Managed gigabit switches (dgs-1024D) and aggregate/trunking of 2lines into one?

Discussion in 'Windows Networking' started by markm75, Mar 6, 2008.

  1. markm75

    markm75 Guest

    I'm not sure what the terminology is here.. but what do they call
    taking say 2, gigabit lines from a server and combining that bandwidth
    into one bigger pipe of 2GB?

    Is this trunking? Doesnt this require trunking ability on both the
    server nic side and the switch?

    We have the dlink switch, but i dont see how this could be done via
    the interface.. we have intel pro 1000 desktop adapters built into
    several servers *dual nics*.. was trying to find out the technical
    details on how to combine a dual nic card into one on 2003 server..

    Anyone have any info on this?

    Thanks
     
    markm75, Mar 6, 2008
    #1
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  2. markm75

    Yousuf Khan Guest

    Yes, it's called trunking.

    Network Trunking for PM/Ethernet Administrator's Guide
    http://www.pccluster.org/faq/en/reference/pm/ether-trunking.html

    You don't really need to have any support for this within the ethernet
    switcher, but hopefully the switcher won't interfere with it; I'll
    explain that later. How the trunking software works is that it creates a
    virtual ethernet MAC address, which then assigns to all of the physical
    ethernet ports involved in the trunking. Those ports then broadcast and
    receive using the virtual MAC rather than their own physical MACs. To
    all intents and purposes, it looks like there is another ethernet card
    on the network.

    Where the ethernet switch may interfere with this process is if it gets
    confused by seeing the same MAC address coming over multiple ports. The
    etherswitch maintains its own ARP cache where it caches the MAC
    addresses connected to each port. If a MAC address appears in the ARP
    cache on multiple ports, the etherswitch would ideally direct network
    packets to all of these relevant ports in a round-robin fashion.
    However, if the etherswitch is too dumb (or perhaps, too smart) it will
    only direct all of this traffic to only one of the ports and ignore all
    of the other ports. That would just nullify all of the advantages of
    trunking because all traffic would be directed to one port, and one port
    only.

    Yousuf Khan
     
    Yousuf Khan, Mar 20, 2008
    #2
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