Multihoming: use of two paths

Hi Brian,
my name is Marco Troiano and I am a TLC engineer, working on a Italian Telecommunication company. I work on testing Sigtran in these days and I saw that some SCTP implementations use two paths for data traffic.
I mean that, in normal conditions, one node send traffic using both primary and secondary path in the same SCTP association. Is this behaviour normal for you? Looking at RFC 4960, I see:

An SCTP endpoint is considered multi-homed if there are more than one
   transport address that can be used as a destination address to reach
   that endpoint.

   Moreover, the ULP of an endpoint shall select one of the multiple
   destination addresses of a multi-homed peer endpoint as the primary
   path (see Section 5.1.2<http://tools.ietf.org/html/rfc4960#section-5.1.2> and Section 10.1<http://tools.ietf.org/html/rfc4960#section-10.1> for details).

   By default, an endpoint SHOULD always transmit to the primary path,
   unless the SCTP user explicitly specifies the destination transport
   address (and possibly source transport address) to use.

I understood that it is not mandatory using primary path but it is not mentioned to use two paths.

Thanks in advance,
Marco Troiano


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