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Hsrp cisco mac address 07ac how to#

As a result, the change count incremented and the timer reset: Core-1(config-if)#do sh standģ state changes, last state change 00:00:02 As we just saw, when we shut down Core-1’s FastEthernet0/0 interface it went from Active to Init. This tells us the last time Core-1’s HSRP state changed. Then we have this line: 2 state changes, last state change 00:00:09 (For more information on HSRP states, please refer to this page.) If we jump onto Core-2 we’ll see that it has now become the active gateway: Core-2(config-if)#do sh stand By shutting down this interface down we’ll see that it moves to an “Init” state instead: Core-1(config-if)#do show standby

This tells us that Core-1’s FastEthernet0/0 interface is currently being used to serve as the default gateway in group 10. Let’s now dissect what the above information is telling us and play around with a few settings to make sure we fully understand what the above output is telling us. Local virtual MAC address is 0a (v1 default)

Let’s take a look at what information the “ show standby” output tells us: Core-1(config-if)# do show standbyĢ state changes, last state change 00:00:09Īctive virtual MAC address is 0a

the preempt command has been enabled, this means that if Core-1 goes offline, it will automatically regain its HSRP Active state in Group 10 when it is back online.

Core-1 is the Active router due to its higher priority.

This configuration is quite straight forward, but let’s dissect it for the sake of completeness: To do this we’ll use the following topology: Network TopologyĪfter having read the aforementioned articles you will know that by using HSRP we’ll be able to configure Core-1 and Core-2 to share the default gateway IP address in an Active/Standby manner. To avoid reinventing the wheel, let’s delve deeper into HSRP’s workings.

First Hop Redundancy Protocols for CCNA.

Hsrp cisco mac address 07ac how to#

How to configure HSRP on a Cisco router.HSRP has been covered in few RouterFreak’s articles such as: If the primary gateway fails, HSRP automatically redirects hosts to the the backup gateway. Hot Standby Routing Protocol ( HSRP) is a Cisco proprietary default gateway redundancy protocol.