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New Member

Cat 2970 Switch Configuration

We have been using Cat 2950 switches and they have worked very well for us. We just bought 2 Cat 2970 switches. I am trying to add them to our network, but they won't play nice. Initially, I couldn't get them to pass any traffic. After a bunch of tinkering, I finally got the trunk link up, but I still can't get get the hosts to ping past the new switch. The old switches are running IOS 12.1 and the new ones run 12.2. Is there anything that changed between versions that I need to look at?


Re: Cat 2970 Switch Configuration

Hi Michael,

If it is only a connectivity issue then I am sure it is not related to IOS code.

Make sure trunk is up, vlans allowed list match on both the ends and native vlas also matches.

If the 2 switches are in same vlan try to initiate the ping from one switch to another and see the results.

I mean just check basic connectivity issues.




Re: Cat 2970 Switch Configuration

Shouldn't be any difference . Checked things like what is allowed across the trunk on "both" sides . Make sure the layer 2 vlan was created on the switch not just put on the switchports . Your vlans should show up with the "show vlan" command . Check default gateway on clients ...

New Member

Re: Cat 2970 Switch Configuration

I think I may have solved the problem. I put a 2950 in its place and got it working, now I need to replace the 2970 and make sure it still works. I had two problems. First, I assigned the wrong IP address to the switch. Second, I forgot I assigned a VTP password, so the VLAN database wasn't being received by the switch.

New Member

Re: Cat 2970 Switch Configuration

In regards to your "tinkering" I would first suggest clearing out (erase start) the switch and reloading it. Now that you know how to setup the TRUNK portion, config that first. Once the trunk/uplink are showing UP/UP begin further, debug. Also, is STP playing any factor? Can you add the running config to this post to assist further & well as how many vlans or if VTP is implemented. Finally, can you paste a running-config of a neighboring SW? Thx

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