SQUIT

Usage: SQUIT <server> <reason>
Causes the specified server to be disconnected from the network. Use the CONNECT command to connect the server back to the network.
Examples:
/squit irc.webmaster.com I want to connect you to another hub.
This is done to reroute a server. A server cannot connect to another server on the same network. So you have to SQUIT a server before you can reconnect it. You might wish to GLOBOPS before rerouting, in case someone has a good reason not to reroute. It is also nice to WALLOPS before squiting, so that users who wish to be kept informed will expect the split.