R3303-HP 6600/HSR6600 Routers High Availability Configuration Guide

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Task Remarks
Enabling ARP entry backup
After a master/backup switchover
occurs in a VRRP group, the new master
might need to learn ARP entries of the
hosts on the LAN, causing traffic
interruption.
The ARP entry backup function enables
the master to send the dynamic ARP
entries of hosts through VRRP
advertisements to other VRRP group
members. In this way, when a
master/backup switchover occurs, the
new master does not need to learn the
ARP entries again.
Configuration prerequisites
Before you enable the ARP entry
backup function, create a VRRP group
and configure a virtual IP address for it.
Configuration guidelines
• The ARP entry backup function is
supported on Layer 3 Ethernet
interfaces or subinterfaces.
• You can enable the ARP entry
backup function when VRRP
operates in either standard mode
or load balancing mode. Only the
master can initiate ARP entry
backup.
• Enable ARP entry backup on all
VRRP group members for the
function to take effect correctly.
• ARP entry backup affects VRRP
performance. HP recommends not
enabling the ARP entry backup
function for multiple VRRP groups.
• A VRRP group member might
need some time to back up ARP
entries before it becomes the new
master. To reserve enough ARP
entry backup time, configure a
proper preemption delay for the
VRRP group based on the number
of ARP entries.
Configuration procedure
To configure ARP entry backup:
Ste
p
Co
m
Optional.