ID: 23706238
When you say "no luck", what exactly do you mean?

Are you not getting a link light?
Do you have an amber link light?
Do you have a green link light but no traffic is passing.

You'll have to be more specific.

It may also help if we can see the configs for the ports on the two switches.

Author Comment

ID: 23706252
I am getting "Green" link lights on both ends but can't ping each other.  I am working on posting both configs.  Here is the "core" 48 port config.
LVL 50

Expert Comment

by:Don Johnston
ID: 23706289
Please identify what port on each switch is connected to the other switch.

Do you have a VLAN interface with an IP address of the 2950?

If you issue the "show cdp neighbor" command, do you see the other switch?

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Author Comment

ID: 23706298
Here is the 2950 config

Author Comment

ID: 23706301
on the 3550 gig 0/2 and same on the 2950
LVL 50

Accepted Solution

Don Johnston earned 2000 total points
ID: 23706343
Your problem is that you've got a VLAN mismatch between the switches.

The g0/2 port on the 3550 is an access port in VLAN 2.

The g0/2 port on the 2950 is an access port in VLAN 1

They need to be in the same VLAN. Since the management of the 2950 is using VLAN 1, you'll need to change the 3550 port g0/2 so it's in VLAN 1.

Or you could make the link between the switches a trunk.

Author Comment

ID: 23706411
DON you are THE MAN!  Not that familiar with Cisco or VLAN's for that matter obviously!  I switched the 2950 over to VLAN 2 and changed the ports over to that and off it went!  Perfect!!!  Thank you for all your help especially on a Sunday.

Author Closing Comment

ID: 31549838

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