rfc3055.txt
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Network Working Group M. Krishnaswamy
Request for Comments: 3055 Photuris, Inc.
Category: Standards Track D. Romascanu
Avaya Communication
February 2001
Management Information Base for the PINT Services Architecture
Status of this Memo
This document specifies an Internet standards track protocol for the
Internet community, and requests discussion and suggestions for
improvements. Please refer to the current edition of the "Internet
Official Protocol Standards" (STD 1) for the standardization state
and status of this protocol. Distribution of this memo is unlimited.
Copyright Notice
Copyright (C) The Internet Society (2001). All Rights Reserved.
Abstract
This memo describes a proposed Management Information Base (MIB) for
the PSTN/Internet Interworking (PINT) Services Architecture.
Table of Contents
1. Introduction ................................................ 2
2. The SNMP Management Framework ............................... 2
3. The need for PINT Services monitoring MIB ................... 3
4. PINT MIB Overview ........................................... 4
5. Definitions ................................................. 5
6. Acknowledgements ............................................ 17
7. Security Considerations ..................................... 17
8. IANA Considerations ......................................... 18
9. Intellectual Property ....................................... 18
10. References .................................................. 18
11. Authors' Addresses .......................................... 20
12. Full Copyright Statement .................................... 21
Krishnaswamy & Romascanu Standards Track [Page 1]
RFC 3055 PINT MIB February 2001
1. Introduction
PINT services are an emerging set of new Internet based applications
where voice (and fax) requests to the PSTN (Public Switched Telephone
Network) are carried over the Internet. RFC 2458 [1] gives a good
introduction to the (pre-standard) PINT architecture and services.
It also has examples of some of the early implementations of pre-
PINT.
This document defines a MIB which contains the elements for
monitoring the performance of a PINT based service. The MIB consists
of details of the four basic PINT services and their performance
statistics measured under various criteria.
It is not the purpose of this MIB to enable management of the PINT
networking elements. We are concerned only with the PINT specific
performance parameters. While it is understood that PINT service
performance is closely related to host and network performance, they
are not addressed here.
2. The SNMP Management Framework
The SNMP Management Framework presently consists of five major
components:
o An overall architecture, described in RFC 2571 [2].
o Mechanisms for describing and naming objects and events for the
purpose of management. The first version of this Structure of
Management Information (SMI) is called SMIv1 and described in
STD 16, RFC 1155 [3], STD 16, RFC 1212 [4] and RFC 1215 [5].
The second version, called SMIv2, is described in STD 58,
RFC 2578 [6], RFC 2579 [7] and RFC 2580 [8].
o Message protocols for transferring management information. The
first version of the SNMP message protocol is called SNMPv1 and
described in STD 15, RFC 1157 [9]. A second version of the SNMP
message protocol, which is not an Internet standards track
protocol, is called SNMPv2c and described in RFC 1901 [10] and
RFC 1906 [11]. The third version of the message protocol is
called SNMPv3 and described in RFC 1906 [11], RFC 2572 [12] and
RFC 2574 [13].
o Protocol operations for accessing management information. The
first set of protocol operations and associated PDU formats is
described in STD 15, RFC 1157 [9]. A second set of protocol
operations and associated PDU formats is described in RFC 1905
[14].
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RFC 3055 PINT MIB February 2001
o A set of fundamental applications described in RFC 2573 [15] and
the view-based access control mechanism described in RFC 2575
[16].
A more detailed introduction to the current SNMP Management Framework
can be found in RFC 2570 [17].
Managed objects are accessed via a virtual information store, termed
the Management Information Base or MIB. Objects in the MIB are
defined using the mechanisms defined in the SMI.
This memo specifies a MIB module that is compliant to the SMIv2. A
MIB conforming to the SMIv1 can be produced through the appropriate
translations. The resulting translated MIB must be semantically
equivalent, except where objects or events are omitted because no
translation is possible (use of Counter64). Some machine-readable
information in SMIv2 will be converted into textual descriptions in
SMIv1 during the translation process. However, this loss of machine
readable information is not considered to change the semantics of the
MIB.
3. The need for PINT services monitoring MIB
Traditionally voice (and fax) requests originate and terminate inside
a PSTN network. This network is well known for robust handling of
the requests, in terms of availability and security. However when
the requests originate from the Internet there is a concern both on
the part of the user as well as the provider about issues like
reliable forwarding of the call requests to the PINT gateway under
various network conditions, user/host authentication, secure handling
of the user information etc. Performance and security management
becomes all the more important where PINT services cross multiple
administrative domains (or providers).
This MIB is an attempt to list the parameters that need to be
monitored on an user, PINT client, PINT server and PINT gateway
basis.
(PINT services, their invocation methods/protocols and security
issues associated with the PINT architecture are discussed in detail
in [18]).
Krishnaswamy & Romascanu Standards Track [Page 3]
RFC 3055 PINT MIB February 2001
4. PINT MIB - Overview
Following is a list of some explanations on the MIB definitions that
we have chosen to construct.
o The basic purpose of this MIB is to monitor the access to PINT
services both from the performance and security point of view.
Information may pertain to a certain user or his/her system
(PINT client) or the system providing the PINT services (PINT
server) or the PINT gateway that forwards the call to the PSTN
network.
o We chose to build the configuration table as an extension of the
Application MIB - RFC 2287 [19] using the augments construct.
Server location and contact might be retrieved from the standard
MIB-II sysLocation and sysContact objects. There is no need to
replicate this information in the PINT MIB. However, the PINT
administrator may be a different person than the sysadmin with
global responsibilities, thus a pintSysContact object is
defined.
o We chose to monitor the gateway connections from the PINT
server. While the agent runs in the PINT servers, the
connections to the gateways might need to be monitored in order
to understand what goes on. We placed them in a separate MIB
group, and by using MODULE-COMPLIANCE clauses, agents that
cannot implement this stuff will not be mandated to do it.
o There is no traps definition in this MIB module. Note that
thresholding on counters is always possible by using a standard
mechanism defined by the Remote Monitoring MIB, that can be
referenced here. Some events that may be defined by using this
mechanisms:
* continuous login/authentication failure or refusal from a
particular client or user
* nuisance call - repeated calls (within a specified
period) to a number originating from the same user
o The client performance and user performance tables may be rather
resource demanding for an agent implementation. In some MIBs,
like the Remote Monitoring (RMON) MIBs, control mechanisms were
built in order to activate those statistics on demand. If
needed, a sorting ('topN') mechanism can be designed, so that a
sorted view of clients or users is presented for the high level
debugging.
Krishnaswamy & Romascanu Standards Track [Page 4]
RFC 3055 PINT MIB February 2001
o We built a time-distribution trying to cover both short-lived,
as well as longer sessions (1-10 secs, 10 secs - 1 min., 1-15
min., 15 mins-24 hours, longer).
o PintServerClientAddress is defined as a SnmpAdminString. It may
include an IpAddress and/or name, but we preferred to minimize
the number of indices at this stage, and keep a human-readable
format at the same time.
o We define pintServerUserIdName as the UserId. This UserId needs
to be unique across multiple PINT servers and gateways
(depending on the architecture) and is mapped to the SessionId.
One way to achieve this uniqueness is by appending clientId to
the UserId string before sending to the PINT server. The
SessionId could then be a combination of this new UserId and a
timestamp.
5. Definitions
PINT-MIB DEFINITIONS ::= BEGIN
IMPORTS
OBJECT-TYPE, Counter32, MODULE-IDENTITY, mib-2
FROM SNMPv2-SMI
TEXTUAL-CONVENTION
FROM SNMPv2-TC
MODULE-COMPLIANCE, OBJECT-GROUP
FROM SNMPv2-CONF
sysApplInstallPkgEntry
FROM SYSAPPL-MIB
SnmpAdminString
FROM SNMP-FRAMEWORK-MIB; -- RFC 2571 [2]
pintMib MODULE-IDENTITY
LAST-UPDATED "200102010000Z" -- 1 Feb 2001
ORGANIZATION "IETF PINT Working Group"
CONTACT-INFO "
Chairs: Steve Bellovin
E-mail: smb@research.att.com
Igor Faynberg
E-mail: faynberg@lucent.com
Authors: Murali Krishnaswamy
Postal: 20 Corporate Place South
Piscataway, NJ 08854
Tel: +1 (732)465-1000
Krishnaswamy & Romascanu Standards Track [Page 5]
RFC 3055 PINT MIB February 2001
E-mail: murali@photuris.com
Dan Romascanu
Postal: Atidim Technology Park, Bldg 3
Tel Aviv, Israel
Tel: +972 3 6458414
E-mail: dromasca@avaya.com
General Discussion:pint@lists.bell-labs.com
To Subscribe: pint-request@lists.bell-labs.com
In Body: subscribe your-email-addres
Archive: http://www.bell-labs.com/mailing-lists/pint/
"
DESCRIPTION
"This MIB defines the objects necessary to monitor
PINT Services"
-- Revision history
REVISION "200102010000Z" -- 1 Feb 2001
DESCRIPTION
"Initial version, published as RFC 3055."
::= { mib-2 93 }
PintServiceType ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"This TC describes the type of a PINT service."
SYNTAX INTEGER {
r2C(1), -- Request-to-Talk
r2F(2), -- Request-to-Fax
r2FB(3), -- Request-to-Fax-Back
r2HC(4) -- Request-to-Hear-Content
}
PintPerfStatPeriod ::= TEXTUAL-CONVENTION
STATUS current
DESCRIPTION
"This TC describes the statistics period of time.
Note that the values of the counters indexed with a value
SinceReboot(4) can be potentially affected by a counter rollover.
It is the responsibility of the application using this object to
take into account that the counter has been zeroed each time it
reached a value of (2**32-1)."
SYNTAX INTEGER {
last30sec(1), -- Performance Statics for the last 30 sec
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RFC 3055 PINT MIB February 2001
last15min(2), -- 15 min
last24Hr(3), -- 24 Hour
sinceReboot(4) -- Since the time the pint server was
-- last rebooted
}
pintServerConfig OBJECT IDENTIFIER ::= { pintMib 1 }
pintServerMonitor OBJECT IDENTIFIER ::= { pintMib 2 }
pintMibConformance OBJECT IDENTIFIER ::= { pintMib 3 }
-- pintServerConfig - PINT configuration MIB variables
pintReleaseNumber OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of version of the PINT protocol supported
by this agent."
::= { pintServerConfig 1 }
pintSysContact OBJECT-TYPE
SYNTAX SnmpAdminString
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Contact information related to the administration of the PINT
services."
::= { pintServerConfig 2 }
pintApplInstallPkgTable OBJECT-TYPE
SYNTAX SEQUENCE OF PintApplInstallPkgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table describing the PINT applications that are installed."
::= { pintServerConfig 3 }
pintApplInstallPkgEntry OBJECT-TYPE
SYNTAX PintApplInstallPkgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries per PINT Application."
AUGMENTS { sysApplInstallPkgEntry }
::= { pintApplInstallPkgTable 1 }
PintApplInstallPkgEntry ::= SEQUENCE {
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