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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).
After a Huawei AR2220 Router Replaces an H3C MSR 3016 Router, Its Serial Interface Is Down

After a Huawei AR2220 Router Replaces an H3C MSR 3016 Router, Its Serial Interface Is Down

Keywords

Router, replacement, MSR, serial interface, Down

Abstract

After a Huawei AR2220 router replaces an H3C MSR 3016 router, its serial interface is Down.

Problem Description

After a Huawei AR2220 router replaces an H3C MSR 3016 router, the physical layer status and protocol layer status of its serial interface are Down.

Alarm

Remove the cable from the H3C MSR 3016 router and connect it to the Huawei AR2220 router. Run the display interface brief command on the Huawei AR2220 router. The command output shows that both the physical layer status and protocol layer status of the serial interface are Down.

<Huawei> display interface brief 
PHY: Physical 
*down: administratively down 
(l): loopback 
(s): spoofing 
(b): BFD down 
^down: standby 
(e): ETHOAM down 
InUti/OutUti: input utility/output utility 
Interface                   PHY   Protocol  InUti OutUti   inErrors  outErrors 
Cellular0/0/0               down  down         0%     0%          0          0 
Cellular0/0/1               down  down         0%     0%          0          0 
GigabitEthernet0/0/0        down  down         0%     0%          0          0 
GigabitEthernet0/0/1        up    up        0.01%  0.01%          0          0 
GigabitEthernet0/0/2        down  down         0%     0%          0          0 
LoopBack1                   up    up(s)        0%     0%          0          0 
NULL0                       up    up(s)        0%     0%          0          0 
Serial4/0/0                 down  down         0%     0%          0          0 
Serial4/0/1                 down  down         0%     0%          0          0 
Serial4/0/2                 down  down         0%     0%          0          0 
Serial4/0/3                 down  down         0%     0%          0          0 
Serial5/0/0                 down  down         0%     0%          0          0 
Serial5/0/1                 down  down         0%     0%          0          0 
Serial5/0/2                 down  down         0%     0%          0          0 
Serial5/0/3                 down  down         0%     0%          0          0 
Serial6/0/0                 down  down         0%     0%          0          0 
Serial6/0/1                 down  down         0%     0%          0          0 
Serial6/0/2                 down  down         0%     0%          0          0 

Procedure

  1. Check whether the cable works properly.

    Remove the cable from the Huawei AR2220 router and connect it to the H3C MSR 3016 router. Run the display interface brief command on the H3C MSR 3016 router. The command output shows that the serial interface of the H3C MSR 3016 router is Up and communicates with the remote interface properly. Therefore, the cable works properly.

  2. Check whether the card on the Huawei AR2220 router works properly.

    Check the card status. The card works properly. After the card is removed from the slot and installed into another slot, the serial interface is still Down.

  3. Check whether the configuration is correct.

    Compare the configuration of the H3C MSR 3016 router with that of the Huawei AR2220 router.

    H3C:

    interface Serial5/0:0 
     description TO ShenZhenFenBu PDC53289887G 
     link-protocol ppp 
     firewall packet-filter 3010 inbound 
     ip address 10.65.252.2 255.255.255.252 

    Huawei:

    # 
    interface Serial4/0/0 
     link-protocol ppp 
     description TO ShenZhenFenBu PDC53289887G 
     ip address 10.65.252.2 255.255.255.252 
     traffic-filter inbound acl 3010 
    #

    The comparison result shows that the configuration of the Huawei AR2220 router is correct and is the same as that of the H3C MSR 3016 router, but the serial interfaces of the two routers work in different modes.

    • The serial interface of the H3C MSR 3016 router is Serial5/0:0, indicating that the CE1/PRI interface works in E1 mode. In this mode, the CE1/PRI interface works at the rate of 2.048 Mbit/s without timeslot division.
    • The serial interface of the Huawei AR2220 router is Serial4/0/0, indicating that the E1-F interface works in framed mode by default. In this mode, the E1-F interface works at the rate of N x 64 kbit/s (N is the number of timeslots bundled into a channel) and its transmission line is divided into 32 timeslots. The default rate of the E1-F interface in framed mode is 1.984 Mbit/s.

  4. In the serial interface view of the Huawei AR2220 router, configure the E1-F interface to work in unframed mode. In this mode, the E1-F interface works at the rate of 2.048 Mbit/s without timeslot division.

    <Huawei> system-view
    [Huawei] interface serial 4/0/0
    [Huawei-Serial4/0/0] fe1 unframed

    After the configuration is complete, the serial interface of the Huawei AR2220 router is Up and communicates with the remote interface properly.

Root Cause

The serial interfaces of the H3C MSR 3016 router and Huawei AR2220 router work in different modes. Therefore, after the Huawei AR2220 router replaces the H3C MSR 3016 router, its serial interface is Down and fails to communicate with the remote interface.

Suggestion

When replacing an H3C router with a Huawei router or connecting a CE1/PRI interface to an E1-F interface, make sure that the CE1/PRI interface and E1-F interface work in the same mode.

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Updated: 2019-05-10

Document ID: EDOC1000079719

Views: 456587

Downloads: 4321

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