# HSRP

* 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.ac**XX** (**XX** = HSRP group number)
  * v2 = 0000.0c9f.f**XXX** (**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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