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AR Router Troubleshooting Guide

This Product Documentation provides guidance for maintaining AR Enterprise Router, covering common information collection and fault diagnostic commands, typical fault troubleshooting guide, and troubleshooting.
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An SNMP Connection Cannot Be Established

An SNMP Connection Cannot Be Established

Common Causes

This fault is commonly caused by one of the following:
  • Packets cannot be exchanged between the host and the NMS.

  • Configurations are incorrect.

Troubleshooting Flowchart

Figure 14-5  Troubleshooting flowchart used when an SNMP connection cannot be established

Troubleshooting Procedure

NOTE:

Saving the results of each troubleshooting step is recommended. If your troubleshooting fails to correct the fault, you will have a record of your actions to provide Huawei technical support personnel.

Procedure

  1. Run the ping command to check whether the host and the NMS can successfully ping each other.

    • If the ping fails, see The Ping Operation Fails to locate the problem so that the host and NMS can ping each other.

    • If the ping succeeds, the host and the NMS are reachable. Go to Step 2.

  2. Check whether the SNMP configuration on the host is correct.

    • If the SNMP configuration is incorrect, modify the configuration based on Table 14-1.
    • If the SNMP configuration is correct, go to step 3.
    Table 14-1  SNMP configuration

    Item

    Method

    Troubleshooting Procedure

    Check whether the host supports the SNMP version used by the NMS for sending a login request.

    Run the display snmp-agent sys-info version command to view the SNMP version of the host.

    If the host does not support the SNMP version, run the snmp-agent sys-info version command to set the SNMP version on the host.

    View the community string configured on the host.

    Run the display snmp-agent community command.

    If the community string used by the NMS for sending a login request is different from that configured on the host, run the snmp-agent community command to configure a read-write community string, which must be identical to that configured on the host.

    If SNMPv3 is used, check whether information about the SNMP user group and users is correct.

    • Run the display snmp-agent group command to view information about the SNMPv3 user group.
    • Run the display snmp-agent usm-user command to view the SNMPv3 user information.
    If information is incorrect, modify the configurations.
    • Run the snmp-agent group command to view information about the SNMPv3 user group.
    • Run the snmp-agent usm-user command to view information about the SNMPv3 user.

  3. Run the display snmp-agent community command to view the community string configured on the host.

    • If the IP address from which the NMS sends login requests is denied by the ACL, run the rule command to enable the ACL to permit the IP address from which the NMS sends login requests.
    • If the IP address from which the NMS sends login requests is permitted by the ACL, go to Step 4.

  4. Collect the following information and contact technical support personnel:

    • Results of the preceding troubleshooting procedure
    • Configuration files, log files, and alarm files of the devices

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Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 444023

Downloads: 4295

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