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Difference Between HSRP, VRRP and GLBP Protocols

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Difference Between HSRP, VRRP and GLBP Protocols

Difference Between HSRP, VRRP and GLBP Protocols

Protocol Features HSRP VRRP GLBP
Scope Cisco Proprietary IEEE Standard Cisco Proprietary
Standard RFC 2281 RFC 3768 None
OSI Layer Layer 3 Layer 3 Layer 2
Load Balancing No No Yes
Multicast Group IP Address 224.0.0.2 in v1
224.0.0.102 in v2
224.0.0.18 224.0.0.102
Transport Port Number UDP 1985 UDP 112 UDP 3222
Timers Hello 3 sec Advertisement 1 sec Hello 3 sec
Hold 10 sec Master down Time=3xAdvertisement Time+Skew Time(Skew Time)(256-Priority)/256 Hold 10 sec
Election Active Router:
1. Highest Priority
2. Highest IP (tie breaker)
Master Router: (*)
1. Highest Priority
2. Highest IP
(tie breaker)
Active Virtual Gateway:
1. Highest Priority
2. Highest IP (tie breaker)
Router Role 1. One Active Router, One Standby Router
2. One or more Listening Routers
1. One Active Router
2. One or More Backup Routers
1. One AVG (Active Virtual Gateway)
2. Up to 4 AVF Routers on the group (Active Virtual Forwarder) passing traffic.
3. Up to 1024 virtual Routers (GLBP groups) per physical interface.
Preempt If Active Router(Highest Priority) is down and up again, Preempt should be configured to become a Active Router again By default Preempt is ON in VRRP, If Active Router is down and up again, It will automatically become a Master Router If Active Router(Highest Priority) is down and up again, Preempt should be configured to become a Active Router again
Group Virtual Mac Address 0000.0c07.acxx 0000.5e00.01xx 0007.b4xx.xxxx
IPv6 Support Yes No Yes
Tracking Yes Yes Yes
Time Adjustments Yes Yes Yes

* If the group VRRP Virtual IP on the master (higher priority) is the real IP configured on a different VRRP (Backup with lower priority) IOS will manage to make the VRRP router with the real IP, the master, by setting its priority to 255, knowing that the configurable range is [1-254].

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