HSRP

Hot Standby Router Protocol

  • Cisco proprietary

  • An active and standby router is elected.

  • There are two versions: version 1 and version 2. Version 2 adds IPv6 support and increases the number of groups that can be configured.

  • Multicast IPv4 address:

    • v1 = 224.0.0.2

    • v2 = 224.0.0.102

  • Virtual MAC address:

    • v1 = 0000.0c07.acXX (XX = HSRP group number)

    • v2 = 0000.0c9f.fXXX (XXX = HSRP group number)

  • In a situation with multiple subnets/VLANs, you can configure a different active router in each subnet/VLAN to load balance.

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