i have 2 3560 trunked together and currently working (by show cdp neighbor and ping). i would like to verify with you guys if changing the switchport mode from access (removing the switchport mode access and switchport access vlan x lines) to trunk (switchport mode trunk) will cause a temporary disconnection or outage on the other switch. below is the config i want to accomplish:
does this mean i would lose my telnet session on the remote switch after issuing the 'switchport mode trunk command'? am i able to re-connect on the same session (after waiting for few seconds) or do i need to open another one?
One thing to note, is that this will also enable Dynamic Trunking Protocol or DTP. This is important to note because the 3560 default is to be "dynamic auto". This essentially means that the switch will wait for the opposing end to initiate the trunk. If both ends are set to "dynamic auto" a trunk will not form. To disable DTP frame from being generated on the trunk:
Entering this command will force the port to trunk. You would want to put this on both ends of a trunk.
To be safe, copy the vlan numbers that are currently traversing those interfaces that are to be modified to trunk, and make sure that you explicitly allow those on the trunk. To be safe, allow all vlans through, so to ensure connectivity. Once you have confirmed that both ends of the trunk are properly working and you can ping devices on those respective vlan, manually prune the trunk links by removing the unnecessary vlans from the trunk using the command:
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