[Idr] Revised text on how to construct the AS path info

Hi, folks:

Attached is the revised text on how to construct the AS path information.

Please comment if you see any issue.

> Will clarify on how to re-construct the as-path. Will send out the 
> text when it is ready.

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The exact AS path information can be constructed by taking as many AS
numbers and path segments as necessary from the leading part of the
AS_PATH attribute, and then prepending them to the NEW_AS_PATH
attribute so that the AS path information has an identical number of
AS numbers as the AS_PATH attribute. The number of AS numbers is
calculated using the method specified in Sect. 9.1.2.2 [BGP-4] and
[RFC3065] for route selection. Note that an AS_CONFED_SEQUENCE or
AS_CONFED_SET path segment is counted as zero, and SHALL be prepended
when it is adjacent to another path segment that is prepended.
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-- Enke

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