Brocade FastIron Ethernet Switch Platform and Layer 2 Swit Instrukcja Użytkownika Pobierz pdf (Strona 430)

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VXLAN gateway overview

Virtual Extensible Local Area Network (VXLAN) is an overlay technology to create a logical Layer 2

network on top of an Layer 3 IP network.

Addressing the need for overlay networks in Layer 2 and Layer 3 data center networks that support

multi-tenant environments, VXLAN functions as a framework to create a Layer 2 logical network over

the existing Layer 3 infrastructure. In this way, VXLAN addresses the scalability requirements of cloud

computing.

VXLAN extends the VLAN address space by adding a 24-bit segment ID called VXLAN Network

Identifier (VNI) and enables 16 million VXLAN network segments. The VNI in each frame segregates

individual logical networks, allowing millions of individual Layer 2 VXLAN segments to coexist on a

common Layer 3 network. Each {Port, VLAN} pair is mapped to a unique VNI to extend the Layer 2

VLAN segment to a remote location.

FIGURE 96 VXLAN gateway

VXLAN Ethernet frame encapsulation

VXLAN uses a tunneling method to carry the Layer 2 overlay network traffic over the Layer 3

networks. Communication is established between two tunnel endpoints called Virtual Tunnel

Endpoints (VTEPs). VXLAN is a MAC Address-in-User Datagram Protocol (MAC-in-UDP)

encapsulation, which encapsulates MAC frames at Layer 2 into a Layer 3 UDP header with an outer

VXLAN gateway overview

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