Network Extension does not detect or mitigate MAC conflicts.Network Extension does not detect or mitigate IP conflicts.Virtual machine networks that span more than one vCenter Server must not be extended from more than one vCenter to the same destination router.Network Extension does not detect or mitigate loops.Networks can only be extended between one appliance pair (source and destination appliances) per site, and multiple network appliances cannot be used to increase throughput.One Network Extension appliance can only connect to one Distributed Virtual Switch or NSX Transport Zone.Daisy-chain extension can lower end-to-end network performance due to the combined latency and additional layer of packet and encryption processing.Daisy-chain extension is not supported with source networks based on NSX distributed routing.Daisy-chain "L" network extension (extending extensions) is only supported to one additional environment in the same data center, public cloud provider, and region.
One Network Extension configuration cannot be extended multiple times to the same destination router.HCX supports extending the same network to a maximum of 3 distinct destinations or routers.NSX-V at the cloud is unsupported for HCX Cloud Manager.HCX does not integrate with the NSX Global Manager (only the NSX Local Manager). NSX-T Global Federation configurations.HCX Network Extension does not support the following destination configurations: Secondary subnets in a single layer-2 network.Virtual machine networks with shared or overlapping VLAN configurations must not be extended to the same destination router.Using multiple bridging solutions simultaneously can result in a network outage. For example, either HCX Network Extension or NSX L2 VPN can be used to provide connectivity, but both must not be used simultaneously. HCX does not support Network Extension for networks already extended to the same NSX router by an external solution. Virtual machine networks must only be extended with a single solution.Cisco Application Centric Infrastructure (ACI) with VMware Virtual Machine Monitor (VMM).Cisco Nexus 1000v or other third-party switches.vSphere Standard Switch (VSS) networks.HCX Network Extension does not support the following source configurations: vCenter Server backed Port Groups configured with ephemeral binding cannot be extended.Untagged Distributed Port Groups (Distributed Port Groups with VLAN type None, ID 0 or NULL).HCX Network Profile networks (Distributed Port Groups or Segments selected in a Network Profile).vSphere infrastructure networks (ESXi VMkernel networks).The HCX Network Extension service detects and prevents several non-supported Network Extension scenarios (items are dimmed in the Network Extension UI): Detected and Restricted Source Network Types HCX Network Extension is allowed or prevented under certain conditions.
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