Back Hot Standby Router Protocol German HSRP Spanish Hot Standby Router Protocol French Hot Standby Router Protocol Italian Hot Standby Router Protocol Japanese HSRP Mongolian HSRP Russian Hot Standby Router Protocol Swedish HSRP Ukrainian 熱備份路由器協定 Chinese
In computer networking, the Hot Standby Router Protocol (HSRP) is a Cisco proprietary redundancy protocol for establishing a fault-tolerant default gateway. Version 1 of the protocol was described in RFC 2281 in 1998. Version 2 of the protocol includes improvements and supports IPv6 but there is no corresponding RFC published for this version.
The protocol establishes an association between gateways in order to achieve default gateway failover if the primary gateway becomes inaccessible. HSRP gateways send multicast hello messages to other gateways to notify them of their priorities (which gateway is preferred) and current status (active or standby).
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