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eSight V300R010C00SPC200, 300, and 500 Self-Service Integration Guide 10

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Huawei uses machine translation combined with human proofreading to translate this document to different languages in order to help you better understand the content of this document. Note: Even the most advanced machine translation cannot match the quality of professional translators. Huawei shall not bear any responsibility for translation accuracy and it is recommended that you refer to the English document (a link for which has been provided).
Protocol Overview

Protocol Overview

Simple Network Management Protocol (SNMP) is one of the widely applied network management protocols in the TCP/IP network. It aims to transmit management information between two nodes.

The features of the SNMP are as follows:

  • Helps network administrators search and modify information.
  • Applies to small-scale, fast, and cost-effective networks.
  • Complies with connectionless UDP, and is supported by many products.

Network Management Framework

SNMP is a set of protocols and standards. It provides channels for the third-party system to collect network management data from network equipment and for network equipment to report problems and errors to the third-party system.

The SNMP network management framework consists of the network management system (NMS), agent, management information base (MIB), and SNMP protocols. Figure 4-1 shows the relationships between them.

Figure 4-1 Network management framework

Concept

Description

NMS

The NMS is an independent system that runs network management applications.

The NMS sends query packets to NEs and receives responses or traps from NEs.

In this document, it is called the third-party system.

SNMP agent

The SNMP agent is a process that runs on NEs.

It receives, parses, and authenticates query packets from the NMS.

It searches the MIB tree, calls other modules for operations, constructs responses, and sends them to the NMS.

In emergency, it constructs traps and sends them to the NMS.

The SNMP agent is located on the eSight.

MIB

The MIB is a collection of equipment that the agent can query or set.

The eSight MIB is located in the directory parallel with this document.

SNMP

SNMP is an application-layer protocol carried over UDP in the TCP/IP structure. It is used to exchange management information between the NMS and agents.

MIB

The MIB is a key part of the SNMP network management framework.

The MIB covers all managed objects (MOs) and is a group of SNMP-based entities. The MIB structure resembles a tree, and therefore is called a MIB tree, as shown in Figure 4-2. Each MO maps to a leaf node, also called an object or object identifier (OID). The MIB tree is static. After the agent is started and the MIB is initialized, the NMS queries or modifies MOs based on the current MIB. The NMS manages the MIB in read and write mode.

All MOs in a network are displayed as leaf nodes in the MIB tree. An MO is identified by OID, a unique path that originates from the root node to the leaf node. An OID consists of a set of integers greater than or equal to 0 and uniquely identifies an MO in the MIB tree. The structure of management information (SMI) ensures that an MO maps to a unique OID.

In the MIB tree as shown in Figure 4-2, the MO mgmt is marked { iso(1) org(3) dod(6) internet(1) mgmt(2) } or simply 1.3.6.1.2.

Figure 4-2 MIB tree

For the eSight, the MIB defines MOs that are used by the function interfaces of the SNMP NBI. These definitions are extremely important for the eSight in that they determine what operations the third-party system can perform and what network management information the third-party system can obtain.

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Updated: 2019-10-30

Document ID: EDOC1100044386

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