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upgrade core 4506 to 6509

When upgrading a core switch, how does one go about transferring the VLANs?  We are upgrading a 4506 as the core to a 6509.  Do I add the 6509 as a client first, let VTP propogate then change it to a server?  Before doing so I would make sure the config and vlan.dat file were removed correctly.

Cisco Employee

upgrade core 4506 to 6509


Yes you are correct. First before joining the 6500 to the network check the VTP status and the vlans configured locally and also if you want delete the vlan.dat file before connecting it to the network.

{Also changing the VTP mode to Transparent it clears the VTP revision number and stay at 0 but again if this is critical network then do the first method mentioned above to avoid any issues).

Once you complete this task then change the VTP mode to client and connect the switch to the network.

Few things to have in handby before doing anything:

1- Backup the config of 4500

2- Have the basic config on the 6500.




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Re: upgrade core 4506 to 6509


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If you want to push the VLANs by VTP, set the 6509 to transparent or off mode.  Connect to the 4506 via a trunk.  Then set the 6509 to server mode.  As it should then have a lessor database revision number, it will obtain the current VLANs.  (NB: client vs. server doesn't matter in obtaining or distributing the VLAN database, it only controls whether you're allowed to make manual VLAN configuration changes on the device.)

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