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NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services 01

This is NE20E-S2 V800R010C10SPC500 Configuration Guide - IP Services
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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).
Configuring Association Between ARP and Interface Status

Configuring Association Between ARP and Interface Status

Association between ARP and interface status allows the local device to check whether the peer device is able to properly forward packets.

Background

To minimize the impact of device faults on services and improve network availability, a network device must be able to quickly detect communication faults of devices that are not directly connected. Then, measures can be taken to quickly rectify the faults to ensure the normal running of services.

Association between ARP and interface status allows the local interface to send ARP probe packets to the peer interface and checks whether the peer interface can properly forward packets based on whether a reply packet is received. This triggers fast route convergence.

Pre-configuration Tasks

Before configuring association between ARP and interface status, complete the following tasks:
  • Configure physical parameters of the interface and ensure that the interface is physically Up.

  • Configure the link layer protocol parameters and IP addresses for the interface.

Procedure

  1. Run system-view The system view is displayed.

  2. Run interface interface-type interface-number The view of the interface on which ARP and interface status needs to be enabled is displayed.

  3. Run ip address ip-address { mask | mask-length } [ sub ] The IP address of the interface is configured.

  4. Run arp status-detect ip-address Association between ARP and interface status is enabled.

    NOTE:

    The destination IP address of ARP probe messages must be on the same network segment as the IP address of the local interface. The probed device does not need to be configured.

  5. (Optional) Run arp status-detect mode loose The interface is configured to send ARP probe messages in loose mode.

    • In strict mode, an interface sends ARP probe messages when the physical status is Up. The protocol status of the local interface remains unchanged only when the local interface receives an ARP reply packet from the peer interface and the source IP address of the ARP reply packet is the same as the destination IP address of the ARP probe packet. If no ARP reply packet is received from the peer interface within the allowable attempts, the protocol status of the local interface is set to Down.
    • In loose mode, an interface sends ARP probe messages only when both the physical status and protocol status are Up. The protocol status of the local interface remains unchanged only when the local interface receives an ARP packet from the peer interface and the source IP address of the ARP packet is the same as the destination IP address of the ARP probe packet. If no ARP packet is received from the peer interface within the allowable attempts, the protocol status of the local interface is set to Down.
    NOTE:

    If association between ARP and interface status is configured on devices at both ends, you are advised to configure at lease the device at one side to work in strict mode. Do not configure devices at both ends to send ARP probe messages in loose mode.

  6. (Optional) Run arp status-detect interval detect-interval The interval at which ARP probe messages are sent has been configured.

    Set the interval at which ARP probe messages are sent to a large value to prevent interface flapping upon operations such as primary/secondary switching.

  7. (Optional) Run arp status-detect times detect-times The maximum number of times that an interface can consecutively send ARP probe messages has been configured.

    Set the maximum number of times an interface can consecutively send ARP probe messages to a large value to prevent interface flapping upon operations such as primary/secondary switching.

  8. Run commit The configuration is committed.

Verifying the Configuration of Association Between ARP and Interface Status

Run the display interface [ interface-type [ interface-number ] ] command to check the status information and statistics of the interface.

<HUAWEI> display interface gigabitethernet 0/1/1
GigabitEthernet0/1/1 current state : UP (ifindex: 9)
Line protocol current state : UP 
Link quality grade : GOOD
Description: 
Route Port,The Maximum Transmit Unit is 1500 
Internet Address is 10.1.1.1/24
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 3892-6c21-0302
Loopback:none, LAN full-duplex mode, Pause Flowcontrol: Receive Enable and Send Enable
Last physical up time   : 2018-01-24 12:03:24
Last physical down time : 2018-01-24 11:40:45
Current system time: 2018-01-24 12:06:25
Statistics last cleared:never
    Last 300 seconds input rate: 0 bits/sec, 0 packets/sec
    Last 300 seconds output rate: 0 bits/sec, 0 packets/sec
    Input peak rate 0 bits/sec, Record time: -
    Output peak rate 0 bits/sec, Record time: -
    Input: 0 bytes, 1354 packets
    Output: 0 bytes, 1370 packets
    Input: 
      Unicast: 64 packets, Multicast: 91 packets
      Broadcast: 1199 packets, JumboOctets: 0 packets
      CRC: 0 packets, Symbol: 0 packets
      Overrun: 0 packets, InRangeLength: 0 packets
      LongPacket: 0 packets, Jabber: 0 packets, Alignment: 0 packets
      Fragment: 0 packets, Undersized Frame: 0 packets
      RxPause: 0 packets
    Output:
      Unicast: 12 packets, Multicast: 90 packets
      Broadcast: 1268 packets, JumboOctets: 0 packets
      Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets
      System: 0 packets, Overruns: 0 packets
      TxPause: 0 packets
    Last 300 seconds input utility rate:  0.00%
    Last 300 seconds output utility rate: 0.00%
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Updated: 2019-01-02

Document ID: EDOC1100055376

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