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RS0008 - HSRP

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The video demonstrates HSRPv2 configuration on two routers providing an IP gateway. Failover behavior caused by interface object tracking is observed. We look into the HSRP packet and identify differences between having MD5 authentication enabled and disabled. HSRP provides redundancy at the first-hop gateway to end devices. Although load balancing is possible, multiple HSRP group and virtual IPs are needed.

Topic includes
  • Basic HSRPv2 Configuration
  • HSRP priority and preempt
  • HSRP MD5 authentication
  • HSRP Interface Object Tracking
  • HSRP Packet Analysis
Quick Facts:
  • HSRPv1 uses 224.0.0.2 UDP/1985, and HSRPv2 uses 224.0.0.102 UDP/1985 for Hello packets
  • HSRPv1 packet does not carry timeout value if configured in msec. HSRPv2 does.
  • HSRPv1 group number ranges from 0 to 255 with virtual MAC 0000.0C07.ACxx, with xx being group number
  • HSRPv2 group number ranges from 0 to 4095 with virtual MAC 0000.0C9F.Fxxx, with xxx being group number
  • HSRP default priority is 100

About Author

Metha Cheiwanichakorn, CCIE#23585 (RS, Sec, SP), is a Cisco networking enthusiast with years of experience in the industry. He is currently working as a consulting engineer for a Cisco partner. As a founder of and an instructor at labminutes.com, Metha enjoys learning and challenges himself with new Cisco technologies.

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