RE: Multiple SCTP associations

Sergey,

-----Original Message-----
From: [email protected] [mailto:[email protected]]On Behalf Of
Sergey Mikhailov
Sent: Tuesday, January 10, 2006 11:39 AM
To: SIGTRAN
Subject: [Sigtran] Multiple SCTP associations


Hi,

It seems that multiple SCTP associations established between the same two
signaling processes are not [explicitly] prohibited.

1.
Is it legal for a signaling process to establish more than one SCTP
association to the same AS/SG where these multiple associations are served
by different signaling processes?
[TOLGA]Yes, this is how host redundancy is achieved (I assume you talk about
M3UA/SUA). There are multiple ASPs serving an AS, and multiple SGPs in a SG,
and there is a SCTP association between each SGP/ASP pair -well, obviously
it is not mandatory-.

2.
Is it legal for a signaling process to establish more than one SCTP
association to the same signaling process at the remote side?

(I feel that the 2nd case may be reasonable only when the remote side does
not support multi-homed SCTP endpoints.)
[TOLGA]Multiple SCTP assocaitions between two etities will have problems
with ASP state machine if you follow it strictly considering the state
transitions associated with events from SCTP. This is easy to overcome with
a some reasonable reinterpretation. OTOH, multiple SCTP associations won't
be a replacement for SCTP multihoming support because SCTP multihoming
provided network/NIC redundancy without loss/missequencing of messages.

Regards,
Sergey Mikhailov.