Preface
This guide describes the implementation of the Simple Network Management Protocol (SNMP) for the Cisco Cable Modem Termination System (CMTS) routers.
SNMP provides a set of commands for setting and retrieving the values of operating parameters on the router. Router information is stored in a virtual storage area called a Management Information Base (MIB). The MIB contains objects that describe router components and provides information about the status of these components.
This preface provides an overview of this guide with the following sections:
- Document Revision History
- Audience
- Organization
- Obtaining Documentation and Submitting a Service Request
Document Revision History
This guide contains MIB information of:
For MIB information of later releases, use the Cisco MIB Locater tool.
The following Revision History tables record technical changes, additions, and corrections to this document.
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The CISCO-DOCS-EXT-MIB is updated with the following MIB tables: |
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The CISCO-DOCS-EXT-MIB is updated: |
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The CISCO-CABLE-WIDEBAND-MIB is modified:
The Background Synchronization feature is introduced. |
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The ifIndex object of MIB objects that pointed to the modular or the integrated interfaces now points to the cable interface and RF channels SNMP IF Index of the uBR-MC3GX60V, UBR-MC20X20V and uBR-MC88V line cards, and SPAs. Following are the MIBs and their tables where the ifIndex object points to the RF channel SNMP IF index:
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Audience
This guide is intended for system and network administrators who must configure the Cisco CMTS Router for operation and monitor its performance in the network.
This guide may also be useful for application developers who are developing management applications for the router.
Organization
This guide contains the following chapters:
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Provides background information about SNMP and its implementation on Cisco CMTS routers. |
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Provides instructions for configuring SNMP management support on the router. |
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Describes each MIB included in the software image. Each description lists any constraints as to how the MIB is implemented on the router. |
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Describes the SNMP traps and notifications supported by the router. |
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Chapter B, “Relationship Between MIB Objects and CLI Show Commands” |
Provides a cross-reference between commonly used objects in the MIBs and the related cable-related show commands. |
Terminology and Definitions
This section discusses conventions and terminology used in this guide.
- Alarm—In SNMP, the word alarm is commonly misused to mean the same as a trap (see the Trap definition below). Alarm represents a condition which causes an SNMP trap to be generated.
Note
Many commands use the word traps in the command syntax. Unless there is an option in the command to select either traps or informs, the keyword traps refers to traps, informs, or both. Use the snmp-server host and snmp-server enable notification command to specify whether to send SNMP notifications as traps or informs.
- Element Management System (EMS)—An EMS manages a specific portion of the network. For example, the SunNet Manager, an SNMP management application, is used to manage SNMP-manageable elements. Element Managers may manage asynchronous lines, multiplexers, Private Automatic Branch Exchange (PABX), proprietary systems, or an application.
- Inform—Reliable SNMP notifications that are stored in memory until the SNMP manager issues a response. Informs use more system resources than traps. The SNMP Inform mechanism can be used when a reliable fault reporting system is required.
- Lawful Intercept (LI)—The term used to describe the process by which law enforcement agencies conduct electronic surveillance as authorized by judicial or administrative order. Legislation and regulations are increasingly being adopted that require service providers (SPs) to design and implement their networks to explicitly support authorized electronic surveillance.
- Management Information Base (MIB)—The objects that are available in an SNMP-managed device. The information is represented in Abstract Syntax Notation 1 (ASN.1). This is a way of logically grouping data so that it is easily understood by all.
- MIB-II—The successor to MIB-I, which was the original standard SNMP MIB.
- Multiprotocol Label Switching (MPLS)—MPLS is the standardized version of the Cisco original tag-switching proposal. It uses a label-forwarding paradigm (forward packets based on labels).
- Remote Network Monitoring (RMON) MIB—SNMP MIB for remote management of networks. While other MIBs are usually created to support a network device with primary function other than management, RMON was created to provide management of a network. RMON is one of the many SNMP-based MIBs that are of IETF Standards.
- Simple Network Management Protocol (SNMP)—An application layer protocol that allows you to remotely manage networked devices. The simple in SNMP is only in contrast to protocols that are thought to be even more complex than SNMP. SNMP consists of the following components: a management protocol, a definition of management information and events, a core set of management information and events, and a mechanism and approach used to manage the use of the protocol including security and access control.
- Synchronous Optical Network (SONET)—A physical layer interface standard for fiber-optic transmission.
- Trap—A device-initiated SNMP notification message. The contents of the message might be simply informational, but it is mostly used to report real-time trap information. Traps can be used in conjunction with other SNMP mechanisms, as in trap-directed polling.
- User Datagram Protocol (UDP)—A connectionless, non-reliable IP-based transport protocol.
Obtaining Documentation and Submitting a Service Request
For information on obtaining documentation, using the Cisco Bug Search Tool (BST), submitting a service request, and gathering additional information, see What’s New in Cisco Product Documentation at: http://www.cisco.com/en/US/docs/general/whatsnew/whatsnew.html.
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