10.3. Hot Standby Router Protocol

The first protocol I want to go over is HSRP. This is a Cisco-proprietary protocol that can be run on most, but not all, Cisco router and multilayer switch models. HSRP defines a standby group each of the standby groups that you define include:

  • Active router

  • Standby router

  • Virtual router

  • Any other routers that maybe attached to the subnet

The standby group will always have two routers that are participating in the group. The primary players in the group are the one active router and one standby router that communicate to each other using multicast Hello messages. The Hello messages provide all of the required communication for the routers. The Hellos contain the information required to accomplish the election that ...

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