"BOND,JAMES (HP-USA,ex1)" wrote:

> The problem you attached is a known-problem with a version of Cisco
> firmware.  It takes a trace to prove it... but you can get a clue from
> the NMLG files...
>
> The problem is in the HP-e3K's strict adherence to the precedence bit
> settings and the rules for changing precedence as per RFC 793.  You
> are allowed to make a change in precedence (greater than current value)
> in the original SYN/SYN-ACK/ACK connection setup "hand shake".  If you
> make a change to precedence any time after the initial connection
> setup then RFC 793 says RESET the connection.  CISCO is violating the
> RFC 793 in that it is changing the precedence to the value of "111 -
> Network Control" after the connection is established.  RFC 793 says to
> reset the connection.
>
> To verify this on the HP-e3K, you can :switchnmlog, then duplicate the
> problem and then :switchnmlog.  Read the nmlg file with NMDUMP and you
> will see a "precedence" error.
>
> Since the "beginning" and "RFC 793", apparently the "industry" has
> departed from the strict adhearance of the precedence rules documented
> in RFC 793 and most TCP/IPs just ignore any value for precedence as is
> the case with the HP-UX TCP/IP as an example.
>
> WTEC is looking into support of RFC 2873 - see: SR 8606286850 where
> this behavior would be permitted and the HP-e3K's strict adherence to
> RFC 793 precedence handling would be relaxed to meet the defacto
> "industry" standard of ignoring precedence.
>
> P.S. For a further discussion of precedence one of several references
> is Douglas E. Comer's Internetworking with TCP/IP Principles,
> Protocols, and Architectures... Vol-1.  7.7.2 Datagram Type Of
> Service...
>
> I hope this helps.
>
> Regards,

bond....james bond

--
Donna Garverick     Sr. System Programmer
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