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%2BfFFKNYG2tAbpg@mail.gmail.com> <CAAy2jpF3=qXgSzYVonoqQN4JisyqrKoUgS=DH6UKtHa37beY-A@mail.gmail.com> <CAAy2jpHXvCGS%2BhvqreJuCrSGdaO4YsZTJsiN-UBUKsMWPWx=Jw@mail.gmail.com> <4F58752E.2010405@my.gd> <CAAy2jpHdU0WN9Vr_cG1hzDRc0uBE4oRJ7YJWjhL04Bj%2BK_F1Vw@mail.gmail.com> <4F59C8A0.9030405@my.gd>
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This is a cryptographically signed message in MIME format. --------------ms000300050704070105030901 Content-Type: text/plain; charset=ISO-8859-1; format=flowed Content-Transfer-Encoding: quoted-printable 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 --------------ms000300050704070105030901--
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