Home » Cisco » 350-080 » What is the purpose of this command on the Cisco Nexus 7000 switch?
Refer to the exhibit.
What is the purpose of this command on the Cisco Nexus 7000 switch?
A. The command enables conversational learning on FabricPath VLANs 1 through 10 for the F Series module.
B. The command enables the FabricPath protocol on VLANs 1 through 10.
C. There is no need for this command because conversational learning is enabled by default for all VLANs.
D. The command enables conversational learning on a classic Ethernet VLAN for the F Series module.
Correct Answer: D
Explanation/Reference:
Explanation:
With conversational MAC learning, the interface learns only the source MAC address of an ingressing frame if that interface already has the destination MAC address present in the MAC address table. If the source MAC address interface does not already know the destination MAC address, it does not learn that MAC address. Each interface learns only those MAC addresses that are actively speaking with the interface. In this way, conversational MAC learning consists of a three-way handshake. The interface learns the MAC address only if that interface is having a bidirectional conversation with the corresponding interface. Unknown MAC address are forwarded, or flooded, throughout the network.
This combination of conversational MAC address learning and multiple FEs on each F Series module produces greatly reduced mAC address tables on each F Series module.
For CE VLANs, you can configure conversational learning per VLAN on the F Series module using the command-line interface (CLI). CE VLANs use traditional MAC address learning by default. Traditional MAC learning is not supported on FabricPath VLANs with Cisco Release NX-OS 5.1 or higher.
Reference: http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/fabricpath/configuration/guide/fp_switching.html (conversational Mac
Address Learning)
