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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 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 | ||
45 | |||
46 | 3. Show forwarding table | ||
47 | # bridge fdb show dev vxlan0 | ||