CCNP DC knowledge - OTV

With the deepening of the cloud computing revolution, large data centers will adopt a distributed deployment approach. Large data centers will deploy multiple data centers in multiple locations around the world, so deployment can effectively guarantee the continuity of business services, assuming that any data center has a serious failure, and will not affect or interrupt the service to commercial customers. Such distributed deployment of data centers can also enable distributed applications, workload roaming and computing resource utilization maximization.
Traditional Layer 2 extension technology, to achieve distributed deployment of data centers, has the following problems: Fan Hong behavior, maintenance of pseudo links, fault boundaries, multi-homing, and need for dedicated lines.
OTV technology advantage
Overlay Transport Virtualization technology, referred to as OTV technology, is a Layer 2 network extension technology designed by Cisco for distributed data centers. He has the following characteristics
Maintenance of the non-pseudo link state: OTV is a "point to cloud" connection that implements virtual Any to Any communication without maintaining any tunnel and pseudo link related information.
Optimized multicast replication: OTV is recommended to work in multicast mode. OTVs working in this mode can use the carrier network to achieve optimized multicast replication, which perfectly supports multicast operation between distributed data centers.
Site independence and fault isolation: OTV effectively isolates broadcasts and unicasts that do not know the purpose. And each site runs a separate spanning tree to achieve site independence. Each site is a fault domain, and failure of any one site will only affect the site and will not spread to the entire distributed data center.
Automatic multi-homing: Each data center can apply for multiple uplinks. OTV supports automatic multi-homing, no additional configuration and multi-homing for OTV. And OTV built-in release mechanism eliminates loops between distributed data centers and multi-homed data centers.
Introduction to Data Plane in the site
The working principle of the Data Plane in the OTV site is the same as that of the traditional switch. When the source MAC address of the host is MAC1 and the data frame whose destination MAC address is MAC2 arrives at the border device of the OTV, the OTV border device queries the local MAC address. table
Introduction to the working principle of OTV Control Plane multicast mode
OTV recommends using the multicast mode of operation. Only the multicast mode can take full advantage of OTV. To use the OTV multicast mode, the carrier's network must have multicast routing. If the carrier cannot support multicast, it can only use the OTV unicast mode.
OTV multicast transmission
The OTV Control Plane traffic can be transmitted through multicast, and it is obvious that the OTV of the multicast working mode is more efficient than the unicast mode. The OTV uses PIM Any-Source-Multicast (Sparse Source Multicast) Sparse- Mode (sparse mode) to transmit the stream of OTV Control Plane. OTV can not only transmit traffic of Control Plane through multicast, but also use PIM Source-Specific-Multicast to transmit traffic of Data Plane.

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