On 24.10.21 21:59, Nick Hilliard wrote:
Eliot Lear wrote on 24/10/2021 18:17:On 24.10.21 17:36, Nick Hilliard wrote:The issue is a good deal deeper than just debugging. As long as there's an option to specify a variable length parameter without being able to specify the length in the protocol, then the protocol is fundamentally ambiguous and its interpretation is entirely context dependent.You mean, like a subnet mask?There's no direct analog here.
Of course there is. You cannot distinguish routing from host without looking at external control channels, such as a routing or configuration protocol; and you certainly cannot determine the subnet mask of a network without that external information, since it's not in the packet. And it's not even in the control plane if the route has been aggregated. Does that make the information "ambiguous"? The point is that the subnet mask of a network is part of a context that you discussed, and you might not have it.
Note- I am not taking a position about CSIDs, but I think this line of argument is on the wrong track.
Eliot
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