OBJECTS { sonetFarEndPathCurrentESs,
sonetFarEndPathCurrentSESs,
sonetFarEndPathCurrentCVs,
sonetFarEndPathCurrentUASs,
sonetFarEndPathIntervalESs,
sonetFarEndPathIntervalSESs,
sonetFarEndPathIntervalCVs,
sonetFarEndPathIntervalUASs,
sonetFarEndPathIntervalValidData }
STATUS current
DESCRIPTION
"A collection of objects providing information
specific to SONET/SDH Path interfaces,
and maintaining Path Far End information."
::= { sonetGroups 15 }
sonetFarEndVTStuff2 OBJECT-GROUP
OBJECTS { sonetFarEndVTCurrentESs,
sonetFarEndVTCurrentSESs,
sonetFarEndVTCurrentCVs,
sonetFarEndVTCurrentUASs,
sonetFarEndVTIntervalESs,
sonetFarEndVTIntervalSESs,
sonetFarEndVTIntervalCVs,
sonetFarEndVTIntervalUASs,
sonetFarEndVTIntervalValidData }
STATUS current
DESCRIPTION
"A collection of objects providing information
specific to SONET/SDH VT interfaces,
and maintaining VT Far End information."
::= { sonetGroups 16 }
END
5. Acknowledgments
This specification is a product of the AToM MIB Working Group. The
author would like to acknowledge Mike Heard for his many valuable
contributions to this memo.
6. Security Considerations
There are a number of management objects defined in this MIB that
have a MAX-ACCESS clause of read-write and/or read-create. Such
objects 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.
The managed objects in this MIB contain sensitive information since,
collectively, they allow influencing of interfaces in SONET/SDH
equipment or networks and provide information of their configuration.
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 RFC2274 [12] and the View-based
Access Control Model RFC2275 [15] 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.
7. References
[1] Harrington, D., Presuhn, R. and B. Wijnen, "An tecture for
Describing SNMP Management Frameworks", RFC2271, January 1998.
[2] Rose, M. and K. McCloghrie, "Structure and Identification of
Management Information for TCP/IP-based Internets", STD 16, RFC
1155, May 1990.
[3] Rose, M. and K. McCloghrie, "Concise MIB Definitions", STD 16,
RFC1212, March 1991.
[4] Rose, M., "A Convention for Defining Traps for use with the
SNMP", RFC1215, March 1991
[5] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.
Waldbusser, "Structure of Management Information for Version 2
of the Simple Network Management Protocol (SNMPv2)", RFC1902,
January 1996.
[6] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.
Waldbusser, "Textual Conventions for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1903, January 1996.
[7] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.
Waldbusser, "Conformance Statements for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1904, January 1996.
[8] Case, J., Fedor, M., Schoffstall, M. and J. Davin, "Simple
Network Management Protocol", STD 15, RFC1157, May 1990.
[9] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.
Waldbusser, "Introduction to Community-based SNMPv2", RFC1901,
January 1996.
[10] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.
Waldbusser, "Transport Mappings for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1906, January 1996.
[11] Case, J., Harrington D., Presuhn R. and B. Wijnen, "Message
Processing and Dispatching for the Simple Network Management
Protocol (SNMP)", RFC2272, January 1998.
[12] Blumenthal, U. and B. Wijnen, "User-based Security Model (USM)
for version 3 of the Simple Network Management Protocol
(SNMPv3)", RFC2274, January 1998.
[13] SNMPv2 Working Group, Case, J., McCloghrie, K., Rose, M. and S.
Waldbusser, "Protocol Operations for Version 2 of the Simple
Network Management Protocol (SNMPv2)", RFC1905, January 1996.
[14] Levi, D., Meyer, P. and B. Stewart, SNMPv3 Applications", RFC
2273, January 1998.
[15] Wijnen, B., Presuhn, R. and K. McCloghrie, "View-based Access
Control Model (VACM) for the Simple Network Management Protocol
(SNMP)", RFC2275, January 1998.
[16] McCloghrie, K. and M. Rose, "Management Information Base for
Network Management of TCP/IP-based internets - MIB-II", STD 17,
RFC1213, March 1991.
[17] Information processing systems - Open Systems Interconnection -
Specification of Abstract Syntax Notation One (ASN.1),
International Organization for Standardization. International
Standard 8824, (December, 1987).
[18] Information processing systems - Open Systems Interconnection -
Specification of Basic Encoding Rules for Abstract Notation One
(ASN.1), International Organization for Standardization.
International Standard 8825, (December, 1987).
[19] American National Standard for Telecommunications - Digital
Hierarchy - Optical Interface Rates and Formats Specification,
ANSI T1.105-1988.
[20] American National Standard for Telecommunications - Digital
Hierarchy - Optical Interface Rates and Formats Specification,
ANSI T1.105-1991.
[21] American National Standard for Telecommunications - Digital
Hierarchy - Optical Interface Specification (Single-Mode), ANSI
T1.106-1988.
[22] Draft American National Standard for Telecommunications -
Digital Hierarchy - Layer 1 In-Service Digital Transmission
Performance Monitoring, T1M1.3/93-005R2, July 1993.
[23] McCloghrie, K. and F. Kastenholz, "The Interfaces Group MIB",
RFC2233, November 1997.
[24] Fowler, D., "Definitions of Managed Objects for the DS3/E3
Interface Type", RFC2496, January 1999.
[25] Fowler, D., "Definitions of Managed Objects for the DS1, E1, DS2
and E2 Interface Types", RFC2495, January 1999.
[26] CCITT Recommendation G.707, "Synchronous Digital Hierarchy Bit
Rates", June 1992.
[27] CCITT Recommendation G.708, "Network Node Interface for the
Synchronous Digital Hierarchy", June 1992.
[28] CCITT Recommendation G.709, "Synchronous Multiplexing
Structure", June 1992.
[29] CCITT Recommendation G.783, "Characteristics of Synchronous
Digital Hierarchy (SDH) Multiplexing Equipment Functional
Blocks", November 1992.
[30] Brown, T. and K. Tesink, "Definitions of Managed Objects for the
SONET/SDH Interface Type", RFC1595, March 1994.
[31] American National Standard for Telecommunications - Digital
Hierarchy - Layer 1 In-Service Digital Transmission Performance
Monitoring, ANSI T1.231-1993, September 1993.
[32] Bellcore TR-NWT-000253, Issue 1, "Synchronous Optical Network
(SONET) Transport Systems: Common Generic Criteria", December
1991.
[33] ITU Recommendation G.826, "Error Performance Parameters and
Objectives for International Constant Bit Rate Digital Paths at
or above Primary Rate", September 1995 (COM 13-R57E).
[34] Bellcore GR-253-CORE, Issue 2, "Synchronous Optical Network
(SONET) Transport Systems Common Generic Criteria", December
1995.
[35] American National Standard for Telecommunications - Digital
Hierarchy - Layer 1 In-Service Digital Transmission Performance
Monitoring, ANSI T1.231-1997, September 1997.
[36] Tesink, K., " Textual Conventions for MIB Modules Using
Performance History Based on 15 Minute Intervals", RFC2493,
January 1999.
8. Author's Address
Kaj Tesink
Telcordia Technologies
331 Newman Springs Road
P.O. Box 7020
Red Bank, NJ 07701-7020
Phone: (732) 758-5254
EMail: kaj@research.telcordia.com
9. Intellectual Property
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.
Appendix A: The delay-line approach to statistics collection.
According to ANSI T1.231 unavailable time begins at the onset of 10
contiguous severely errored seconds -- that is, unavailable time
starts with the first of the 10 contiguous SESs -- and while an
interface is deemed unavailable all counters for that interface are
frozen except for the UAS count. Since changes in the signal state
lag the data to which they apply by 10 seconds, an implementation
which wishes to avoid making retroactive adjustments to the counts
must pass the the one-second statistics through a 10-second delay
line prior to updating any counters. That can be done by performing
the following steps at the end of each one second interval.
i) Read near/far end line and path CV counts and alarm status flags
from the hardware.
ii) Accumulate the CV counts for the preceding second and compare
them to the ES and SES threshold for the layer in question.
Update the signal state and shift the one-second CV counts and
ES/SES flags into the 10-element delay line. Note that far-end
one-second statistics are to be flagged as "absent" during any
second in which there is an incoming defect at the layer in
question or at any lower layer.
iii) Update the current interval statistics using the signal state
from the previous update cycle and the one-second CV counts and
ES/SES flags shifted out of the 10-element delay line.
This procedure guarantees that the statistical counters will be
correctly updated at all times, although they lag real time by 10
seconds. It is illustrated in the figure below. At the end of each
15 minutes interval the current interval counts are transferred to
the most recent interval entry and each interval is shifted up by
one position, with the oldest being discarded if necessary in order
to make room. The current interval counts then start over from zero.
Note, however, that the signal state calculation does not start anew
at each interval boundary; rather, signal state information is
retained across interval boundaries.
+--------------------------------------------------------------+
| READ COUNTERS & STATUS INFO FROM HARDWARE |
| |
|LOS OOF/ SECT LINE LINE LINE LINE PATH PATH PATH PATH PATH |
| LOF CV AIS CV RDI FEBE AIS LOP CV RDI CV |
+--------------------------------------------------------------+
| | | | | | | | | | | |
| | | | | | | | | | | |
V V V V V V V V V V V V
+--------------------------------------------------------------+
| ACCUM ONE-SEC STATS, CHK ERR THRESHOLDS, & UPDT SIGNAL STATE |
| |
| |
| NEAR END/FAR END NEAR END/FAR END |
|SECT SECT SECT LINE LINE LINE LINE PATH PATH PATH PATH |
|CV ES SES CV ES SES AVA/UNA CV ES SES AVA/UNA |
+--------------------------------------------------------------+
| | | | | | | | | | |
| | | | | | | | | | |
V V V V V V | V V V |
+-------------+ +-------------+ | +-------------+ |
|ONE-SEC DELAY| |ONE-SEC DELAY| | |ONE-SEC DELAY| |
| (1 OF 10) | | (1 OF 10) | | | (1 OF 10) | |
|CV ES SES| |CV ES SES| | |CV ES SES| |
+-------------+ +-------------+ | +-------------+ |
| | | | | | | | | | |
/ / / / / / / / / / /
/ / / / / / / / / / /
| | | | | | | | | | |
V V V V V V | V V V |
+-------------+ +-------------+ | +-------------+ |
|ONE-SEC DELAY| |ONE-SEC DELAY| | |ONE-SEC DELAY| |
| (10 OF 10) | | (10 OF 10) | | | (10 OF 10) | |
|CV ES SES| |CV ES SES| | |CV ES SES| |
+-------------+ +-------------+ | +-------------+ |
| | | | | | | | | | |
| | | | | | | | | | |
V V V V V V V V V V V
+--------------------------------------------------------------+
| UPDATE STATISTICS COUNTERS |
| |
| NEAR END/FAR END NEAR END/FAR END |
| SECTION LINE PATH |
| CV ES EFS SES CV ES EFS SES AS UAS CV ES EFS SES AS UAS |
+--------------------------------------------------------------+
Note that if such a procedure is adopted there is no current interval
data for the first ten seconds after a system comes up.
noSuchInstance must be returned if a management station attempts to
access the current interval counters during this time.
It is an implementation-specific matter whether an agent assumes that
the initial state of the interface is available or unavailable.
Appendix B - RFC1595 SES interpretation
This appendix contains the values for x for the Section, Line, Path,
and VT Layers as used in [22][30][32].
Value for x for SONET/SDH Section SES Definition
Rate x Minimum Bit Error Rate
=======================================================
OC-1 9 1.5 x 10^-7
OC-3 16 1 x 10^-7
OC-9 47 1 x 10^-7
OC-12 63 1 x 10^-7
OC-18 94 1 x 10^-7
OC-24 125 1 x 10^-7
OC-36 187 1 x 10^-7
OC-48 249 1 x 10^-7
Value for x for SONET/SDH Line SES Definition
Rate x Minimum Bit Error Rate
=======================================================
OC-1 12 2 x 10^-7
OC-3 32 2 x 10^-7
OC-9 47 2 x 10^-7
OC-12 124 2 x 10^-7
OC-18 186 2 x 10^-7
OC-24 248 2 x 10^-7
OC-36 370 2 x 10^-7
OC-48 494 2 x 10^-7
Value for x for SONET/SDH STS-Path SES Definition
Rate x Minimum Bit Error Rate
=======================================================
STS-1 9 1.5 x 10^-7
STS-3 16 1 x 10^-7
Value for x for SONET/SDH VT-Path SES Definition
Rate x Minimum Bit Error Rate
=======================================================
VT1.5 4 2 x 10^-6
VT2 6 2 x 10^-6
VT3 8 2 x 10^-6
VT6 14 2 x 10^-6
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