HP Procurve 1700, network switch, trunking question

Posted on 2007-10-11
Last Modified: 2008-05-24
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?

Question by:ITLighthouse
    LVL 11

    Expert Comment

    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.
    LVL 1

    Author Comment

    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.    
    LVL 11

    Accepted Solution

    Look at this artikle, it explains why and how.

    Let's assume you have 2 x48 ports switches and bunch of servers connected to it. And application on servers communicate to other servers. Some servers connected to the same switch will be able to communicate at full speed using internal bus. Others will need to cross uplink and it will be a narrow place. Etherchannel helps you to increase bandwidth on the uplink.

    Another example, you have a heavy loaded fileserver with a huge cache in RAM, so it serves clients fast, but you need to use special clustering or load balansing systems to use multiple NICs. Ether channel allows you to just bundle mupltiple physical interfaces to a sinlgle logical with higher throughput.

    And make a note it's not trunking.
    LVL 17

    Expert Comment

    Cisco and HP use the term trunk differently.
    - and so do experts :-)

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