RE: etherchannel on 5.2.1 - possible?

From: Will Saxon (WillS_at_housing.ufl.edu)
Date: 04/19/04

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    Date: Mon, 19 Apr 2004 10:06:45 -0400
To: "J.D. Bronson" <jbronson@wixb.com>, <freebsd-performance@freebsd.org>

    > -----Original Message-----
    > From: J.D. Bronson [mailto:jbronson@wixb.com]
    > Sent: Monday, April 19, 2004 9:46 AM
    > To: freebsd-performance@freebsd.org
    > Cc: freebsd-questions@freebsd.org
    > Subject: etherchannel on 5.2.1 - possible?
    >
    >
    > I am looking for performance. Not fail-over..
    >
    > Does anyone have this working with either
    > intel or broadcom nics?
    >
    > Anyone have any good site that talks about what is needed to
    > make this work
    > as well? - I do have a Cisco switch and it fully supports this.
    >
    > I need a little advice on setting this up...

    I have used the ng_fec netgraph module with both broadcom 5703X and
    HP NC7170 nics (uses em driver).

    This is how to set it up:

    First you have to have the ng_fec module loaded.

    Then,

    # ngctl mkpeer fec dummy fec
    # ngctl msg fec0: add_iface '"bge0"'
    # ngctl msg fec0: add_iface '"bge1"'

    Obviously replace bge with em or whatever other driver you are using.
    ng_fec supports up to 4 links.

    At this point, you will have a fec0 interface that you can
    manipulate normally with ifconfig. I have noticed that sometimes
    I have to bring the interface up and down a couple of times to get
    it to start passing traffic. Whenever you 'ifconfig up' or assign an
    address to fec0 it resets the bundle.

    One thing that is annoying is that ng_fec doesn't work with vlans. There
    is an ng_vlan module that was recently released, but ng_fec doesn't work
    with it because it isn't quite like other netgraph modules.

    Almost all of my freebsd machines use vlans, so I am not making heavy
    use of ng_fec. We aren't pushing enough data to make it really necessary
    anyway.

    There is also ng_one2many which does implement failover and channel
    bonding but not using the etherchannel technique. I think it uses
    round robin.

    -Will
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