No relevant resource is found in the selected language.

This site uses cookies. By continuing to browse the site you are agreeing to our use of cookies. Read our privacy policy>Search

Reminder

To have a better experience, please upgrade your IE browser.

upgrade

CLI-based Configuration Guide - IP Service

AR100, AR120, AR160, AR1200, AR2200, AR3200, and AR3600 V300R003

This document describes the concepts and configuration procedures of IP Service features on the device, and provides the configuration examples.
Rate and give feedback:
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).
Adjusting Aging Parameters of Dynamic ARP Entries

Adjusting Aging Parameters of Dynamic ARP Entries

Properly adjusting aging parameters of dynamic ARP entries can improve network reliability. Aging and updating of dynamic ARP entries will be affected if the device is enabled to perform Layer 2 topology detection, respond to TC BPDUs, or delete dynamic ARP entries after a delay.

Context

You can adjust the following aging parameters of dynamic ARP entries:
  • Aging time of dynamic ARP entries: the aging time of a dynamic ARP entry is reached, the device sends an ARP Request packet to the mapping outbound interface and starts ARP aging probing. If the aging time is too short (for example, 1 minute), the device consumes most resources on updating dynamic ARP entries and cannot process other services. If the aging time is too long (for example, 15 hours), the device may not update dynamic ARP entries in a timely manner. The default aging time (20 minutes) is recommended.

  • Number of aging probes to dynamic ARP entries: Before aging a dynamic ARP entry, the device sends probes to detect status of the entry. If the device receives no response for updating the entry after the specified number of probes, the device deletes the ARP entry.

  • Aging detection mode of dynamic ARP entries: Before an ARP entry is aged, an interface sends an ARP aging probe packet.

    NOTE:
    • If the IP address of the peer device remains the same but the MAC address changes frequently, it is recommended that you configure ARP aging probe packets to be broadcast.
    • If the MAC address of the peer device remains the same, and the network bandwidth is insufficient, it is recommended that you configure ARP aging probe packets to be unicast.

Aging and updating of dynamic ARP entries is also affected if the device is enabled to perform Layer 2 topology detection, respond to TC BPDUs, or delete dynamic ARP entries after a delay.

Procedure

  • Adjusting aging parameters of dynamic ARP entries

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. Run arp expire-time expire-time

      The aging time of dynamic ARP entries is set.

      By default, the aging time of dynamic ARP entries is 1200 seconds, that is, 20 minutes.

    4. Run arp detect-times detect-times

      The number of probes to dynamic ARP entries is set.

      By default, the number of ARP probes is 3.

    5. Run arp detect-mode unicast

      An interface is configured to send ARP aging probe packets in unicast mode.

      By default, an interface sends the last ARP Aging Detection packet in broadcast mode, and the rest ARP Aging Detection packets are sent in unicast mode.

  • Configuring the functions that affect dynamic ARP entry update (in special scenarios)

    Enabling Layer 2 topology detection

    If no STP protocol is configured on a ring network (for example, STP is not required if the device can determine the master and backup links), Layer 2 topology detection can be enabled to ensure real-time update of dynamic ARP entries.

    Layer 2 topology detection enables the system to update all the ARP entries in the VLAN that a Layer 2 interface belongs to when the Layer 2 interface status changes from Down to Up.

    1. Run system-view

      The system view is displayed.

    2. Run l2-topology detect enable

      Layer 2 topology detection is enabled.

      By default, Layer 2 topology detection is disabled.

Verifying the Configuration

Run the display current-configuration | include arp command to check the aging parameter settings of dynamic ARP entries.

Translation
Download
Updated: 2019-03-06

Document ID: EDOC1100069333

Views: 33741

Downloads: 169

Average rating:
This Document Applies to these Products
Related Version
Related Documents
Share
Previous Next