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Message-Id: <20150811204716.79B2C29004D1@tardy> Date: Tue, 11 Aug 2015 13:47:16 -0700 (PDT) From: raj@...dy.usa.hp.com (Rick Jones) To: <netdev@...r.kernel.org> Cc: <davem@...emloft.net> Subject: [PATCH net-next] documentation: bring vxlan documentation more up-to-date From: Rick Jones <rick.jones2@...com> A few things have changed since the previous version of the vxlan documentation was written, so update it and correct some grammer and such while we are at it. Signed-off-by: Rick Jones <rick.jones2@...com> diff --git a/Documentation/networking/vxlan.txt b/Documentation/networking/vxlan.txt index 6d99351..4126031 100644 --- a/Documentation/networking/vxlan.txt +++ b/Documentation/networking/vxlan.txt @@ -1,32 +1,38 @@ 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 that is designed to solve +the problem of the limited number of available 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. -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 similar fashion 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 - -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. + # ip link add vxlan0 type vxlan id 42 group 239.1.1.1 dev eth1 + +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 is in the forwarding table. 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. If you wish to use the IANA-assigned +destination port number of 4789 you can add "dstport 4789" to the +command line above. 2. Delete vxlan device # ip link delete vxlan0 -- To unsubscribe from this list: send the line "unsubscribe netdev" in the body of a message to majordomo@...r.kernel.org More majordomo info at http://vger.kernel.org/majordomo-info.html
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