Brocade FastIron Ethernet Switch Platform and Layer 2 Switching Configuration Guide - Manual (Page 431)

Ethernet header, outer IP header, outer UDP header, and VXLAN header. The outer IP header contains
the corresponding source and destination VTEP IP addresses.
VTEPs are the nodes that provide the encapsulation and decapsulation functions and also map the
tenant traffic to the virtual network and vice versa. The tenant’s Layer 2 frame is encapsulated with the
Layer 3 UDP header to send it to the remote location (VTEP). The remote end decapsulates the outer
header, and renders the original Layer 2 packet to the remote tenant.
FIGURE 97 VXLAN tunneling
As VXLAN is a tunneling technique, the VXLAN gateway is required to send traffic between VXLAN and
a traditional VLAN. Using VXLAN gateway mode in Top-of-Rack (ToR) deployments, you can establish
a tunnel at Layer 2 between two VXLAN gateways and extend the VLAN over an underlying Layer 3
infrastructure. The Brocade implementation of VXLAN gateway allows communication between the
VXLAN-aware world and the non-VXLAN-aware world. VXLAN allows E-Line service, which supports
point-to-point connections with the facility to map multiple VLANs over a single point-to-point (P2P)
tunnel.
The Brocade implementation of VXLAN supports the following:
• Multiple VNIs over same VXLAN tunnel: Brocade supports the multiplex and demultiplex of
multiple VNIs over the same VXLAN tunnel. This allows better scaling of the deployment.
• Multiple VXLAN tunnels: Brocade supports multiple VXLAN tunnels on a VTEP. These tunnels can
be over the same or different uplink ports. However, multiple Layer 2 tunnels are supported with the
following constraint:
If two or more Layer 2 tunnels share the same outgoing interface (Layer 2 port), the outer Layer 2
header (Destination MAC, Source MAC, and VLAN header) must be the same for both tunnels. In
other words, the Layer 3 outgoing interface, VRF, and the next-hop address must be the same for
the two tunnels.
• Access and Network port types: The tagged and untagged port types on the access and network
sides are supported.
• VLAN translation across VXLAN segment: VXLAN enables the connection between two Layer 2
networks and makes it appear like they share the same Layer 2 subnet. This allows virtual machines
to operate in separate VLANs while operating as if they were attached to the same Layer 2 subnet.
• Interop with old VXLAN implementation: Brocade implementation of VXLAN can interoperate with
legacy VXLAN implementations of other vendors, which assign UDP destination port for VXLAN
different from the IANA-assigned value of 4789.
NOTE
VXLAN is supported only on the Brocade ICX 7750.
VXLAN
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