I had actually used VTP in my network, but they didn't and the VTP operating mode of all of their switches were still the default - "server". VTP configuration information is stored in the VLAN database, which is NOT deleted when one clears the config. Six months later, I get a call from their head engineer informing me that I had taken down the entire datacenter. Before I returned it, I wiped the config. which reminded me how frustrating VTP can be.įor example, years ago, I borrowed one of these 2950's from the datacenter where I have a few cabinets. When I attempted to blank out the config, I couldn't get rid of the VLANs. really old hardware, but it was just lying around collecting dust and it could do what I needed, so why not? The networks were all connected with a Cisco 2950 24-port switch using VLAN and a Cisco 2601 configured as a router-on-a-stick. Well, the Cisco engineer couldn't figure out what was wrong, so I pulled a couple of routers out of the network and set up a small lab so the engineer could remote in and play with it. (The firewalls in the diagram were ASAs). I wasn't using the firewall feature just routing. The basic problem was that I couldn't get the routers to route traffic in this kind of environment: I recently had some issues with a few low-end Cisco routers (RV325) and I opened a case with Cisco TAC. Make sure you have backed up your switch!!! WARNING: If you follow the instructions here, you will wipe out your VTP and VLAN configurations.
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