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Showing posts from August, 2019

NSX VXLAN Logical Switch Replication mode

NSX VXLAN Logical Switch Replication Mode.

NSX controller is the central control point for all logical switches within a network and maintain information of all virtual machine, host, logical switch and VXLAN.

The controller support two new logical switch control plane mode.

1) Unicast
2) Hybrid

The replication mode tells NSX to manage BUM traffic which sent from virtual machine.

Multicast mode
Control plane operation is based on multicast flooding and learning.BUM traffic replication is based on L2 and L3 multicast.It require 1GMP and multicast routing.Unicast Mode Control Plane operation is based on NSX controller cluster.BUM traffic replication is based on unicast . (One destination at a time)Host depend on UTEP (unicast TAP) for replication for traffic on remote signal.
Hybrid Mode Bum traffic replication based on unicast and L2 multicast. Local replication is offloaded to physical network. Remote replication is based on unicast.

Overview on VXLAN


(Virtual Extensible Local Area Network)

Logical Switch reproduce switching functionality (Unicast, multicast or broadcast) in virtual environment which completely decouple from underlying hardware.

Logical Switches are similar to VXLAN in that they provides network connections to which you can attach virtual machine. The VM's can communicate with each other over VXLAN if they are connected to some logical switches.


The DLR support logical switches which are backed by VXLAN.

First-hop routing is handling on the host, the traffic is switched to appropriate logical switch. If the destination is at another host. the ethernet frame is placed in the VXLAN frame & forward.Only one VXLAN LIF can connect to logical switch. The next-hop can be an NSX Edge service gateway. VXLAN LIF can span all distributed switch in the transport zone.