HSRP, VRRP & GLBP

HSRP	GLBP	VRRP
Its Cisco proprietary	Its Cisco proprietary	IEEE Standard
No Load Balancing	Load Balancing	No Load Balancing
Work on Layer-3	Work on Layer-2	Work on layer-3
Its support IPv6	Its support IPv6	Its not support IPv6
Multicast IP address in version-1 is 224.0.0.2 & version-2 is 224.0.0.102	Multicast IP address-224.0.0.102	Multicast IP address 224.0.0.18
UDP-1985	UDP-3222	UDP-112
Election should be Highest IP & Highest Priority	Election should be Highest IP & Highest Priority	Election should be Highest IP & Highest Priority
One active router & one standby	One AVG (Active Virtual Gateway)- up to 4 AVF Routers on the group (Active Virtual Forwarder) passing traffic.- up to 1024 virtual Routers (GLBP groups) per physical interface.	One Active router & one or more backup router
If active router is down & come up again, Preempt should be configure on Active router	If active router is down & come up again, Preempt should be configure on Active router	By default Preempt is on, if active router is down & automatically is will be master
Virtual IP address	Virtual IP address	Real IP address