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Configuration Guide - Network Management and Monitoring

S1720, S2700, S5700, and S6720 V200R011C10

This document provides the configurations of network management and monitoring features supported by the product, including SNMP, RMON and RMON2, LLDP, Performance Management, iPCA, NQA, Service Diagnosis, Mirroring, Packet Capture, NetStream, sFlow, TWAMP Light, and NETCONF.

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Overview of Service Diagnosis

Overview of Service Diagnosis

Service diagnosis allows maintenance personnel to create a diagnosis object using command lines. When a user matching attributes of the diagnosis object gets online, the switch automatically creates a diagnosis instance for the user based on the diagnosis object and monitors and exports instance information including status changes and protocol processing during user access.

A diagnosis object is a database of users with some same attributes. For example, all users on an interface can be defined as a diagnosis object. A diagnosis instance is created based on a diagnosis object and maps a user.

A diagnosis object is defined based on the following attributes:
  • Interface number
  • QinQ VLAN
  • Access mode
  • User name
  • IP address
  • MAC address

Multiple users may get online or offline simultaneously and debugging information about a specified user cannot be displayed. Therefore, it is difficult to locate faults during user access based on debugging information on existing networks. Maintenance personnel need to capture information about services of a specified user.

The service diagnosis function of the switch meets this requirement.

Currently, the device supports diagnosis for Dynamic Host Configuration Protocol (DHCP), Authentication, Authorization and Accounting (AAA), and Network Admission Control (NAC) services. The switch diagnoses and exports complete key information about exchanges between modules during user access. This helps maintenance personnel know about service implementation and locate and rectify service faults based on the information. Table 8-1 describes key information about exchanges between modules during service diagnosis.

Table 8-1  Key information about exchanges between modules during service diagnosis


Key Exchange Information


DHCP server

IP address allocation, release, and lease.

DHCP client

IP address request, release, lease, and conflict.

DHCP relay

IP address request, release, and lease between the DHCP client and server.

DHCP snooping

IP address request, release, lease, and adding or deleting of dynamic DHCP snooping binding entries.


User access, authentication, authorization, and accounting.


Service diagnosis supports only common AAA users.


User access and authentication.

Updated: 2020-02-06

Document ID: EDOC1000178174

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