Dell Networking S6000 Uživatelský manuál stáhnout pdf (Strana 905)

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Functional Overview of VXLAN Gateway

The following section is the functional overview of VXLAN Gateway:

1. Provides connectivity between a Virtual server infrastructure and a Physical server infrastructure.

2. Provides the functions performed by a VTEP in a virtual server infrastructure. The functions of a VTEP

are:

• VTEP is responsible for creating one or more logical networks.

• VTEP is responsible for identifying and binding a Port and VLAN to a logical network

• VTEP maintains MAC bindings to a VTEP.

• VTEP is typically managed by a network orchestrator. In the case of S6000 being the VTEP, the

VXLAN from VMWare is the network orchestrator.

• VXLAN communicates with the S6000 VTEP via a standard protocol called OvsDb Protocol. The

protocol uses the JSON RPC-based message format.

• The S6000 VTEP acts according to the TOR schema defined by VMWare. The solution is very

specific to VMWare-based orchestration platforms and does not work with other orchestration

platforms.

VXLAN Frame Format

VXLAN provides a mechanism to extend an L2 network over an L3 network. In short, VXLAN is an L2

overlay scheme over an L3 network and this overlay is termed as a VXLAN segment. VMs within the same

VXLAN segment communicate with each other through a 24–bit ID called VXLAN Network Identifier

(VNI). This 24–bit ID allows up to 16 million VXLAN segments to coexist within the same administrative

domain. The VNI scopes the inner MAC frame originated by the VM. This model has over-lapping MAC

addresses without traffic cross-over

VXLAN achieves L2 over L3 overlay using the tunneling mechanism. VTEPs are the end points of a tunnel

located within the hypervisor on the server that hosts VMs. The VXLAN frame format is shown in the

following figure:

Virtual Extensible LAN (VXLAN)

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