3548 and Gigastack - adding more switches 2

[58sniper]

Greets -

Been a while since I've done much with Cisco hardware....

I have 6 WS-C3548-XL-EN switches, connected via GBICs. All is well. I need to add a couple of more, and want to connect them via GBIC as well. My question is - what do I need to do, other than physically connect them? Any configuration?

I have the Cisco Network Assistant, and it does show the existing units.

Any help/comments/links would be greatly appreciated.

Pat Richard, MCSE MCSA:Messaging CNA
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[helpdeskdan]

On 3524MDF6, I'm able to enable the trunking, and create the VLANs and assign ports. However, when I go to the next switch, 3548MDF5, as soon as I issue
switchport mode trunk
I lose my connection to that switch."

Does the trunk come up? Have you done a show interfaces trunk?

 

[58sniper]

The switch stops responding on the g0/1, so I reset the switch to get it working again.

On the 35xx series, I don't see a show interfaces trunk option.

Pat Richard, MCSE MCSA:Messaging CNA
Microsoft Exchange MVP
Want to know how email works? Read for yourself -

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[vipergg]

what commands are you using to setup the trunks ? If you are just going down the stack and telnetted into the box it is very possible you will kill yourself if you telneted thru the only connection . Some prefer to hardcode the trunk myself I always let the switch create the trunk , by useing the "switchport mode dynamic desirable" command , you can then set up the next switch as auto and the trunk should come up . If your telnet path is down thru the stack this also will temporarily kill your session while the trunk is created . In a client/server setup always look at the vtp revision number to determine if the vlans are getting propagated correctly , they should all have the same revision number if it working correctly .

 

[vipergg]

Just looked at your post again and you probably do have to force the trunks on because those switches are old and won't accept the commands in the previous note . Make sure your encapsulation methods are the same on each end , would do that command first before doing the others . Port should look like

interface G0/1
switchport trunk encapsulation dot1q
switchport mode trunk