[ovs-discuss] Multipath routing

[Ben Pfaff]

Did you read nicira-ext.h?

On Mon, Mar 19, 2012 at 03:08:37PM -0700, Masoud Moshref Javadi wrote:
> I just want an example that fills the action part in the following rule:
> ovs-ofctl add-flow br0 nw_src=10.0.0.1/32,nw_dst=10.0.0.1/32,action=?
> 
> The manual page says:
> 
>    multipath(fields, basis, algorithm, n_links, arg, dst[start..end])
> 
>    Hashes fields using basis as a universal hash parameter, then the
>    applies multipath link selection algorithm (with parameter arg) to
>    choose one of n_links output links numbered 0 through n_links minus
>    1, and stores the link into dst[start..end], which must be an NXM
>    field as described above.
> 
>    Currently, fields must be either eth_src or symmetric_l4 and
>    algorithm must be one of modulo_n, hash_threshold, hrw, and
>    iter_hash. Only the iter_hash algorithm uses arg.
> 
> "one of n_links output links numbered 0 through n_links minus 1",
> which links? Does it mean all ports? If yes, then what if it is the
> wrong port that does not lead to the destination? If the algorithm
> keeps track of the correct links that will lead to the destination
> what is the use of this parameter?
> What is dst[start..end]? would you give an example?
> what is *symmetric_l4?* there is no definition for it in this manual?
> 
> On 3/19/2012 2:56 PM, Ben Pfaff wrote:
> >On Sat, Mar 17, 2012 at 10:41:05AM -0700, Masoud Moshref Javadi wrote:
> >>Would anyone give an example for a multipath action in openvswitch? How
> >>does the rule look like in ovs-ofctl command? What are the per-requisites?
> >It's all documented.  Which part is troublesomee?
> >
> >Thanks,
> >
> >Ben.
>