This PPT Contains VXLAN Overview, Terminologies used in RFC7348, Explaining why VXLAN is needed, and how it works

1. Introduction to
VXLAN
By Mohammed Umair

2. VXLAN Overview
 VXLAN provides large number of broadcast
segments as many as 16 million segments
 Data-traffic will be forwarded loop free.
 Data-traffic using VXLAN can be load-
balanced on ECMP.

3. VXLAN Terminologies (As per
RFC-7348)
 VXLAN - Virtual eXtensible Local Area
Network
 VM - Virtual Machine
 VNI – Virtual Network Identifier (or VXLAN
Segment ID)
 VTEP - VXLAN Tunnel End Point. An entity
that originates and/or terminates VXLAN
tunnels

4. Why VXLAN
 A Physical Server can have multiple Virtual
machines with its own MAC
 Current VLAN limit of 4094 is inadequate,
when traffic isolation is required between the
group of VM’s across the Data-Center
 Further to avoid Loops STP blocks redundant
links connected between switches, this is
problem since data-center operators pay for
each and every port.

5. Why VXLAN Contd..
 Further using STP, one cannot achieve load-
balancing of Data-Traffic.
 With current Layer2 model, all the switches in
Data-center must have to learn all MAC
address for proper forwarding of traffic.

6. How VXLAN Works
 VXLAN is a overlay technology, that works on
Layer3 underlay
 A native/original Data packet will be
encapsulated with VXLAN and IP header in
VTEP (VXLAN tunnel end points).
 A VTEP is as device that supports VXLAN,
they can be end hosts or Network
switches/routers.

7. How VXLAN Works contd…
 A VTEP will encapsulate a data-packet by adding number of
fields as below
a) Outer media access control (MAC) destination address (MAC
address of the tunnel endpoint VTEP, or next Router)
b) Outer MAC source address (MAC address of the tunnel source
VTEP)
c) Outer IP destination address (IP address of the tunnel endpoint
VTEP)
d) Outer IP source address (IP address of the tunnel source VTEP)
e) Outer UDP header
f) A VXLAN header that includes a 24-bit field—called the VXLAN
network identifier (VNI)

8. Thank You