[Sis-ams] no handshaking when RAMS Gateway initially comes up

Scott Burleigh Scott.Burleigh at jpl.nasa.gov
Wed Jul 23 16:46:53 EDT 2008


Donahue, Pat wrote:
> When a RAMS Gateway initially comes up, currently there is no type of 
> handshaking in order to get it up to date with the pre-existing 
> Subscriptions (petitions) for peer Gateways.  Scott thinks this 
> probably needs to be addressed in the Spec we are working on.
>  
> By the way, when a Node comes up (the parallel), there is the 
> I_AM_HERE / DECLARATION (Feb 2007 Spec terminology) handshaking to get 
> the initializing Node up to date on Subscription requests from other 
> Nodes.
Pat, I have finally had some time to think hard about this, and on 
reviewing my old emails I discover that this initial handshaking 
actually is in the current spec after all.  Look at section 4.4.6.3: 
when a gateway receives a petition for the pseudo-subject identifying 
some continuum (as is the case when a new remote gateway starts up and 
announces itself -- 4.4.2.1.4), it must send to that petitioning gateway 
an assertion of each of its own petitions whose assertion set includes 
that gateway.  Non-obvious, I agree, but then very little about RAMS is 
obvious.

Scott
-------------- next part --------------
An HTML attachment was scrubbed...
URL: http://mailman.ccsds.org/pipermail/sis-ams/attachments/20080723/3edc49aa/attachment.html


More information about the Sis-ams mailing list