Enabling Enhanced Sending and Replication of Gratuitous ARP Packets for a VRRP Group

After enhanced sending and replication of gratuitous ARP packets is enabled for a VRRP group, when a backup device in the VRRP group assumes the master role, it sends a gratuitous ARP packet for each virtual IP address six consecutive times. At the same time, the device replicates each gratuitous ARP packet to be sent to each Eth-Trunk member interface if the VRRP group is configured on an Eth-Trunk interface or Eth-Trunk sub-interface. This ensures that downstream devices can receive the gratuitous ARP packets and update destination MAC addresses and outbound interfaces in time.

Context

When a backup device in a VRRP group assumes the master role, it sends a gratuitous ARP packet about each virtual IP address once by default. To ensure that downstream devices can receive the gratuitous ARP packets and update destination MAC addresses and outbound interfaces in time, enable enhanced sending of gratuitous ARP packets for the VRRP group. After this function is enabled, when a backup device in the VRRP group assumes the master role, it sends a gratuitous ARP packet for each virtual IP address six consecutive times.

In the scenario where a VRRP group is configured on an Eth-Trunk interface or Eth-Trunk sub-interface, when a backup device in the VRRP group assumes the master role, it sends a gratuitous ARP packet for each virtual IP address to only one Eth-Trunk member interface by default. To ensure that downstream devices can receive the gratuitous ARP packets in time and improve network convergence performance, enable replication of gratuitous ARP packets for the VRRP group. After this function is configured, when a backup device in the VRRP group assumes the master role, it replicates each gratuitous ARP packet to be sent to each Eth-Trunk member interface. This allows downstream devices to receive the gratuitous ARP packets and update entries in time, speeding up network convergence.

Procedure

Enable enhanced sending of gratuitous ARP packets for a VRRP group.
1. Run system-view
  The system view is displayed.
2. Run vrrp gratuitous-arp enhance enable
  Enhanced sending of gratuitous ARP packets is enabled for a VRRP group.
3. Run commit
  The configuration is committed.
Enable replication of gratuitous ARP packets for a VRRP group.
1. Run system-view
  The system view is displayed.
2. Run interface eth-trunk trunk-id [ .subnumber ]
  An Eth-Trunk interface or an Eth-Trunk sub-interface is created.
3. Run vrrp vrid virtual-router-id [ virtual-ip virtual-address ]
  A VRRP group is configured and a virtual IP address is configured for the VRRP group.
4. Run vrrp vrid virtual-router-id1 track admin-vrrp interface interface-type interface-number vrid virtual-router-id2 unflowdown
  The VRRP group is bound to an mVRRP group in unflowdown mode.
5. Run vrrp vrid virtual-router-id gratuitous-arp copy-to-member
  Replication of gratuitous ARP packets is enabled for the VRRP group.
6. Run commit
  The configuration is committed.

Verifying the Configuration

After configuring enhanced sending and replication of gratuitous ARP packets for a VRRP group, run the display vrrp [ [ interface interface-type interface-number [ virtual-router-id ] [ verbose | brief ] ] | brief ] command to check whether replication of gratuitous ARP packets is enabled for the VRRP group. Specifically, check whether enabled is displayed in the Arp Copy field of the command output.