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Documentation / networking / vxlan.txt

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Based on kernel version 4.2. Page generated on 2015-09-09 12:14 EST.

1	Virtual eXtensible Local Area Networking documentation
2	======================================================
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.
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.
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.
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.
24	1. Create vxlan device
25	  # ip li add vxlan0 type vxlan id 42 group dev eth1
27	This creates a new device (vxlan0). The device uses the
28	the multicast group over eth1 to handle packets where
29	no entry is in the forwarding table.
31	2. Delete vxlan device
32	  # ip link delete vxlan0
34	3. Show vxlan info
35	  # ip -d link show vxlan0
37	It is possible to create, destroy and display the vxlan
38	forwarding table using the new bridge command.
40	1. Create forwarding table entry
41	  # bridge fdb add to 00:17:42:8a:b4:05 dst dev vxlan0
43	2. Delete forwarding table entry
44	  # bridge fdb delete 00:17:42:8a:b4:05 dev vxlan0
46	3. Show forwarding table
47	  # bridge fdb show dev vxlan0
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