programming trunk without disruption

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Hi all.
  Say I have a 3560 and a 2950 switch connected as a normal switchport
vlan. If one were to change that link to be a trunk what is the best
method to use so that service is not impacted(ie. the link doesnt go
down). I've found that programming the trunk on the last link (in this
case the 2950) then the 3550 works but there is a minor service
disruption. Any suggestions appreciated. Also would Ciscoworks do a
better job in handling something like this?

many thanks

Re: programming trunk without disruption

AS far as I know, there is no way to avoid a brief pause in passing
packets on that interface.
The int won't go down necessarily, but will cause a dropout.
Maintenance window stuff for sure.

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