What does the VXLAN source port add to the overlay packet forwarding when it uses the hash of Layer 2, Layer 3, and Layer 4 headers of the inner packet?
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A. B. C. D.A.
https://www.cisco.com/c/en/us/support/docs/lan-switching/vlan/212682-virtual-extensible-lan-and-ethernet-virt.htmlVXLAN (Virtual Extensible LAN) is a network virtualization technology that enables the creation of logical networks over an existing physical network infrastructure. VXLAN packets encapsulate Layer 2 Ethernet frames inside Layer 3 IP packets, allowing them to be transmitted over an IP network.
In VXLAN, the source port is used to add entropy to the hash function used for forwarding the overlay packets. The hash function is used to determine the egress VTEP (VXLAN Tunnel Endpoint) for the packet based on the Layer 2, Layer 3, and Layer 4 headers of the inner packet. By adding entropy to the hash function, the likelihood of packet distribution across multiple links is increased, enabling equal-cost multi-path (ECMP) forwarding.
Equal-cost multi-path (ECMP) forwarding is a technique that enables traffic to be distributed across multiple paths that have the same cost. This technique helps to increase network performance, scalability, and redundancy. By using the hash of Layer 2, Layer 3, and Layer 4 headers of the inner packet along with the source port, VXLAN ensures that traffic is evenly distributed across multiple paths, enabling ECMP forwarding.
Therefore, the correct answer to the question is A. ECMP. VXLAN source port adds entropy to the hash function used for forwarding the overlay packets, allowing for equal-cost multi-path (ECMP) forwarding. The other options, such as TCP optimization, disabled fragmentation, and jumbo frames, are not directly related to VXLAN source port or its function in the overlay packet forwarding.