How does HSRP standby router react to an incoming packet?

[marwan.khoury]

Dear Cisco Community,

I am a bit confused about how does the standby router react to incoming packets.

Given the below:

R1 <--------------physical/logical connection----------------------->R2

|                                                                                     |

|                                                                                     |

|                                                                                     |

R3                                                                                 R4

R3 and R4 are in HSRP with R4 being standby.

First, is the HSRP traffic using the phsical/logica connection to communicate between R3 and R4 and should there be any specific configuration on R1 and R2?

Second, if R4 receives a incoming packet from another interface (external router for ex), does it forward it to R3 and R3 route accordingly or does R4 send the packet directly?

Thank you for your help

Regards,

[ebarticel]

Hi,

Have a look at this article. It is a better explanation than I can give you

http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/unicast/configuration/guide/l3_hsrp.html#wp1509247

Hope this helps

Eugen