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Linux/Documentation/networking/vxlan.txt

  1 Virtual eXtensible Local Area Networking documentation
  2 ======================================================
  3 
  4 The VXLAN protocol is a tunnelling protocol that is designed to
  5 solve the problem of limited number of available VLAN's (4096).
  6 With VXLAN identifier is expanded to 24 bits.
  7 
  8 It is a draft RFC standard, that is implemented by Cisco Nexus,
  9 Vmware and Brocade. The protocol runs over UDP using a single
 10 destination port (still not standardized by IANA).
 11 This document describes the Linux kernel tunnel device,
 12 there is also an implantation of VXLAN for Openvswitch.
 13 
 14 Unlike most tunnels, a VXLAN is a 1 to N network, not just point
 15 to point. A VXLAN device can either dynamically learn the IP address
 16 of the other end, in a manner similar to a learning bridge, or the
 17 forwarding entries can be configured statically.
 18 
 19 The management of vxlan is done in a similar fashion to it's
 20 too closest neighbors GRE and VLAN. Configuring VXLAN requires
 21 the version of iproute2 that matches the kernel release
 22 where VXLAN was first merged upstream.
 23 
 24 1. Create vxlan device
 25   # ip li add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1
 26 
 27 This creates a new device (vxlan0). The device uses the
 28 the multicast group 239.1.1.1 over eth1 to handle packets where
 29 no entry is in the forwarding table.
 30 
 31 2. Delete vxlan device
 32   # ip link delete vxlan0
 33 
 34 3. Show vxlan info
 35   # ip -d link show vxlan0
 36 
 37 It is possible to create, destroy and display the vxlan
 38 forwarding table using the new bridge command.
 39 
 40 1. Create forwarding table entry
 41   # bridge fdb add to 00:17:42:8a:b4:05 dst 192.19.0.2 dev vxlan0
 42 
 43 2. Delete forwarding table entry
 44   # bridge fdb delete 00:17:42:8a:b4:05 dev vxlan0
 45 
 46 3. Show forwarding table
 47   # bridge fdb show dev vxlan0

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