August 2018
Beginner
462 pages
12h 36m
English
Content preview from Learning OpenStack Networking - Third Edition
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Virtual Extensible Local Area Network (VXLAN)
This book focuses primarily on VXLAN, an overlay technology that helps address scalability issues with VLANs. VXLAN encapsulates layer 2 Ethernet frames inside layer 4 UDP packets that can be forwarded or routed between hosts. This means that a virtual network can be transparently extended across a large network without any changes to the end hosts. In the case of OpenStack Networking, however, a VXLAN mesh network is commonly constructed only between nodes that exist in the same cloud.
Rather than use VLAN IDs to differentiate between networks, VXLAN uses a VXLAN Network Identifier (VNI) to serve as the unique identifier on a link that potentially carries traffic for tens of thousands of networks, ...
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