|Exam 200-120||Question id=74||IP Services|
In GLBP, which router will respond to client ARP requests?
The active virtual gateway will reply with one of four possible virtual MAC addresses.|
All GLBP member routers will reply in round-robin fashion.|
The active virtual gateway will reply with its own hardware MAC address.|
The GLBP member routers will reply with one of four possible burned in hardware addresses.|
GLBP - Gateway Load Balancing Protocol
GLBP Active Virtual Gateway
Members of a GLBP group elect one gateway to be the active virtual gateway (AVG) for that group. Other group members provide backup for the AVG in the event that the AVG becomes unavailable. The AVG assigns a virtual MAC address to each member of the GLBP group. Each gateway assumes responsibility for forwarding packets sent to the virtual MAC address assigned to it by the AVG. These gateways are known as active virtual forwarders (AVFs) for their virtual MAC address.
The AVG is responsible for answering Address Resolution Protocol (ARP) requests for the virtual IP address. Load sharing is achieved by the AVG replying to the ARP requests with different virtual MAC addresses.