I recently installed two HP ProCurve 2510G 48-port Ethernet switches for a customer.  Their VMware vSphere 4 hosts are connected to both switches for network high-availability for the Service Console, VMotion and iSCSI traffic to their EMC AX4 SAN.

As part of the configuration I wanted to trunk four ports together on each switch to provide a 4 GB inter-switch link.  Unfortunately there's no way to do this from the web-based GUI, and it's necessary to open a telnet session to the switch and type the commands.  Finding the correct commands in the switch documentaiton is a pain, but once you find the commands and understnad the concepts, it becomes a trivial task.

In my case I wanted to trunk the last four ports on my switches (ports 45-48).  I wanted the trunk assigned to the default VLAN so they could be used to pass traffic between the switches.  Here are the command to do this: