The Active Router handles all the workload as the default gateway of the LAN segment, the job of the Standby Router is to take over if the Active Router were to fail, all other Router Group members go into a “Listen” state where they do not send any Hellos but rather listen for them from the Active and Standby routers.
The HSRP group elects both an “Active Router and “Standby Router” from the group based first on highest Priority value, then by highest assigned IP Address on the network segment HSRP is configured on (SVI, 元 Interface, etc), a higher value being preferred for both the Priority and the configured IP Address while being elected.Įach instance of HSRP configured on a switch is referred to as a Router Group, the switches in these Router Groups are referred to as Router Group Members. HSRP is a Cisco proprietary protocol defined by RFC 2281, which allows for two or more switches to be configured to be part of an HSRP group, which form a single “Virtual Router” to provide High-Availability / Fault-Tolerant gateway redundancy for the LAN segment. Though there are two physical switches shown with local IP Addresses configured, these represent a single “Virtual Router” as seen by hosts on the LAN, with a single shared IP Address between both devices.įundamentals of Hot Standby Router Protocol (HSRP) / Operation explained
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