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What is the role of AVG in GLBP?
All host traffic passes through the AVG.
The AVG replies to all ARP requests for the virtual IP address.
The AVG replies to all ARP Requests with its own virtual MAC address.
All of these.
The AVG (Active Virtual Gateway) has a special role in GLBP (Gateway Load Balancing Protocol). Two or more routers on a LAN subnet form a GLBP group. Each GLBP router interface has a unique physical IP address. There also is a single virtual IP address that is configured on all routers in addition to physical IP addresses. The virtual IP address is used by all hosts as their default gateway. The first step for a host that wants to send data is to find out the MAC address of its default gateway. The host will send an ARP Request for its default gateway, which is the same as GLBP virtual IP address. The AVG handles all ARP requests for the virtual IP address. The AVG uses ARP Reply messages to provide hosts with MAC address for the default gateway. The AVG tactfully provides MAC addresses of different GLBP routers to different hosts for the same default gateway IP address. As a result, different hosts send traffic to different routers in the GLBP group. Traffic from all hosts does not pass through the AVG it is balanced across different routers. The AVG just replies to all ARP Requests with MAC addresses of different routers.
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