Enabling Arp Entry Backup - HPE FlexNetwork HSR6800 series Configuration Manual

Step
2. Enter the specified interface
view.
3. Configure VF tracking.

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. Hewlett Packard Enterprise 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:
Step
1. Enter system view.
2. Enter the specified interface
view.
3. Enable ARP entry backup for
the specified IPv4 VRRP
group.
Command
interface interface-type
interface-number
•
Configure the VF tracking
function to monitor a
specified track entry and
specify the value by which
the weight decreases:
vrrp vrid virtual-router-id
weight track
track-entry-number
[ reduced weight-reduced ]
•
Configure the VF tracking
function to monitor an AVF
on a specified router:
vrrp vrid virtual-router-id
track track-entry-number
forwarder-switchover
member-ip ip-address
Command
system-view
interface interface-type
interface-number
vrrp vrid virtual-router-id
backup-arp
149
Remarks
N/A
Use either method.
The VF tracking function is not
configured by default.
Remarks
N/A
N/A
By default, ARP entry backup is
disabled.