Re: [OPENETLAB] Question: Oplets and Accelar Queue Mgt./Routing

["Tal Lavian" <tlavian@nortelnetworks.com>]

The Accelar design is to support RED. However, they had some
problem in the implementation, and this does not work properly. So the
solution is they took it out from all the user documentation, and they
tried to hide it from the software point of view. It looks that in
release 3.2 they will fix the problem and it would be part of the system.

Tal

At 04:39 PM 9/18/2000 -0400, Sawant, Vivek wrote:
> Hi All,
>
> I am playing with an idea of influencing Accelar Forwarding from
> Oplets.
> I am looking at an algorithm which is an extension to RED. I wonder if
> I
> can implement it as an Oplet and combine it with Accelar IPfilter
> setting to influence Accelar Packet forwarding.
>
> My initial investigation suggests that this is not possible. Here 
> is
> why. This algorithm, like any other queue management algorithm,
> includes
> the just arrived packet in a computation to decide if the packet
> should
> be dropped or queued. If this computation happens in an Oplet, it 
> is
> essentially happening outside the Accelar forwarding path. Given
> current
> Accelar filter actions, one can either choose to drop or forward a
> packet (besides getting a copy of it, etc.) One cannot pull a 
> packet
> out, do computations and then give it back to Accelar forwarding
> engine.
> (I know, it will radically slow the engine down.) So, such a queue
> management algo has to be part of the Accelar forwarding mechanism.
>
> Is my inference correct or is it still possible to implement such a
> scheme through Oplets? Does Accelar support RED queues?
>
> Thanks.
>
> _vivek

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Tal Lavian          http://www.openetlab.org

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