Based on kernel version 4.0. Page generated on 2015-04-14 21:25 EST.
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 18.104.22.168 dev eth1 26 27 This creates a new device (vxlan0). The device uses the 28 the multicast group 22.214.171.124 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 126.96.36.199 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