Re: Simultaneous support single exchange and double exchange in M3UA

Kevin,

SE support is mandatory.  DE support is optional.  Therefore, when an
implementation supports DE it must also support SE.

Some implementations might only support one model at a time for a
given AS/ASP, but that is a (minor) limitiation of that implementation.

There is no need for negotiation: all implementations supporting IPSP
MUST support SE: so just use that.

Nevertheless, when an IPSP sends an ASP-UP message and receives an
ASP-UP message in response, or sends an ASP-ACTIVE message and receives
an ASP-ACTIVE message in response, it can determine that the peer
is using DE mode and proceed accordingly.

It can also determine DE mode from REGREQ messages in a similar manner
when registration is used.

--brian

Kevin Peterson wrote:                     (Sun, 18 Aug 2013 06:20:54)
> Hi, 
> 
> Can one implementation support single exchange and double exchange
> models of IPSP at the same time ? Or does it have to be configured and
> only one of the models can be active at a time ? Is there any M3UA
> procedure which can help in dynamic negotiation of SE/DE models.
> 

-- 
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/