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Configuration Guide - IP Service

CloudEngine 12800 and 12800E V200R005C00

This document describes the configurations of IP Service, including IP address, ARP, DHCP, DNS, IP performance optimization, IPv6, DHCPv6, and IPv6 DNS.
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Adjusting Aging Parameters of Dynamic ARP Entries

Adjusting Aging Parameters of Dynamic ARP Entries

Context

Aging parameters of dynamic ARP entries include the aging time, the number of probes, detection intervals, and detection modes. Proper adjustment of aging parameters improves network reliability.

You can adjust the following aging parameters of dynamic ARP entries:
  • Aging time of dynamic ARP entries: Before the aging time of a dynamic ARP entry is reached, the device sends an ARP Request packet to the corresponding outbound interface and starts ARP aging detection.

  • Number of probes to dynamic ARP entries: Before aging a dynamic ARP entry, the system first performs probes. If no answer is received after the times of probes reach the upper limit, the ARP entry is deleted.

  • Detection interval for dynamic ARP entries: which is the interval for sending ARP probe packets.

    NOTE:

    If the value of the aging time is set too small (for example, 1 minute), the system consumes most resources on updating dynamic ARP entries, affecting the processing of other services.

  • Aging detection modes 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 parameters of dynamic ARP entries can be adjusted in the system view and interface view on the device.
  • If the parameters are configured in the system view, the configuration takes effect for dynamic ARP entries learned by all interfaces on the device.
  • If the parameters are configured both in the interface view of an interface and the system view, the configuration in the interface view takes effect for aging parameters of dynamic ARP entries learned by the interface.

Procedure

  • Adjust aging parameters of dynamic ARP entries in the system view.

    1. Run system-view

      The system view is displayed.

    2. Run arp timeout 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.

    3. 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.

    4. Run arp detect interval detect-interval

      The interval for sending ARP aging probe packets is set.

      By default, the interval for sending ARP aging probe packets is 5 seconds.

    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 probe packet in broadcast mode, and the rest ARP Aging Detection packets are sent in unicast mode.

    6. Run commit

      The configuration is committed.

  • Adjust aging parameters of dynamic ARP entries in the interface view.

    1. Run system-view

      The system view is displayed.

    2. Run interface interface-type interface-number

      The interface view is displayed.

    3. On an Ethernet interface, run undo portswitch

      The interface is switched to Layer 3 mode.

      By default, an Ethernet interface works in Layer 2 mode.

      The mode switching function takes effect when the interface only has attribute configurations (for example, shutdown and description configurations). Alternatively, if configuration information supported by both Layer 2 and Layer 3 interfaces exists (for example, mode lacp and lacp system-id configurations), no configuration that is not supported after the working mode of the interface is switched can exist. If unsupported configurations exist on the interface, delete the configurations first and then run the undo portswitch command.

      NOTE:

      If many Ethernet interfaces need to be switched to Layer 3 mode, run the undo portswitch batch interface-type { interface-number1 [ to interface-number2 ] } &<1-10> command in the system view to switch these interfaces to Layer 3 mode in batches.

    4. Run arp timeout 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.

    5. 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.

    6. Run arp detect interval detect-interval

      The interval for sending ARP aging probe packets is set.

      By default, the interval for sending ARP aging probe packets is 5 seconds.

    7. 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 probe packet in broadcast mode, and the rest ARP Aging Detection packets are sent in unicast mode.

    8. Run commit

      The configuration is committed.

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Updated: 2019-04-18

Document ID: EDOC1100039535

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