Re: Aggregate network interfaces

From: Evgueni V. Gavrilov (aquatique_at_rusunix.org)
Date: 08/26/05

  • Next message: John-Mark Gurney: "Re: Aggregate network interfaces" 
    To: freebsd-net@FreeBSD.org
Date: Fri, 26 Aug 2005 07:23:01 +0200 (CEST)

    In article <1125031757.79719.TMDA@seddon.ca> you wrote:

    > Oh wow! That's cool. I missed that somehow. The 'man' page doesn't
    > mention the hash functions options.
    >
    > On the Cat 6500s you can log into the Sup and change the hash function so
    > it's not just IP, but rather IP+Port. I've previously used this to balance
    > the load across multiple gig links with traffic going to a sinlge backup
    > host, for example. (I you want to know how I'll have to look that up)

    Fast EtherChannel/GigaChannel does ballance itself AFAIK

    upon closing kern/85239 (by emax, not me) I did some tests, and one of them was parallel transfers (input/output) to/from several hosts. so I noticed funny balancing: transfers to/from one host ballanced over 2 interfaces in the bundle so that incoming traffic goes through one interface, outgoing traffic goes through another. further transfers from/to another hosts will be ballanced the same way until peak rate will hit. after peak hit both interfaces in the bundle are used for transmit and receiving.

    I suppose that behaviour for the most part caused by switch/stack ports config, since ng_fec(4) has only 1 setting: forwarding method (set_mode_mac/set_mode_inet). May be it would be great to have some description of switch/stack ports configuration in the ng_fec(4) man page.

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  • Next message: John-Mark Gurney: "Re: Aggregate network interfaces"