How to REMOTELY change trunking encapsulation from default to Dot1q

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May 8th, 2009
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I've got seven 3500XL switches at a remote site that are gigastacked and have "switchport mode trunk" on all gigastack interfaces. What's the preferred way to remotely change trunking to Dot1q. I discovered in the lab that I can't just add "switchport trunk encap dot1q". This locked up the management VLAN on all switches and I lost connectivity. Debugging spanning-tree events revealed unknown Dot1q BPDUs forced blocking on all VLANS. Good thing I didn't try this at a production site. Looking for any sugguestions...


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glen.grant Fri, 05/08/2009 - 05:45
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Probably to modify your backup files and then send it startup config and then at a given safe time reload all the switches .

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