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Issues
One comment that Active/Active startup should be supported and it should be “easy”.
“All that is required is to define a third value for "instant start", which each side sends *and* expects to receive.”
This makes a “dual stack” implementation harder, because there is not a specific point where the legacy TCP stack can transition to the TCP/MPA/DDP stack.
Authors believe that not supporting this makes for easier implementations that avoid several difficult “races”.
PPT Version