This guide describes the Cisco ASR 1000 Series Aggregation Services Routers implementation of the Simple Network Management Protocol (SNMP). SNMP provides a set of commands for setting and retrieving the values of operating parameters on the Cisco ASR 1000 Series Router. Router information is stored in a virtual storage area called a Management Information Base (MIB), which contains many MIB objects that describe router components and provides information about the status of the components.
This preface provides an overview of this guide, and contains the following sections:
The following Revision History tables record technical changes, additions, and corrections to this document. The tables show the release number and document revision number pertaining to the change, the date of the change, and a summary of the change.
Provides information about how to implement Quality of Service (QoS) in addition to a matrix that defines which objects support QoS policy actions.
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 (seethe 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 whose primary function is other than management, RMON was created to provide management of a network. RMON is one of the many SNMP-based MIBs that are 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.
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