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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 |
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35 | # ip -d link show vxlan0 |
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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 |
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44 | # bridge fdb delete 00:17:42:8a:b4:05 dev vxlan0 |
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45 | |
46 | 3. Show forwarding table |
47 | # bridge fdb show dev vxlan0 |