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Network Working Group Request for Comments: 3055 Category: Standards Track |
M. Krishnaswamy Photuris, Inc. D. Romascanu Avaya Communication February 2001 |
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 © The Internet Society (2001). All Rights Reserved.
This memo describes a proposed Management Information Base (MIB) for the PSTN/Internet Interworking (PINT) Services Architecture.
1. Introduction
2. The SNMP Management Framework
3. The need for PINT Services monitoring MIB
4. PINT MIB Overview
5. Definitions
6. Acknowledgements
7. Security Considerations
8. IANA Considerations
9. Intellectual Property
10. References
11. Authors' Addresses
12. Full Copyright Statement
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.
The SNMP Management Framework presently consists of five major components:
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.
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]).
Following is a list of some explanations on the MIB definitions that we have chosen to construct.
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
Igor Faynberg
E-mail: faynberg@lucent.com
Authors: Murali Krishnaswamy
Postal: 20 Corporate Place South
Piscataway, NJ 08854
Tel: +1 (732)465-1000
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/
"
-- Revision history
::= { 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
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)."
-- last rebooted}
pintServerConfig OBJECT IDENTIFIER ::= { pintMib 1 }
pintServerMonitor OBJECT IDENTIFIER ::= { pintMib 2 }
pintMibConformance OBJECT IDENTIFIER ::= { pintMib 3 }
-- pintServerConfig - PINT configuration MIB variables
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"An indication of version of the PINT protocol supported
by this agent."
::= { pintServerConfig 1 }
SYNTAX SnmpAdminString
MAX-ACCESS read-write
STATUS current
DESCRIPTION
"Contact information related to the administration of the PINT
services."
::= { pintServerConfig 2 }
SYNTAX SEQUENCE OF PintApplInstallPkgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table describing the PINT applications that are installed."
::= { pintServerConfig 3 }
SYNTAX PintApplInstallPkgEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries per PINT Application."
AUGMENTS { sysApplInstallPkgEntry }
::= { pintApplInstallPkgTable 1 }
PintApplInstallPkgEntry ::= SEQUENCE {
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Textual description of the installed PINT application."
::= { pintApplInstallPkgEntry 1 }
SYNTAX SEQUENCE OF PintRegisteredGatewayEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table describing the registered gateway applications."
::= { pintServerConfig 4 }
SYNTAX PintRegisteredGatewayEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries per Registered Gateway Application."
::= { pintRegisteredGatewayTable 1 }
PintRegisteredGatewayEntry ::= SEQUENCE {
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Name of the registered gateway."
::= { pintRegisteredGatewayEntry 1 }
SYNTAX SnmpAdminString
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Textual description of the registered gateway."
::= { pintRegisteredGatewayEntry 2 }
-- pintServerMonitor - PINT monitoring statistics MIB variables
pintServerGlobalPerf OBJECT IDENTIFIER ::= {pintServerMonitor 1 }
pintServerClientPerf OBJECT IDENTIFIER ::= {pintServerMonitor 2 }
pintServerUserIdPerf OBJECT IDENTIFIER ::= {pintServerMonitor 3 }
pintServerGatewayPerf OBJECT IDENTIFIER ::= {pintServerMonitor 4 }
SYNTAX SEQUENCE OF PintServerGlobalStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table displaying the monitored global server statistics."
::= { pintServerGlobalPerf 1 }
SYNTAX PintServerGlobalStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries in the global statistics table.
One entry is defined for each monitored service type and
performance statistics collection period."
INDEX {pintServerServiceTypeIndex, pintServerPerfStatPeriodIndex}
::= { pintServerGlobalStatsTable 1 }
PintServerGlobalStatsEntry ::= SEQUENCE {
SYNTAX PintServiceType
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The unique identifier of the monitored service."
::= { pintServerGlobalStatsEntry 1 }
SYNTAX PintPerfStatPeriod
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Time period for which the performance statistics are requested
from the pint server."
::= { pintServerGlobalStatsEntry 2 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of received global calls."
::= { pintServerGlobalStatsEntry 3 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of global successful calls."
::= { pintServerGlobalStatsEntry 4 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of global disconnected (failed) calls."
::= { pintServerGlobalStatsEntry 5 }
::= { pintServerGlobalStatsEntry 6 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of global calls that were disconnected because of
server problems."
::= { pintServerGlobalStatsEntry 7 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of global calls that were disconnected because of
gateway problems."
::= { pintServerGlobalStatsEntry 8 }
SYNTAX SEQUENCE OF PintServerClientStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table displaying the monitored server client statistics."
::= { pintServerClientPerf 1 }
SYNTAX PintServerClientStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries in the client server statistics table.
One entry is defined for each client identified by name,
monitored service type and performance statistics collection
period."
INDEX {pintServerClientAddress, pintServerServiceTypeIndex,
pintServerPerfStatPeriodIndex}
::= { pintServerClientStatsTable 1 }
PintServerClientStatsEntry ::= SEQUENCE {
SYNTAX SnmpAdminString
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The unique identifier of the monitored client
identified by its address represented as as a string."
::= { pintServerClientStatsEntry 1 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls received from the specific client."
::= { pintServerClientStatsEntry 2 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls from the client successfully completed."
::= { pintServerClientStatsEntry 3 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls received from the client, and that were
disconnected (failed)."
::= { pintServerClientStatsEntry 4 }
::= { pintServerClientStatsEntry 5 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls from the client that were disconnected because
of egress facility problems."
::= { pintServerClientStatsEntry 6 }
SYNTAX SEQUENCE OF PintServerUserIdStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table displaying the monitored Pint service user statistics."
::= { pintServerUserIdPerf 1 }
SYNTAX PintServerUserIdStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries in the user statistics table.
One entry is defined for each user identified by name,
each monitored service type and performance statistics collection
period.
It is assumed that the capabilities of the pint server are enough to accommodate the number of entries in this table. It is a local server implementation issue if an aging mechanism Is implemented in order to avoid scalability problems." INDEX {pintServerUserIdName, pintServerServiceTypeIndex, pintServerPerfStatPeriodIndex}
::= { pintServerUserIdStatsTable 1 }
PintServerUserIdStatsEntry ::= SEQUENCE {
SYNTAX SnmpAdminString (SIZE(0..64))
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"The unique identifier of the monitored user
identified by its name."
::= { pintServerUserIdStatsEntry 1 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls received from the specific user."
::= { pintServerUserIdStatsEntry 2 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls from the user successfully completed."
::= { pintServerUserIdStatsEntry 3 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls received from the user that were
disconnected (failed)."
::= { pintServerUserIdStatsEntry 4 }
::= { pintServerUserIdStatsEntry 5 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls from the user that were disconnected because of
egress facility problems."
::= { pintServerUserIdStatsEntry 6 }
SYNTAX SEQUENCE OF PintServerGatewayStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Table displaying the monitored gateway statistics."
::= { pintServerGatewayPerf 1 }
SYNTAX PintServerGatewayStatsEntry
MAX-ACCESS not-accessible
STATUS current
DESCRIPTION
"Entries in the gateway table.
One entry is defined for each gateway identified by name,
each monitored service type and performance statistics collection
period."
INDEX { pintRegisteredGatewayName, pintServerServiceTypeIndex, pintServerPerfStatPeriodIndex }
::= { pintServerGatewayStatsTable 1 }
PintServerGatewayStatsEntry ::= SEQUENCE {
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls received at the specified gateway."
::= { pintServerGatewayStatsEntry 1 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls successfully completed at the specified gateway."
::= { pintServerGatewayStatsEntry 2 }
SYNTAX Counter32
MAX-ACCESS read-only
STATUS current
DESCRIPTION
"Number of calls that were disconnected (failed) at the specified
gateway."
::= { pintServerGatewayStatsEntry 3 }
--
-- Notifications Section
-- (none defined)
-- --
-- Conformance Section
--
pintMibCompliances OBJECT IDENTIFIER ::= { pintMibConformance 1 }
pintMibGroups OBJECT IDENTIFIER ::= { pintMibConformance 2 }
::= { pintMibCompliances 1 }
::= { pintMibGroups 1 }
--pintServerUserIdName,
::= { pintMibGroups 2 }
The authors would like to thank Igor Faynberg for his encouragement to produce this work.
There is only one management object defined in this MIB that has a MAX-ACCESS clause of read-write (pintSysContact). There are no read-create objects. This read-write object may be considered sensitive or vulnerable in some network environments. The support for SET operations in a non-secure environment without proper protection can have a negative effect on network operations.
There are a number of managed objects in this MIB that may contain information that may be sensitive from a business perspective. One could be the customer identification (UserIdName). Also information on PINT services performance might itself be need to be guarded. It is thus important to control even GET access to these objects and possibly to even encrypt the values of these object when sending them over the network via SNMP. Not all versions of SNMP provide features for such a secure environment.
SNMPv1 by itself is not a secure environment. Even if the network itself is secure (for example by using IPSec), even then, there is no control as to who on the secure network is allowed to access and GET/SET (read/change/create/delete) the objects in this MIB.
It is recommended that the implementers consider the security features as provided by the SNMPv3 framework. Specifically, the use of the User-based Security Model RFC 2574 [13] and the View-based Access Control Model RFC 2575 [16] is recommended.
It is then a customer/user responsibility to ensure that the SNMP
entity giving access to an instance of this MIB, is properly
configured to give access to the objects only to those principals
(users) that have legitimate rights to indeed GET or SET
(change/create/delete) them.
All extensions to the values listed in this MIB must be done through Standards Action processes as defined in RFC 2434 [20].
The IETF takes no position regarding the validity or scope of any intellectual property or other rights that might be claimed to pertain to the implementation or use of the technology described in this document or the extent to which any license under such rights might or might not be available; neither does it represent that it has made any effort to identify any such rights. Information on the IETF's procedures with respect to rights in standards-track and standards-related documentation can be found in BCP-11. Copies of claims of rights made available for publication and any assurances of licenses to be made available, or the result of an attempt made to obtain a general license or permission for the use of such proprietary rights by implementors or users of this specification can be obtained from the IETF Secretariat.
The IETF invites any interested party to bring to its attention any copyrights, patents or patent applications, or other proprietary rights which may cover technology that may be required to practice this standard. Please address the information to the IETF Executive Director.
[1] Lu, H., Conroy, L., Bellovin, S., Krishnaswamy, M., Burg, F., DeSimone, A., Tewani, K., Davidson, P., Schulzrinne, H. and K. Vishwanathan, "Toward the PSTN/Internet Inter-Networking -- Pre-PINT Implementations", RFC 2458, November 1998.
[2] Wijnen, B., Harrington, D. and R. Presuhn, "An Architecture for Describing SNMP Management Frameworks", RFC 2571, April 1999.
[3] Rose, M. and K. McCloghrie, "Structure and Identification of Management Information for TCP/IP-based Internets", STD 16, RFC 1155, May 1990.
[4] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16, RFC 1212, March 1991.
[5] Rose, M., "A Convention for Defining Traps for use with the SNMP", RFC 1215, March 1991.
[6] McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Structure of Management Information Version 2 (SMIv2)", STD 58, RFC 2578, April 1999.
[7] McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Textual Conventions for SMIv2", STD 58, RFC 2579, April 1999.
[8] McCloghrie, K., Perkins, D. and J. Schoenwaelder, "Conformance Statements for SMIv2", STD 58, RFC 2580, April 1999.
[9] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple Network Management Protocol", STD 15, RFC 1157, May 1990.
[10] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Introduction to Community-based SNMPv2", RFC 1901, January 1996.
[11] Case, J., McCloghrie, K., Rose, M. and S. Waldbusser, "Transport Mappings for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1906, January 1996.
[12] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message Processing and Dispatching for the Simple Network Management Protocol (SNMP)", RFC 2572, April 1999.
[13] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM) for version 3 of the Simple Network Management Protocol (SNMPv3)", RFC 2574, April 1999.
[14] Case, J., McCloghrie, K., Rose, M. and Waldbusser, "Protocol Operations for Version 2 of the Simple Network Management Protocol (SNMPv2)", RFC 1905, January 1996.
[15] Levi, D., Meyer, P. and B. Stewart, "SNMPv3 Applications", RFC 2573, April 1999.
[16] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access Control Model (VACM) for the Simple Network Management Protocol (SNMP)", RFC 2575, April 1999.
[17] Case, J., Mundy, R., Partain, D. and B. Stewart, "Introduction to Version 3 of the Internet-standard Network Management Framework", RFC 2570, April 1999.
[18] Petrack, S. and L. Conroy, "The PINT Service Protocol: Extensions to SIP and SDP for IP Access to Telephone Call Services", RFC 2848, June 2000.
[19] Krupczak, C. and J. Saperia, "Definitions of System-Level Managed Objects for Applications", RFC 2287, February 1998.
[20] Narten, T. and H. Alvestrand, "Guidelines for Writing an IANA Considerations Section in RFCs", BCP 26, RFC 2434, October 1998.
Murali Krishnaswamy
Lucent Technologies
3C-512, 101 Crawfords Corner Rd.
Holmdel, NJ 07733
Phone: +1 (732)949-3611
Fax: +1 (732)949-3210 EMail: murali@lucent.com
Dan Romascanu
Avaya Communication
Atidim Technology Park, Bldg 3
Tel Aviv, Israel
Phone: +972 3 6458414
EMail: dromasca@avaya.com
Copyright © The Internet Society (2001). All Rights Reserved.
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