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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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Configuring ARP Active Detection

Configuring ARP Active Detection


As shown in Figure 2-18, VM1 and VM2 servers, which are on the same network segment and cannot send ARP packets actively, are connected to DeviceA and DeviceB gateways, respectively. The gateway addresses of DeviceA and DeviceB are the same. DeviceA and DeviceB will advertise routes of the network segment to DeviceC, which considers there are two equal-cost routes to VM1 and VM2. When a packet goes from DeviceC to VM1 passing through DeviceB, because there is no VM1's ARP information on DeviceB, the packet will be discarded. ARP active detection can be enabled on DeviceA and DeviceB so that devices can actively learn ARP information of servers connected to them. Then, you can run the arp direct-route enable (system view) or the arp direct-route enable (interface view) command on DeviceA and DeviceB to convert the learned ARP information into the Vlink host routes and advertise them to DeviceC. In this way, DeviceC can forward the packet along the correct path.
Figure 2-18 ARP active detection networking

The CE12800E configured with ED-E, EG-E, and EGA-E series cards does not support this function.


  1. Run system-view

    The system view is displayed.

  2. (Optional) Run arp smart-discover interval interval count count

    The interval at which the device sends ARP probe packets and the number of ARP probe packets sent in each interval are set.

    By default, the interval at which a device sends ARP probe packets is 1s and the number of ARP probe packets sent in each interval is 128.

  3. Run interface vlanif vlan-id

    The VLANIF interface view is displayed.

  4. Run arp smart-discover enable

    ARP active detection is enabled.

    By default, ARP active detection is disabled.

  5. Run commit

    The configuration is committed.

Follow-up Procedure

Run the arp direct-route enable (system view) or the arp direct-route enable (interface view) command to configure devices to advertise ARP Vlink direct routes.

Updated: 2019-04-18

Document ID: EDOC1100039535

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