Vrrp Load Balancing Mode - HPE FlexNetwork HSR6800 series Configuration Manual

Figure 38 VRRP in load sharing mode
A router can be in multiple VRRP groups and hold a different priority in a different group.
As shown in
VRRP group 1—Router A is the master. Router B and Router C are the backups.
VRRP group 2—Router B is the master. Router A and Router C are the backups.
VRRP group 3—Router C is the master. Router A and Router B are the backups.
For load sharing among Router A, Router B, and Router C, hosts on the LAN need to be
configured to use VRRP group 1, 2, and 3 as the default gateways, respectively. When
configuring VRRP priorities, make sure that each router holds such a priority in each VRRP
group so that it will take the expected role in the group.

VRRP load balancing mode

In a standard-mode VRRP group, only the master can forward packets. The backups are in listening
state. You can create multiple VRRP groups to share load, but you must assign different gateways to
the hosts on the LAN.
Load balancing mode simplifies configuration and improves forwarding efficiency. In load balancing
mode, a VRRP group maps its virtual IP address to multiple virtual MAC addresses: one virtual MAC
address for each group member. The master uses these virtual MAC addresses of the member
routers to respond to IPv4 ARP requests or IPv6 ND requests from hosts. Therefore, every router in
this VRRP group can forward traffic and traffic from hosts is distributed across the VRRP group
members.
VRRP load balancing mode uses the same master election, preemption, and tracking mechanisms
as the standard mode, and adds new mechanisms as described in the following sections.
Assigning virtual MAC addresses
In a load balanced VRRP group, the master assigns virtual MAC addresses to the member routers
and answers the ARP requests or ND requests from different hosts. The backup routers do not
answer the ARP requests or ND requests from the hosts.
In an IPv4 network, a load-balanced VRRP group works as follows:
Figure 38, the following VRRP groups are present:
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