The text describing client validation of OPTION_S46_PORTPARAMS in the
second-last paragraph of Section 4.5 currently reads as follows:
When receiving the Port Parameters option with an explicit PSID, the
client MUST use this explicit PSID in configuring its MAP interface.
If the conveyed IPv4 address is not 32 bit-long. The formula for
this check is "prefix4-len + ea-len = 32" and serves to ensure
that the explicit PSID is only applied to configurations with a
completely formed IPv4 address.
I don't think the sentence fragment "If the conveyed IPv4 address ..."
should be there. In the subsequent sentence, I believe the check must be:
"prefix4-len + ea-len > 32"
Otherwise no port values are conveyed by the option. See Section 5.2 of
the MAP document, particularly Figure 6 and associated text.
I would also add "shared and" before "completely formed" at the end of
the paragraph.
Tom Taylor
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