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Reason behind non-compulsory extension handling exception?

  • From: gardo@vnet.ibm.com
  • Date: Tue, 2 Apr 96 08:58:06 EST

> 5.3  Extensions Part
> [...]
>  If the Compulsory bit is clear then the
>    extension can be safely ignored; however, if an ignored extension is
>    in a "request" then it MUST be returned, unchanged, in the
>    corresponding "reply" packet type.


> 5.2.2 NHRP Next Hop Resolution Reply
> [...]
>   Any extensions present in the Next Hop Resolution Request packet MUST
>    be present in the NHRP Next Hop Resolution Reply packet, except for
>    the case of unrecognized non-Compulsory extensions.
Why do we have this exception here, and why does this exception only
apply to one reply type (the Resolution Reply)?

-- Russell