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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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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).
Checking Services

Checking Services

All the services on the router must run normally.

NOTE:

The following check methods apply to all views, unless otherwise specified.

No.

Check Item

Command

Criteria

Result

Multicast

Information about multicast member interfaces and router interfaces

Run the display igmp-snooping port-info command.

Information about static member interfaces, dynamic member interfaces, static router interfaces, and dynamic router interfaces is correct.

□ Satisfied

□ Unsatisfied

□ Not involved

Multicast packet statistics

Run the display igmp-snooping statistics vlan command.

The number of IGMP messages sent by a vlan is correct, the number of IGMP messages and PIM Hello messages received by a VLAN is correct, and the number of Layer 2 events in all the VLANs is correct.

□ Satisfied

□ Unsatisfied

□ Not involved

Multicast forwarding table

  • Run the display l2-multicast forwarding-table vlan vlanid command to view the Layer 2 multicast forwarding table.

  • Run the display multicast forwarding-table command to view the Layer 3 multicast forwarding table.

The multicast forwarding entries are correct.

□ Satisfied

□ Unsatisfied

□ Not involved

Multicast routing protocol

Run the display multicast routing-table command.

  • The intra-domain multicast routing protocol should be PIM-SM.

  • All the multicast interfaces should be enabled with IGMP.

□ Satisfied

□ Unsatisfied

□ Not involved

IP Service

IP traffic statistics

Run the display ip statistics command and collect the data.

After five seconds, run the command again. Then collect the data and compare the data.
  • Both the number of error packets and the number of TTL expired packets in a single collection should be smaller than 100.
  • Normally, the number of error packets and the number of TTL expired packets should remain the same in the second collection.

□ Satisfied

□ Unsatisfied

□ Not involved

ICMP traffic statistics

Run the display icmp statistics command.

Both the value of "destination unreachable" and the value of "redirects" are not more than 100.

□ Satisfied

□ Unsatisfied

□ Not involved

IP address pool

Run the display ip pool command.

The value of "Conflict" is 0.

□ Satisfied

□ Unsatisfied

□ Not involved

NAT ALG Status

Run the display nat alg command.

Check whether the status of "dns","ftp","rtsp", and "sip" is correct.

□ Satisfied

□ Unsatisfied

□ Not involved

NAT Server Configuration

Run the display nat server command.

Check whether "Global IP/Port" and "Inside IP/Port" are configured correctly.

□ Satisfied

□ Unsatisfied

□ Not involved

NAT session table

Run display nat session all verbose command.

Check whether "New SrcAddr", "New SrcPort", "New DestAddr", and "New DestPort" are correct after NAT translation.

□ Satisfied

□ Unsatisfied

□ Not involved

WAN

PPP protocol status

Run the display interface serial command.

When the"current state" is "UP", the "Line protocol current state" must be "UP".

□ Satisfied

□ Unsatisfied

□ Not involved

FR protocol status

Run the display interface mfr command.

When the "current state" is Up, the "Line protocol current state" must be Up.

□ Satisfied

□ Unsatisfied

□ Not involved

MP binding

Run the display ppp mp command.

The number of bound links is correct.

□ Satisfied

□ Unsatisfied

□ Not involved

3G/LTE

Call session

Run display cellular interface number all command.

  • The "Current Service Status" is displayed as "Service available".
  • The "Packet Session Status" is displayed as "Active".

□ Satisfied

□ Unsatisfied

□ Not involved

Reliability

Backup interface status

Run the display interface brief command.

The physical status of the backup interface is "^ down".

□ Satisfied

□ Unsatisfied

□ Not involved

VRRP status

  • Run the display vrrp command.

  • Run the display vrrp statistics command.

  • The value of "State" should not be "Initialize."

  • The VRRP status of the backup node in the VRRP group cannot be "Master."

  • The values of "Checksum errors", "Version errors," and "Vrid errors" should be 0.

□ Satisfied

□ Unsatisfied

□ Not involved

BFD session status

  • Run display bfd session all verbose command.

  • Run the display bfd statistics command.

The status of all BFD sessions is Up.

□ Satisfied

□ Unsatisfied

□ Not involved

MSTP

MSTP status

Run the display stp brief command.

  • The "STP State"of the specified port and the root port should be "FORWARDING".
  • The "STP State" of the backup root port should be "DISCARDING".

□ Satisfied

□ Unsatisfied

□ Not involved

MST region

Run the display stp region-configuration command.

The name, revision level, VLAN-MSTI mappings, and digest of the MST region should meet the requirements.

□ Satisfied

□ Unsatisfied

□ Not involved

MSTP topology changes

Run the display stp topology-change command.

  • Display statistics about MSTP topology changes.

  • If the number of topology changes keeps increasing, network flapping occurs.

□ Satisfied

□ Unsatisfied

□ Not involved

Number of TC/TCN BPDUs

Run the display stp tc-bpdu statistics command and collect the data.

After five minutes, run the command again. Then collect the data and compare the data.

Normally, the number in the second collection does not increase or increase a little.

□ Satisfied

□ Unsatisfied

□ Not involved

Routing information

Routing table information

Run the display ip routing-table command.

  • A default route or precise route exists for remote fault locating.
  • On all the devices running the same routing protocol at the same layer of a network, the number of routing entries should be almost identical. If static routes are configured, the routing entries in the routing tables of different devices may differ.

□ Satisfied

□ Unsatisfied

□ Not involved

OSPF errored packets

Run the display ospf error command. After five minutes, run the command again. Then collect data twice and compare the data.

  • In the normal situation, the collected data does not increase.

□ Satisfied

□ Unsatisfied

□ Not involved

OSPF neighbor status

IS-IS neighbor status

BGP peer status

Run the display ospf peer command.

Run the display ospf peer last-nbr-down command.

Run the display isis peer command.

Run the display bgp peer command.

OSPF neighbor status

  • The value of "State" should be "Full."

  • The neighbor relationship should be retained for at least one day.

  • Normally, no neighbor is in Down state.

IS-IS neighbor status

  • The value of "State" should be "Up."

BGP peer status
  • The value of "State" should be "Established."

□ Satisfied

□ Unsatisfied

□ Not involved

OSPF Router ID

Run the display current-configuration configuration ospf command.

  • The router ID should be the address of the Loopback interface.

  • If no address is assigned to the Loopback interface, you must specify the router ID as the address of an uplink interface or the interface with minimum probability of being Down.

□ Satisfied

□ Unsatisfied

□ Not involved

Importing OSPF routes

Run the display current-configuration configuration ospf command.

You are advertised to import routes in Network mode. You can also import routes in Import mode.

□ Satisfied

□ Unsatisfied

□ Not involved

OSPF virtual link

Run the display ospf vlink command.

The value of the neighbor status "State" should be "Full."

□ Satisfied

□ Unsatisfied

□ Not involved

OSPF STUB area

Run the display current-configuration configuration ospf command.

You cannot import routes in Import mode in a stub area.

□ Satisfied

□ Unsatisfied

□ Not involved

Advertising BGP routes

Run the display current-configuration configuration bgp command.

  • You are not advised to run the import-route protocol command to advertise IP routes.

  • Run the network { ipv4-address | ipv6-address prefix-length and ip route-static ip-address { mask | mask-length } null0 commands to aggregate routes manually, and then advertise the routes.

□ Satisfied

□ Unsatisfied

□ Not involved

IBGP peers

Run the display current-configuration configuration bgp command.

  • To keep the protocol stability, you are advised to set up peer relationship by using Loopback interfaces, which are always Up.

□ Satisfied

□ Unsatisfied

□ Not involved

L3VPN

VPN routes

Run the display ip routing-table vpn-instance vpn-instance-name command.

Check whether routes destined for the peer CE exist.

□Satisfied

□Unsatisfied

□Not involved

Routing attribute sent or received by a VPN instance

Run the display ip vpn-instance verbose command.

Export VPN Targets and Import VPN Targets should be configured correctly.

□Satisfied

□Unsatisfied

□Not involved

WLAN

AP

Run the display ap command.

"State" is displayed as "Normal".

□Satisfied

□Unsatisfied

□Not involved

Translation
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Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 449272

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