[P4-dev] P4-16, D2. in Open Issues

Thomas Edwards Thomas.Edwards at fox.com
Wed May 3 13:54:26 EDT 2017

I was considering recently whether PTP sync message timestamps could be used to change forwarding behavior of other flows.

In a “traditional” SDN model, the PTP sync messages could be sent to the controller to initiate re-configuration of flows on the switch, but the latency would be significant – it might be faster if this communication could stay on the data plane.


Thomas Edwards
VP Engineering & Development
FOX Networks Engineering and Operations
thomas.edwards at fox.com
Phone: +1.310.369.6696
10201 West Pico Blvd.
Los Angeles, CA 90035

From: P4-dev <p4-dev-bounces at lists.p4.org> on behalf of Mihai Budiu <mbudiu at vmware.com>
Date: Tuesday, May 2, 2017 at 6:35 PM
To: "hemant at mnkcg.com" <hemant at mnkcg.com>, 'p4-dev' <p4-dev at lists.p4.org>
Subject: Re: [P4-dev] P4-16, D2. in Open Issues

P4-16 has no operations to modify tables from the data-plane, and neither does P4-14.

A specific P4-16 architecture could provide an extern function for this purpose, but the P4 standard architecture draft under development has no such function.

Registers can be used for bi-directional communication between the control-plane and the data-plane; they will probably be part of the standard architecture.


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