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RS0010 - GLBP

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The video demonstrates GLBP configuration on two routers providing an IP gateway. We review the roles of Active Virtual Gateway (AVG) and Active Virtual Forwarder (AVF), and how load balancing is achieved, and perform various failover test scenarios. GLBP main distinction from HSRP and VRRP is its ability to natively provide gateway load balancing to end devices, hence increase in protocol complexity.

Topic includes
  • Basic GLBP Configuration
  • GLBP priority and preempt
  • GLBP MD5 authentication
  • GLBP Interface Object Tracking
  • GLBP Load Balancing Method
  • AVG and AVF Failover
  • GLBP Packet Analysis
Quick Facts:
  • GLBP uses UDP/3222
  • GLBP default Hello interval is 3 seconds
  • GLBP has virtual MAC 0007.b4xx.xxyy with xx being group number and yy being forwarder number
  • GLBP allows up to 4 virtual MAC address per group
  • Elected Active Virtual Gateway (AVG) assigns/revokes virtual MAC to/from group members
  • Each gateway is an Active Virtual Forwarder (AVF) and answers own ARP request

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, Metha enjoys learning and challenges himself with new Cisco technologies.

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