Re: Cannot get bonding mode 4 (lacp) to work

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linux lacp works fine. the best way to troubleshoot the problem is to
capture the lacp packets and check what the protocol states are
(ethereal has excellent support for decoding lacp packets.)

On Thu, Apr 22, 2010 at 8:28 PM, AndrewL733 <AndrewL733@xxxxxxx> wrote:
> Hello,
> I am hoping that somebody here can help me troubleshoot getting "bonding
> mode 4" (LACP, dynamic link aggregation, 802.3ad) working, or at least point
> me to where I can get debugging information to solve the problem myself. I'm
> not seeing anything particularly helpful in dmesg or in the syslog.
> Here is my situation. I have an extremely fast network storage system
> capable of reading and writing over 4 GB/sec.  Obviously, I can saturate one
> 10 GbE Network adapter.  So, I am experimenting with ways to aggregate the
> bandwidth of 2 or more 10 GbE ports to one switch. Each of my clients can
> use about 320 MB/sec in each direction (simultaneous reading and writing) or
> 640 MB/sec just reading,  and I want to connect at least 4 clients to the
> switch.
> I am testing both Fujitsu and Blade Network switches with 24 x 10 GbE ports.
>  On the server end, I have multiple Myricom 10 GbE cards, as well as full
> speed dual-port Myricom cards (not the slower failover cards). When I
> configure 2 ports on either switch for LACP, and then set up Linux to use
> bonding mode 4, I cannot pass any data from the Linux server to the switch.
> I cannot ping the switch or anything attached to it.  In the case of the
> Blade Networks switch, the switch logs tell me that the Linux end does not
> seem to support LACP.
> I do not think the problem is with bonding itself. If I set up Linux bonding
> with mode=1 (round robin) or mode=6 (alb) -- and if I just leave the 10 GbE
> switches unconfigured -- network traffic gets distributed to both physical
> ports on the server.  By the way, I am running the
> "vanilla" kernel on a Mandriva 2010 distribution. I am setting up bonding as
> follows:
> A) for mode 4
> modprobe bonding  mode=4  miimon=100
> ifenslave bond0 eth0
> ifenslave bond0 eth1
> ifconfig bond0 {IP Address} up
> B)  for other modes, substituting mode=1 or mode=6
> I have also tried bridging the two or more 10 GbE ports (creating a br0
> device).  Bridging works, as does bonding mode 1 and mode 6.  The downside
> of bridging, however, is that I must create multiple vlans on the switch to
> force workstations to use one physical connection to the server or the
> other.  Mode 1 gives me very high throughput, but is unreliable for steady
> realtime data flow (this is for a very high bandwidth video application).
>  Mode 6 seems like it might be promising, but I believe my best bet will be
> mode 4.  However, I cannot get mode 4 to work with either switch.
> Can somebody give me some hints here?  What are the best logs to look at to
> see what's going on to troubleshoot?  Is Linux not able to talk to a switch
> configured for LACP?  I'm fairly sure I have been successful doing this
> before with 1 Gig ports, but this is my first time trying with 10 Gig ports.
>  Help and advice would be appreciated.  Thank you in advance.
> Andrew
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