Re: [Pce] PCE port number

[Vishwas Manral <vishwas.ietf at gmail.com>]

Hi Julien,

Thanks for your comment. I agree with it. I am actually concerned
about the below statement which in my view means we have to use the
same source and destination port:

"All PCEP messages MUST be sent using the registered TCP port for the
source and destination TCP port.”

I believe the same may not be achieveable in a lot of merchant OS's in
some of the cases. Can the implementors of the same please confirm if
they are using the source and destination port as the PCE port?

Thanks,
Vishwas

On Thu, Sep 10, 2009 at 1:57 AM,  <julien.meuric at orange-ftgroup.com> wrote:
> Hi Vishwas.
>
> Interesting comment. We must admit the wording is a bit ambiguous.
>
> RFC 5440 says: "The system listens to the PCEP-registered TCP port" and "Upon receiving a TCP connection on the PCEP-registered TCP port"; I do not see any behavior description for the source TCP port (good thing!).
> My guess is that there is no intend to put constraints on the TCP initiator port. I would interpret the sentence you mention as "using the registered TCP port on the PCE side, i.e. for the source TCP port for PCE to PCC messages and for destination TCP port for PCC to PCE messages"... A little cumbersome, I agree.
>
> Authors of RFC 5440, would there be an actual intend to specify otherwise? Implementers, any other interpretation?
>
> Thanks,
>
> Julien
>
>
> -----Original Message-----
> From: pce-bounces at ietf.org [mailto:pce-bounces at ietf.org] On Behalf Of Vishwas Manral
>
> Hi,
>
> I looked at the following in the spec:
>
> “Transport Protocol
>
>  PCEP operates over TCP using a registered TCP port (4189).  This
>  allows the requirements of reliable messaging and flow control to be
>  met without further protocol work.  All PCEP messages MUST be sent
>  using the registered TCP port for the source and destination TCP
>  port.”
>
> This has been worrying me a bit. Unlike other protocols like BGP or LDP
>
> In BGP it states clearly:
>
>   A BGP implementation MUST connect to and listen on TCP port 179 for
>   incoming connections in addition to trying to connect to peers.
>
> and
>
>   BGP's destination port SHOULD be port 179, as defined by IANA.
>
> Why do we have this restriction on source port? It is becoming a
> challenging task
> in merchant OS.
>
> Thanks,
> Vishwas
> Vishwas
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