VRRPv3 protocol
Virtual Router Redundancy Protocol version 3 (VRRPv3) protocol is a network protocol that:
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provides redundancy for default gateway devices,
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supports IPv4 and IPv6 address families, and
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enables load sharing among multiple devices.
VRRPv3 benefits
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IPv4 and IPv6 support: It supports both IPv4 and IPv6 address families, unlike VRRPv2 which supports only IPv4.
Note
When VRRPv3 is in use, VRRPv2 is unavailable. For VRRPv3 to be configurable, the fhrp version vrrpv3 command must be used in global configuration mode.
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Network redundancy: Configures multiple devices as default gateways, eliminating single points of failure in a network.
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Traffic load sharing: Distributes traffic from LAN clients across multiple devices for equitable load distribution.
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Multiple virtual devices: It supports up to 255 virtual devices (VRRP groups) per physical interface, enabling extensive redundancy and load sharing in your LAN topology. In scaled environments, VRRS Pathways should be used in combination with VRRP control groups.
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Multiple IP address management: It manages multiple IP addresses, including secondary addresses, allowing VRRP configuration on each subnet.
Note
To utilize secondary IP addresses in a VRRP group, a primary address must be configured on the same group.
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Device preemption: It allows a higher-priority backup device to take over as primary from a lower-priority device.
Note
Preemption of a lower priority primary device is enabled with an optional delay.
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Standard advertisement protocol: It uses dedicated IANA standard multicast addresses (224.0.0.18 for IPv4, FF02:0:0:0:0:0:0:12 for IPv6) for advertisements, minimizing network overhead and enabling accurate identification of VRRP packets. The IANA has assigned VRRP the IP protocol number 112.