FHRP - Comparison Table

The following table compares and contrasts the various capabilities and parameters of multiple First Hop Redundancy Protocols.

Feature/ProtocolHot Standby Router Protocol (HSRP)Virtual Router Redundancy Protocol (VRRP)Gateway Load Balancing Protocol (GLBP)
StandardizationProprietary (Cisco)Open Standard (IETF RFC 5798)Proprietary (Cisco)
Primary FunctionProvides redundancy (and load balancing on Nexus devices)Provides redundancyProvides redundancy and load balancing
Number of Active Routers1 active, 1 or more standby1 active, 1 or more standbyMultiple active routers (load balancing)
Preemption SupportYesYesYes
Load BalancingNo (Nexus yes)NoYes (via multiple active routers)
Authentication SupportYesYesYes
Default Timers3 seconds hello, 10 seconds hold1 second hello, 3 seconds hold3 seconds hello, 10 seconds hold
Priority ConfigurationYesYesYes
IPv6 SupportYesYesYes
Proprietary/StandardProprietaryStandardProprietary
Protocol NumberN/A (Uses multicast 224.0.0.2)112N/A (Uses multicast 224.0.0.102)
Election ProcessHighest priority (or IP address tie-breaker)Highest priority (or IP address tie-breaker)Highest weighting for AVG role
Versions AvailableVersion 1, Version 2Version 2, Version 3Version 1
Number of Groups/IDsv1: 255, v2: 4096v2: 255, v3:40961024

Links:

https://forum.networklessons.com/t/vrrp-virtual-router-redundancy-protocol/1151/89?u=lagapidis

https://networklessons.com/cisco/ccie-routing-switching/introduction-gateway-redundancy

https://networklessons.com/cisco/ccie-routing-switching/vrrp-virtual-router-redundancy-protocol

https://networklessons.com/cisco/ccie-routing-switching/hsrp-hot-standby-routing-protocol

https://networklessons.com/cisco/ccie-routing-switching/glbp-gateway-load-balancing-protocol

https://datatracker.ietf.org/doc/html/rfc5798

https://datatracker.ietf.org/doc/html/rfc3768