In GLBP, which router will respond to client ARP requests?

The correct answer is A. The active virtual gateway will reply with one of four possible virtual MAC addresses.. In GLBP, there is one elected AVG (Active Virtual Gateway) per group. When a client sends an ARP request for the virtual IP address, only the AVG replies - but it does so by returning one of up to four virtual MAC addresses (one per AVF). This allows different clients to have dif

Operate a Medium-Sized Switched Network

Question

In GLBP, which router will respond to client ARP requests?

Options

AThe active virtual gateway will reply with one of four possible virtual MAC addresses.
BAll GLBP member routers will reply in round-robin fashion.
CThe active virtual gateway will reply with its own hardware MAC address.
DThe GLBP member routers will reply with one of four possible burned in hardware addresses.

How the community answered

(46 responses)

A
89% (41)
B
7% (3)
C
2% (1)
D
2% (1)

Explanation

In GLBP, there is one elected AVG (Active Virtual Gateway) per group. When a client sends an ARP request for the virtual IP address, only the AVG replies - but it does so by returning one of up to four virtual MAC addresses (one per AVF). This allows different clients to have different default gateway MACs, distributing traffic load across multiple routers. The virtual MACs follow the format 0007.B4xx.xxyy. No other router replies to ARP; the round-robin distribution happens at the ARP-reply level, controlled entirely by the AVG.

Topics

#GLBP#AVG#virtual MAC#ARP

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