Dell PowerSwitch S4128F-ON OS10 Enterprise Edition User Guide Release 10.4.3.0 - Page 680

Virtual extensible LAN (VXLAN) VXLAN network identifier (VNI) VXLAN tunnel endpoint (VTEP) Bridge domain A type of network virtualization overlay that encapsulates a tenant payload into IP UDP packets for transport across the IP underlay network. A 24-bit ID number that identifies a tenant segment and transmits in a VXLAN-encapsulated packet. A switch with connected end hosts that are assigned to virtual networks. The virtual networks map to VXLAN segments. Local and remote VTEPs perform encapsulation and de-capsulation of VXLAN headers for the traffic between end hosts. A VTEP is also known as a network virtualization edge (NVE) node. A L2 domain that receives packets from member interfaces and forwards or floods them to other member interfaces based on the destination MAC address of the packet. OS10 supports two types of bridge domains: simple VLAN and virtual network. • Simple VLAN: A bridge domain a VLAN ID represents. Traffic on all member ports is assigned with the same VLAN ID. • Virtual network: A bridge domain a virtual network ID (VNID) represents. A virtual network supports overlay encapsulation and maps with either a single VLAN ID in a switch-scoped VLAN or with multiple (Port,VLAN) pairs in a port-scoped VLAN. Distributed routing All VTEPs in a virtual network perform intersubnet routing and serve as L3 gateways in two possible modes: • Asymmetric routing: All VTEPs can perform routing. Routing decisions are made only on ingress VTEPs. Egress VTEPs perform bridging. • Symmetric routing: All VTEPs perform routing. Routing decisions are made on both ingress and egress VTEPs. Virtual network Virtual network identifier (VNID) Virtual-network interface Access port Network port Switch-scoped VLAN In OS10, each L2 flooding domain in the overlay network is represented as a virtual network. A 16-bit ID number that identifies a virtual network in OS10. A router interface that connects a virtual network bridge to a tenant VRF routing instance. A port on a VTEP switch that connects to an end host and is part of the overlay network. A port on a VTEP switch that connects to the underlay network. A VLAN that is mapped to a virtual network ID (VNID) in OS10. All member ports of the VLAN are automatically added to the virtual network. • You can map only one VLAN ID to a virtual network. • Ideally suited for existing tenant VLANs that stretch over an IP fabric using VXLAN. Port-scoped VLAN A Port,VLAN pair that maps to a virtual network ID (VNID) in OS10. Assign an individual member interface to a virtual network either with an associated tagged VLAN or as an untagged member. Using a port-scoped VLAN, you can configure: • The same VLAN ID on different access interfaces to different virtual networks. • Different VLAN IDs on different access interfaces to the same virtual network. VXLAN as NVO solution Network virtualization overlay (NVO) is a solution that addresses the requirements of a multi-tenant data center, especially one with virtualized hosts. An NVO network is an overlay network that is used to extend L2 connectivity among VMs belonging to a tenant segment over an underlay IP network. Each tenant payload is encapsulated in an IP packet at the originating VTEP. To access the payload, the tenant payload is stripped of the encapsulation at the destination VTEP. Each tenant segment is also known as a virtual-network and is uniquely identified in OS10 using a virtual network ID (VNID). 680 VXLAN