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Routing & Switching · Foundational

Hot Standby Router Protocol (HSRP)

Cisco-proprietary FHRP with one active and one standby router sharing a virtual IP and MAC address.

Definition

HSRPv1 uses multicast 224.0.0.2 and virtual MAC 0000.0c07.acXX with groups 0-255. HSRPv2 uses 224.0.0.102, virtual MAC 0000.0c9f.fXXX, groups 0-4095 and supports IPv6. Highest priority (default 100) wins, then highest IP. Hello 3 s and hold 10 s by default.

Example

standby 10 ip 10.10.10.1 / standby 10 priority 110 / standby 10 preempt

Exam tip

Preemption is disabled by default; without it, a higher-priority router will not take back the active role.

Don't confuse it with

Related terms