[c-nsp] ASR9k Bundle QoS in 6.0.1

[Adam Vitkovsky]

> Mark Tinka
> Sent: Friday, May 13, 2016 1:13 AM
> On 12/May/16 19:58, Saku Ytti wrote:
>
> > I've not used it, curious to hear why it does not work? Of course if
> > you don't have any entropy, then there is nothing you can do, if there
> > is just single fat flow which needs more than single member has
> > capacity, no flows, no flow balancing. What should work, is if in
> > addition to fat flows you have others.
>
>
> Per-packet mode was the only solution, as single flows on LAG's lead to two
> problems:
>
>   * The main reason for the LAG (increase port bandwidth cheaply) is
>     negated.
>
>   * Policers programmed in equal distribution across participating ports
>     or PFE's create a bottleneck if a single flow running across a
>     specific interface triggers the calculated carve-up factor for a
>     specific member link in the LAG.
>
> I think that there is a bad disconnect by the vendors on the relationship
> between LAG's and the policers applied to them.

But how would you like it to be solved please?
Cisco attempted to solve the second problem in a very clumsy way, but I can't think of a pretty solution either and thus would like to see if other folks have any bright ideas that we could take to vendors.

adam









        Adam Vitkovsky
        IP Engineer

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