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Friday, September 14, 2012

Comparison and Difference between HSRP, VRRP and GLBP Protocols


HSRP, VRRP and GLBP are the main three first hop redundancy protocols. In order to take the right decision for your network you should know the basics regarding all three.

The following chart provides difference HSRP Vs VRRP Vs GLBP protocols.

Difference between HSRP, VRRP and GLBP Protocols

Protocol FeaturesHSRPVRRPGLBP
ScopeCisco ProprietaryIEEE standardCisco proprietary
StandardRFC2281RFC3768none
OSI LayerLayer-3Layer-3Layer-2
Load BalancingNoNoYes
Multicast Group IP address224.0.0.2 in version 1224.0.0.102 in version 2224.0.0.18224.0.0.102
Transport Port NumberUDP 1985UDP 112UDP 3222
TimersHello – 3 secAdvertisement – 1 secHello – 3sec
Hold – 10 secMaster down time = 3*Advertisement Time + Skew TimeSkew Time = (256- Priority)/256Hold – 10sec
ElectionActive Router:1.Highest Priority2. Highest IP address (Tiebreaker)Master Router: (*)
1-Highest Priority
2-Highest IP (Tiebreaker)
Active Virtual Gateway:
1-Highest Priority
2-Highest IP (Tiebreaker)
Router Role-One Active Router, one Standby Router-one or more listening Routers- One Active Router- One or More Backup Routers- 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.
PreemptIf 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 RouterIf Active Router(Highest Priority) is down and up again, Preempt should be configured to become a Active Router again.
Group Virtual Mac Address0000.0c07.acxx0000.5e00.01xx0007.b4xx.xxxx
IPv6 supportYesNoYes


Note: In VRRP group, Router which is configured group as a real IP will become a Active Router, 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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