Re: Need ANSWER 4 these QUERIES !!
"Brian F. G. Bidulock" <[email protected]>
| Newsgroups | gmane.ietf.sigtran |
|---|---|
| Organization | http://www.openss7.org/ |
| Message-ID | <[email protected]> |
Mahantesh,
Mahantesh wrote: (Thu, 16 Nov 2006 17:56:25)
>
> Hi Brain,
>
>
>
> Few more queries, and need ANSWERS
>
>
>
> 1. In M3UA msg the version parameter can have value 0 or 1, Is
> version-1 has BACKWARD copatibility with vesion-0?
No. RFC 4666 was not written with backward compatibility to RFC 3332 in mind.
RFC 4666 OBSOLETES RFC 3332. Therefore a version parameter with a value of 0
is following an OBSOLETE PROPOSED STANDARD. If you really want to support an
obsolete proposed standard, the differences are perhaps not too drastic in
most cases, and I believe it is not too difficult to place the necessary
conditionals in the code to accomodate both.
> 2. In lo adshare mo de, if a mantion [2+1] and one of the ACTIVE ASP
> goes down then the INACTIVE ASP should be informed to get into
> ACTIVE mode or an NOTIFY/ERROR msg should be sent? If ERROR, what
> the 1 in [2+1] is doing?
If the minimum number of ASPs for the AS is configured as 2 at the SG, and
one of the two goes inactive, the SG must send Notify("Insufficient ASPs
active in AS"). If the SG follows the principles of
http://www.ietf.org/internet-drafts/draft-bidulock-sigtran-corid-04.txt
it will wait for a time before diverting traffic from the inactivating or
failed ASP to the remaining ASP, giving the notified (or recovering) ASP
sufficient time to (re)activate and accept the traffic marked for diversion.
If one of the ASPs fail (i.e. the associations are lost to the SG), the SG
will notify the remaining active and inactive ASP both with
Notify("Insufficient ASPs active in AS") as well as Notify("ASP Failure") with
the ASP Id of the failing ASP.
Neither notification, however, compels the inactive ASP to become active. It
is up to the ASPs to decide amoungst themselves what the best course of action
is. (The only notification message that compels an ASP is Notify("Alternate
ASP Active in AS").)
--brian
--
Brian F. G. Bidulock
[email protected]
http://www.openss7.org/