[ovirt-users] 答复: bond mode balance-alb

[Jorick Astrego]

On 12/29/2014 12:56 AM, Dan Kenigsberg wrote:
> On Fri, Dec 26, 2014 at 12:39:45PM -0600, Blaster wrote:
>> On 12/23/2014 2:55 AM, Dan Kenigsberg wrote:
>>> Bug 1094842 - Bonding modes 0, 5 and 6 should be avoided for VM networks
>>> https://bugzilla.redhat.com/show_bug.cgi?id=1094842#c0
>> Dan,
>>
>> What is bad about these modes that oVirt can't use them?
> I can only quote jpirko's workds from the link above:
>
>     Do not use tlb or alb in bridge, never! It does not work, that's it. The reason
>     is it mangles source macs in xmit frames and arps. When it is possible, just
>     use mode 4 (lacp). That should be always possible because all enterprise
>     switches support that. Generally, for 99% of use cases, you *should* use mode
>     4. There is no reason to use other modes.
>
This switch is more of an office switch and only supports part of the
802.3ad standard:


            PowerConnect* *2824

    Scalable from small workgroups to dense access solutions, the 2824
    offers 24-port flexibility plus two combo small‑form‑factor
    pluggable (SFP) ports for connecting the switch to other networking
    equipment located beyond the 100 m distance limitations of copper
    cabling.

    Industry-standard link aggregation adhering to IEEE 802.3ad
    standards (static support only, LACP not supported)


So the only way to have some kind of bonding without buying more
expensive switches, is using balance-rr (mode=0), balance-xor (mode=2)
or broadcast (modes=3).
>> I just tested mode 4, and the LACP with Fedora 20 appears to not be
>> compatible with the LAG mode on my Dell 2824.
>>
>> Would there be any issues with bringing two NICS into the VM and doing
>> balance-alb at the guest level?
>>
Kind regards,

Jorick Astrego



Met vriendelijke groet, With kind regards,

Jorick Astrego

Netbulae Virtualization Experts 

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