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HP Procurve 1700, network switch, trunking question

I bought a ProCurve 1700-8 switch and am trying to understand the trunking feature.  This is what was provided in the documentation:

Trunking allows you to assign
physical links to one logical link (trunk) that functions as a single, higherspeed
link providing dramatically increased bandwidth. This capability
applies to connections between backbone devices as well as to connections
in other network areas where traffic bottlenecks exist.

I haven't been able to find any information on what scenerios I might use this feature for.  I found a lot of info for Cisco devices, but that seems to involve linking multiple switches instead of individual ports on the same switch.  I'm planning to use this switch between our T1 router and a few firewalls that share the T1.  I bought this because the product description led me to believe I could assign bandwidth limits to different ports, but haven't found any way to do this.  The switch also has VLAN capability.  Can anyone provide more information on trunking for this device and how I might use it?

Thanks.
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tvman_od
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This describes etherchannel functionality, when you bundle multiple ports together to combine its bandwidth. Actuall trunking is a feature when you can send traffic for multiple VLANs over a single port amd keep it separated. There is standard 802.1q protocol and cisco proprietary ISL.
Traffic limiting could be done using policer or shaper. Personaly I don't know how to configure it for HP, Ciscos are welcome.
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How would you combine ports together to increase bandwidth?  I can't picture a scenerio that you would use that feature.  That's what I'm trying to figure out.    
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tvman_od
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Cisco and HP use the term trunk differently.
- and so do experts :-)