H.248 Annex M Debate

Tom-PT Taylor taylor at NORTELNETWORKS.COM
Wed Dec 20 09:17:19 EST 2000


Hi All,
I am a new entrant to this mailing list and appreciate the time and effort
you spend on it.
I am in a slight quandary.
I am writing three agents (with separate functionalities) for a network
element that is an H323 gatekeeper.
Two of these agents are based on the mandatory MIBs for an H.323 Gatekeeper
(the RAS-MIB and the H323-GATEKEEPER-MIB, B.2 and B.4 respectively,as given
in Annex B of the ITU-T H.341 Recommendation *Multimedia Management
Information Base*)
These MIBs use ifIndex from Interfaces MIB (RFC 1573, 2233).

> I have queried regarding the problem with Mr.Keith McCloghrie of Cisco
> Systems who is one of the authors of the RFCs on this (RFC1573,2233) and
> he appears to be of the opinion that the definitions are probably broken.
I'll describe the problem below.

The description of the following notifications seems to be broken.They use
ifIndex as an object of the notification, while
it is specified in the RFCs mentioned above that the semantics of an ifIndex
value is to identify a network interface, not a network element such as the
Gatekeeper, as the Description of these notifications shows.
I wish to ascertain the purpose of using ifIndex in these MIBs and what it
stands for from among the following
** Multiple Gatekeepers within managed system ?
** Multiple physical network interfaces of s single gatekeeper  ?
Further, RFC 2578 specifies that a single value of a MIB "Counter has (in
general) no information content" (see section 7.1.6).  Therefore, it is
contrary to the SMI to specifythat "All MIB counters have gone to zero".

Please clarify regarding the same.
Any and all comments will be appreciated.
Best Regards,
--Shshank


The notifications are given as follows:
#1
****************************************************************************
*****
Name:   h323GatekeeperStart
Type:   NOTIFICATION-TYPE
OID:    0.0.8.341.1.1.6.6.0.1
Full path:
oid_ccitt(0).oid_recommendation(0).oid_h(8).oid_h341(341).mmRoot(1).mmH323Ro
ot(1).h323Gatekeeper(6).oid_
0_0_8_341_1_1_6_6(6).h323GatekeeperNotifications(0).h323GatekeeperStart(1)
Module: H323-GATEKEEPER-MIB

Parent: h323GatekeeperNotifications
Next sibling:   h323GatekeeperGoingDown

Status: current
Objects:        1: ifIndex

Description:    Signifies that the gatekeeper has started. All MIB counters
                                have gone to zero.
****************************************************************************
*****
#2
****************************************************************************
*****
Name:   h323GatekeeperGoingDown
Type:   NOTIFICATION-TYPE
OID:    0.0.8.341.1.1.6.6.0.2
Full path:
oid_ccitt(0).oid_recommendation(0).oid_h(8).oid_h341(341).mmRoot(1).mmH323Ro
ot(1).h323Gatekeeper(6).oid_
0_0_8_341_1_1_6_6(6).h323GatekeeperNotifications(0).h323GatekeeperGoingDown(
2)
Module: H323-GATEKEEPER-MIB

Parent: h323GatekeeperNotifications
Prev sibling:   h323GatekeeperStart
Next sibling:   h323GatekeeperError

Status: current
Objects:        1: ifIndex

Description:            Signifies that the gatekeeper is about to go down
****************************************************************************
*****
#3
****************************************************************************
*****
Name:   h323GatekeeperError
Type:   NOTIFICATION-TYPE
OID:    0.0.8.341.1.1.6.6.0.3
Full path:
oid_ccitt(0).oid_recommendation(0).oid_h(8).oid_h341(341).mmRoot(1).mmH323Ro
ot(1).h323Gatekeeper(6).oid_
0_0_8_341_1_1_6_6(6).h323GatekeeperNotifications(0).h323GatekeeperError(3)
Module: H323-GATEKEEPER-MIB

Parent: h323GatekeeperNotifications
Prev sibling:   h323GatekeeperGoingDown

Status: current
Objects:        1: ifIndex
        2: h323GatekeeperStatisticsLastErrorEventTime
        3: h323GatekeeperStatisticsLastErrorSeverity
        4: h323GatekeeperStatisticsLastErrorProbableCause

Description:            Signifies that an error has occurred in the
Gatekeeper.
****************************************************************************
*****

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