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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 AR Router Fails to Set Up a BGP Connection with a Non-Huawei Device

An AR Router Fails to Set Up a BGP Connection with a Non-Huawei Device


AR router, non-Huawei device, BGP connection, failure


BGP has been configured on an AR router. After the AR router restarts, it cannot set up a BGP connection with a non-Huawei device.

Problem Description

Version: V200R005C20SPC200

Networking: An AR161 connects to a non-Huawei device through a switch and needs to set up a BGP connection with the non-Huawei device.

Figure 19-25 An AR Router Fails to Set Up a BGP Connection with a Non-Huawei Device

AR161 configuration file:

ip vpn-instance MGMT
ip vpn-instance VPN1
 route-distinguisher 64512:201
interface Vlanif21
 ip binding vpn-instance VPN1
 ip address
 dhcp select interface
 dhcp server excluded-ip-address
 dhcp server dns-list 
interface GigabitEthernet0/0/0
interface GigabitEthernet0/0/1
interface GigabitEthernet0/0/2
 port hybrid pvid vlan 21
 port hybrid tagged vlan 22 to 25
 port hybrid untagged vlan 21
 undo lldp enable 
interface GigabitEthernet0/0/3 
 undo lldp enable 
interface GigabitEthernet0/0/4
 ip binding vpn-instance MGMT
 ip address
 combo-port auto 
interface GigabitEthernet0/0/4.201
 dot1q termination vid 201
 ip binding vpn-instance VPN1
 ip address 83.x.x.1 
interface Cellular0/0/0
bgp 64512
 timer keepalive 10 hold 70 
ipv4-family unicast
 undo synchronization 
ipv4-family vpn-instance VPN1
 default-route imported import-route direct
 import-route static peer 83.x.x.0 as-number 39651
 peer 83.x.x.0 ebgp-max-hop 2
 peer 83.x.x.0 connect-interface GigabitEthernet0/0/4.201
 peer 83.x.x.0 password cipher @%@%k]7J;SbeIMzF>}B8O+}<wB4)@%@% peer 151.x.x.1 as-number 39651
 peer 151.x.x.1 ebgp-max-hop 2 peer 151.x.x.1 connect-interface Virtual-Template3
 peer 151.x.x.1 password cipher @%@%f`IJGC%G<"j:aLBx2%&YwBEw@%@% # 
ip route-static vpn-instance MGMT 172.x.x.33 track nqa WAN WAN 
ip route-static vpn-instance MGMT

Fault symptom: The AR161 fails to set up a BGP connection with the non-Huawei device after restarting.

Troubleshooting Procedure

  1. Check whether the AR router configuration is lost after the router restarts.

    No problem is found after the BGP configuration is analyzed.

  2. Run the display diagnostic-information command in the diagnostic view to check device information.

    The command output shows a socket error log: OutBuffer Not available. The error log has been confirmed as a known error, which will not affect the BGP connection setup and can be ignored.

  3. Check debugging information about the TCP and BGP modules during system startup to analyze the BGP startup process.

    The AR161 can set up a TCP connection with the peer device, indicating that the link between them is working properly.

  4. Create a loopback interface on the AR161 and configure an IP address for the loopback interface. After the interface has been created, the BGP connection can be set up, and the fault is rectified.

    Compare session information generated before and after a BGP connection is set up. When the BGP connection fails to be set up, the BGP local router ID is When the BGP connection is set up, the BGP local router ID is the loopback interface IP address, as shown in the following command output.

    <Huawei> display bgp vpnv4 vpn-instance VPN1 peer 
    BGP local router ID : 
    Local AS number : 64512 
    VPN-Instance VPN1, router ID
    Total number of peers : 1  Peers in established state : 1 
    Peer  V AS  MsgRcvd  MsgSent  OutQ  Up/Down  State  PrefRcv 4 39651  10  22  0  02:59:49  Established  1

Root Cause

The router ID is invalid on a device. After the local CR timer expires, the AR161 does not initiate a TCP connection when detecting that the local router ID is 0. When the peer device finds that the router ID of the AR161 is 0, it terminates the BGP connection.


Perform either of the following operations on the AR161:

  • Run the router id router-id command to configure a global router ID.
  • Run the interface loopback loopback-number command to create a loopback interface and configure an IP address for the interface.


When configuring BGP, set the router ID first to prevent the situation that no interface IP address is available by default.

Updated: 2019-08-09

Document ID: EDOC1000079719

Views: 490823

Downloads: 4514

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