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d342894c | 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 |