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For the duration of his keynote this morning at VMworld, VMware CTO Steve Herrod declared VXLAN, the company’s effort to permit virtual devices to span geographical information centers as part of the exact same Nearby Region Network. Small for Virtual eXtensible LAN, Herrod wrote on his website that it “enables multi-tenant networks at scale, and it is the very first phase in direction of logical, computer software-centered networks that can be produced on-need, enabling enterprises to leverage capability wherever it’s obtainable.”
In other phrases, VXLAN could aid businesses create genuine worldwide clouds that are the sum of their components rather than unique sets of parts. Presently, virtual sources this kind of as storage and compute are minimal to the constraints of a solitary bodily network within a single physical info middle. Even when instruments such as VMware’s vMotion or DRS shift workloads or VMs from device to device, they cannot escape the information center’s four partitions. Herrod describes the issue utilizing a telephony analogy:

1 of the elementary challenges with today’s networking is that we use an IP address for two unrelated purposes, as an identification AND as a location. Tying these with each other restricts a (virtual) device from relocating about as quickly as we would like. We had the same challenge with telephony just before wireless arrived of age. . . our mobile phone range rang for us at a distinct destination rather than adhering to us wherever we went!

VXLAN separates a VM’s network ID from its bodily spot utilizing a Layer 2 abstraction. The outcome, writes Herrod, is that “VMs are completely unaware of the bodily networks constraints and only see the virtual layer 2-adjacency [and] the basic attributes of virtualization this kind of as mobility and portability are extended across conventional network boundaries.”

Cisco currently supports a equivalent capability with its Overlay Transport Virtualization engineering, but the primary difference seems to be that OTV is restricted to Layer two networks (i.e., LANs) and Cisco Nexus gear. VXLAN can cross even Layer three boundaries to let customers integrate even cloud-primarily based assets. Cisco’s Omar Sultan wrote on his weblog that “VXLAN is the foundation of a scalable cloud network in which tons of logical networks (over 16M . . .) can be designed immediately to meet the requirements of the even the most complicated and dynamic cloud.”
Also, VMware is pushing to make VXLAN an standard, and had broad network sector help, which includes from Cisco, Arista, Broadcom, Brocade, Emulex and Intel.
Much more info about the engineering is accessible on Herrod’s website, as nicely as on the group’s IETF submittal.
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