Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed

Tony Li <tony1athome@gmail.com> Wed, 19 February 2020 09:30 UTC

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From: Tony Li <tony1athome@gmail.com>
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Date: Wed, 19 Feb 2020 20:30:04 +1100
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Cc: tony.li@tony.li, Les Ginsberg <ginsberg@cisco.com>, "lsr@ietf.org" <lsr@ietf.org>
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To: Peter Psenak <ppsenak@cisco.com>
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Subject: Re: [Lsr] Flow Control Discussion for IS-IS Flooding Speed
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Peter,

> above is nowhere close to what the reality is, especially in the distributed system. In such system, packets traverses via multiple queues on both LC and RP and application like IGP has no visibility to these queues.


As you may recall, I was lead software architect for NCS 6000.  I am well aware that a distributed implementation is more complex.  However, Les is insistent that we discuss specifics and that is most easily done with a simpler model.

The applications can get visibility into the queues through the same fundamental mechanism: poll the various NPUs on the data path and report to the application CPU.  

Tony