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Date:      Fri, 09 Mar 2012 08:52:42 -0500
From:      Jon Radel <jon@radel.com>
To:        bo wang <wowopla@gmail.com>
Cc:        questions@freebsd.org
Subject:   Re: Fwd: Some questions about Link Aggregation and Failover
Message-ID:  <4F5A0B2A.2000706@radel.com>
In-Reply-To: <4F59C8A0.9030405@my.gd>
References:  <CAAy2jpE=KNm9YtVPznBUb3tzWJ6Nf92YCS-xmT0dBGfEmJ8qjw@mail.gmail.com> <CAAy2jpEQ5RBQbk-qMo5VMuOok3jZ=WxCDRowwvD8mmDqUoGOww@mail.gmail.com> <4F5818A4.20509@hdk5.net> <CAAy2jpEvRgo5mPueG1BYjVHCQjkupmoEi9pR+fFFKNYG2tAbpg@mail.gmail.com> <CAAy2jpF3=qXgSzYVonoqQN4JisyqrKoUgS=DH6UKtHa37beY-A@mail.gmail.com> <CAAy2jpHXvCGS+hvqreJuCrSGdaO4YsZTJsiN-UBUKsMWPWx=Jw@mail.gmail.com> <4F58752E.2010405@my.gd> <CAAy2jpHdU0WN9Vr_cG1hzDRc0uBE4oRJ7YJWjhL04Bj+K_F1Vw@mail.gmail.com> <4F59C8A0.9030405@my.gd>

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On 3/9/12 4:08 AM, Damien Fleuriot wrote:
>
> Well that's exactly what I'm trying to show you.
>
>
>
> Link aggregation will *NOT* allow you to get 200mbs between 2 servers b=
y
> sending data over the 2 cables.
>
> As per the example I pasted below, link aggregation uses a load
> balancing algorithm to share the traffic across several links.
>
> It will *NOT* use *BOTH* links for a single "source ip - destination ip=
"
> pair.

All of which is explained at least twice in the document the OP claims=20
to have used

    http://www.freebsd.org/doc/en/books/handbook/network-aggregation.html=


once in the section on LACP:

"LACP balances outgoing traffic across the active ports based on hashed=20
protocol header information and accepts incoming traffic from any active =

port. The hash includes the Ethernet source and destination address,=20
and, if available, the VLAN tag, and the IPv4/IPv6 source and=20
destination address."

and once in Example 32-1, which is presumably being used as the cookbook =

for this project:

"Since frame ordering is mandatory on Ethernet links then any traffic=20
between two stations always flows over the same physical link limiting=20
the maximum speed to that of one interface. The transmit algorithm=20
attempts to use as much information as it can to distinguish different=20
traffic flows and balance across the available interfaces."

Has use of Gig ethernet been considered?

--=20
--Jon Radel
jon@radel.com


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