Vinay, some switches have support for multi-chassis link aggregation (often 
called MLAG). For MLAG-capable switches, you should be able to use any 
LACP-based bonding mechanism across multiple **correctly configured** switches. 
However, in the absence of MLAG support, LACP-based bonding types cannot be 
used across multiple upstream switches.

Does that help at all?


On Dec 11, 2014, at 10:44 AM, Vinay Bannai <[email protected]> wrote:

> Reading through the 'INTERNALS" document in vswitchd directory, I saw a 
> statement under "Active Backup Bonding" that I would like to get clarified. 
> 
> Active Backup bonds send all traffic out one "active" slave until that
> slave becomes unavailable.  Since they are significantly less
> complicated than SLB bonds, they are preferred when LACP is not an
> option.  Additionally, they are the only bond mode which supports
> attaching each slave to a different upstream switch.
> 
> The last statement implies that only Active Backup supports connecting to 
> different upstream switches. This seems to be incorrect as our experience 
> shows that we can connect to the different upstream switches for both "tlb" 
> and "slb" modes using LACP. If someone can clarify, I am happy to update the 
> section. 
> 
> -- 
> Vinay Bannai
> Email: [email protected]
> Google Voice: 415 938 7576
> _______________________________________________
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