Difference between revisions of "Hot Standby Router Protocol"
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*GLBP [[Gateway Load Balancing Protocol]] | *GLBP [[Gateway Load Balancing Protocol]] | ||
*VRRP [[Virtual Router Redundancy Protocol]] | *VRRP [[Virtual Router Redundancy Protocol]] | ||
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= How does HSRP work = | = How does HSRP work = | ||
HSRP works by two or more Routers agreeing upon which Router serves the ''virtual Router''. | HSRP works by two or more Routers agreeing upon which Router serves the ''virtual Router''. | ||
== The Virtual Router == | == The Virtual Router == | ||
| − | + | The Virtual Router is a MAC-address and a IP Address the ''active'' Router serves beside its configured IP address. If the ''active'' Router fails one of the ''standby'' Routers becomes the Virtual Router by serving the virtual MAC-address and IP Address. | |
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== HSRP example == | == HSRP example == | ||
In picture 1 three Routers R1,R2 and R3 are setup in a HSRP Group. The Virtual IP address 10.0.0.1 and virtual MAC-Address 00-10-0C-07-AC-0A are served by the active Router R1. R1 continuesly transmits hello packets to the standby Routers.<br/> | In picture 1 three Routers R1,R2 and R3 are setup in a HSRP Group. The Virtual IP address 10.0.0.1 and virtual MAC-Address 00-10-0C-07-AC-0A are served by the active Router R1. R1 continuesly transmits hello packets to the standby Routers.<br/> | ||
| − | If the Active Router fails one of the ''standby'' Routers will become the active Router and start serving the Virtual IP address 10.0.0.1 and the virtual MAC-address 00-10-0C-07-AC-0A. | + | If the Active Router fails one of the ''standby'' Routers will become the active Router and start serving the Virtual IP address 10.0.0.1 and the virtual MAC-address 00-10-0C-07-AC-0A.<br/> |
| + | There are no load balancing between the Routers. | ||
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[[Image:HSRP1.png|thumb|500px|float|Picture 1: HSRP group with Router R1 active and Router R2 and R3 as standby Routers]] | [[Image:HSRP1.png|thumb|500px|float|Picture 1: HSRP group with Router R1 active and Router R2 and R3 as standby Routers]] | ||
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[[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]] | [[Category:Cisco]][[Category:CCNP]][[Category:IOS]][[Category:Network]][[Category:CCNP3]] | ||
Revision as of 08:38, 3 May 2009
HSRP or Hot Standby Router Protocol is a protocol defined by Cisco and now described in rfc2281.
Contents
Purpose of HSRP
The purpose of HSRP is to ensure network connectivity in case of Router or access circuit failure, by having one or more standby Router(s) waiting to take over from the failing active Router.
Other high availability Router protocols
How does HSRP workHSRP works by two or more Routers agreeing upon which Router serves the virtual Router. The Virtual RouterThe Virtual Router is a MAC-address and a IP Address the active Router serves beside its configured IP address. If the active Router fails one of the standby Routers becomes the Virtual Router by serving the virtual MAC-address and IP Address. HSRP exampleIn picture 1 three Routers R1,R2 and R3 are setup in a HSRP Group. The Virtual IP address 10.0.0.1 and virtual MAC-Address 00-10-0C-07-AC-0A are served by the active Router R1. R1 continuesly transmits hello packets to the standby Routers. |
