RE: [Sigtran] Client/Server Operation in M3UA IPSP

Peter,

My understanding is also similar to what you describe below. Actually,
considering the peer-to-peer nature of IPSP (which holds true only for
SE-mode), theoretically it may be not very correct to speak of
clients/servers.

The issue on SCTP level is another one. In fact, as far as I can recall, it
shouldn't be a problem even for SCTP, if both sides are willing to establish
the association. Regardless of that, this is separate from M3UA level.

    Thanks,
    Tolga

> -----Original Message-----
> From: sigtran-bounces@ietf.org [mailto:sigtran-bounces@ietf.org]On
> Behalf Of Peter Woodhouse
> Sent: Friday, September 23, 2005 9:28 AM
> To: sigtran@ietf.org
> Subject: [Sigtran] Client/Server Operation in M3UA IPSP
>
>
>
> Hi All,
>
> After the recent plugtest, it was suggested that this issue should be
> brought up here just for confirmation. So here goes.
>
> In IPSP mode of M3UA, should there be any difference between how the
> client side and the server side operate?
> For example, is it valid for the server side to send ASPUP?
> Also, should the client send NTFY messages?
>
> The way we interpret the RFC is that there is zero difference between
> client and server at M3UA level. The only difference is that the client
> side brings up the SCTP association.
>
> Looking back through previous drafts of M3UA, section 1.4.8 of
> draft-ietf-sigtran-m3ua-06.txt did say "In the case of IPSP to IPSP
> communication, the peer endpoints using M3UA SHOULD be configured so
> that one always takes on the role of client and the other the role of
> server for initiating SCTP associations and M3UA messaging."
> However the M3UA part was removed for draft 07 onwards.
>
> In fact, I don't think Double Exchange would work if you dissallow the
> sending of ASPUP from the server side.
>
> Comments?
>
> Peter
>
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