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documentation: bring vxlan documentation more up-to-date 

A few things have changed since the previous version of the vxlan
documentation was written, so update it and correct some grammar and
such while we are at it.

Signed-off-by: Rick Jones <rick.jones2@hp.com>
Signed-off-by: David S. Miller <davem@davemloft.net>
This commit is contained in:
Rick Jones 2015-08-12 10:23:14 -07:00 committed by David S. Miller
parent b0c6ce2491
commit e8fed985d7
1 changed files with 24 additions and 20 deletions
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44
Documentation/networking/vxlan.txt
View File

@ -1,32 +1,36 @@
Virtual eXtensible Local Area Networking documentation
======================================================
The VXLAN protocol is a tunnelling protocol that is designed to
solve the problem of limited number of available VLAN's (4096).
With VXLAN identifier is expanded to 24 bits.
The VXLAN protocol is a tunnelling protocol designed to solve the
problem of limited VLAN IDs (4096) in IEEE 802.1q. With VXLAN the
size of the identifier is expanded to 24 bits (16777216).
It is a draft RFC standard, that is implemented by Cisco Nexus,
Vmware and Brocade. The protocol runs over UDP using a single
destination port (still not standardized by IANA).
This document describes the Linux kernel tunnel device,
there is also an implantation of VXLAN for Openvswitch.
VXLAN is described by IETF RFC 7348, and has been implemented by a
number of vendors. The protocol runs over UDP using a single
destination port. This document describes the Linux kernel tunnel
device, there is also a separate implementation of VXLAN for
Openvswitch.
Unlike most tunnels, a VXLAN is a 1 to N network, not just point
to point. A VXLAN device can either dynamically learn the IP address
of the other end, in a manner similar to a learning bridge, or the
forwarding entries can be configured statically.
Unlike most tunnels, a VXLAN is a 1 to N network, not just point to
point. A VXLAN device can learn the IP address of the other endpoint
either dynamically in a manner similar to a learning bridge, or make
use of statically-configured forwarding entries.
The management of vxlan is done in a similar fashion to it's
too closest neighbors GRE and VLAN. Configuring VXLAN requires
the version of iproute2 that matches the kernel release
where VXLAN was first merged upstream.
The management of vxlan is done in a manner similar to its two closest
neighbors GRE and VLAN. Configuring VXLAN requires the version of
iproute2 that matches the kernel release where VXLAN was first merged
upstream.
1. Create vxlan device
# ip li add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1
# ip link add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1 dstport 4789
This creates a new device (vxlan0). The device uses the
the multicast group 239.1.1.1 over eth1 to handle packets where
no entry is in the forwarding table.
This creates a new device named vxlan0. The device uses the multicast
group 239.1.1.1 over eth1 to handle traffic for which there is no
entry in the forwarding table. The destination port number is set to
the IANA-assigned value of 4789. The Linux implementation of VXLAN
pre-dates the IANA's selection of a standard destination port number
and uses the Linux-selected value by default to maintain backwards
compatibility.
2. Delete vxlan device
# ip link delete vxlan0