FHRP - Comparison Table

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

Feature/Protocol	Hot Standby Router Protocol (HSRP)	Virtual Router Redundancy Protocol (VRRP)	Gateway Load Balancing Protocol (GLBP)
Standardization	Proprietary (Cisco)	Open Standard (IETF RFC 5798)	Proprietary (Cisco)
Primary Function	Provides redundancy (and load balancing on Nexus devices)	Provides redundancy	Provides redundancy and load balancing
Number of Active Routers	1 active, 1 or more standby	1 active, 1 or more standby	Multiple active routers (load balancing)
Preemption Support	Yes	Yes	Yes
Load Balancing	No (Nexus yes)	No	Yes (via multiple active routers)
Authentication Support	Yes	Yes	Yes
Default Timers	3 seconds hello, 10 seconds hold	1 second hello, 3 seconds hold	3 seconds hello, 10 seconds hold
Priority Configuration	Yes	Yes	Yes
IPv6 Support	Yes	Yes	Yes
Proprietary/Standard	Proprietary	Standard	Proprietary
Protocol Number	N/A (Uses multicast 224.0.0.2)	112	N/A (Uses multicast 224.0.0.102)
Election Process	Highest priority (or IP address tie-breaker)	Highest priority (or IP address tie-breaker)	Highest weighting for AVG role
Versions Available	Version 1, Version 2	Version 2, Version 3	Version 1
Number of Groups/IDs	v1: 255, v2: 4096	v2: 255, v3:4096	1024

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