R3303-HP HSR6800 Routers High Availability Configuration Guide

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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
Command Remarks
1. Enter system view.
system-view N/A
2. Enter the specified interface
view.
interface interface-type
interface-number
N/A
3. Enable ARP entry backup for
the specified IPv4 VRRP
group.
vrrp vrid virtual-router-id
backup-arp
By default, ARP entry backup is
disabled.
Configuring VRRP packet attributes
Configuration prerequisites
Before you configure the relevant attributes of VRRP packets, create a VRRP group and configure a virtual
IP address for it.
Configuration guidelines
• You might configure different authentication modes and authentication keys for the VRRP groups on
an interface. However, the members of the same VRRP group must use the same authentication
mode and authentication key.
• Excessive traffic might cause a backup to trigger a change of its status because the backup does not
receive any VRRP advertisements for a specified period of time. To solve this problem, increase the
time interval to send VRRP advertisements.
• Configuring different intervals for sending VRRP advertisements on the routers in a VRRP group
might cause a backup to trigger a change of its status. This is because the backup does not receive
any VRRP advertisements for a specified period of time. To solve this problem, configure the same
interval for sending VRRP advertisements on each router in the VRRP group.
• After you specify an interface as the source interface for sending VRRP packets, this interface,
instead of the interface where the VRRP group resides, sends and receives VRRP packets. If you