Some Notes
GLBP prioritizes gateways to elect an active virtual gateway (AVG). If gateways have the same priority, the gateway with the highest IP address is made the AVG. The AVG assigns a virtual MAC address to each member of the GLBP group. Load sharing is achieved when the AVG replies to ARP requests with different virtual MAC addresses. The MAC assignment is based on the load balancing scheme used. The AVG is redundant across the group with member in the active, standby or listen state. GLBP also has an active virtual forwarder (AVF). The AVF redundancy is similar to the AVG.
Load Balancing
- Round Robin - Cycles through the Virtual MAC addresses (default)
- Weighted - Higher weight means more traffic is directed to an AVF
- Host Dependent - Uses the host MAC address to determine the Virtual MAC address to use
Default Settings
Authentication No authentication
Extended hold timer 10 seconds
Forwarder preemption delay 30 seconds
Forwarder timeout 14400 seconds
Hello timer 3 seconds
Hold timer 10 seconds
GLBP feature Disabled
Load balancing Round robin
Preemption Disabled
Priority 100
Redirect timer 600 seconds
Weighting 100
