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..
Licensed under the Apache License, Version 2.0 (the "License"); you may
not use this file except in compliance with the License. You may obtain
a copy of the License at
http://www.apache.org/licenses/LICENSE-2.0
Unless required by applicable law or agreed to in writing, software
distributed under the License is distributed on an "AS IS" BASIS, WITHOUT
WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied. See the
License for the specific language governing permissions and limitations
under the License.
Convention for heading levels in Open vSwitch documentation:
======= Heading 0 (reserved for the title in a document)
------- Heading 1
~~~~~~~ Heading 2
+++++++ Heading 3
''''''' Heading 4
Avoid deeper levels because they do not render well.
=======
Bareudp
=======
Q: What is Bareudp?
A: There are various L3 encapsulation standards using UDP being discussed
to leverage the UDP based load balancing capability of different
networks. MPLSoUDP (__ https://tools.ietf.org/html/rfc7510) is one among
them.
The Bareudp tunnel provides a generic L3 encapsulation support for
tunnelling different L3 protocols like MPLS, IP, NSH etc. inside a UDP
tunnel.
An example to create bareudp device to tunnel MPLS unicast traffic is
given below.::
$ ovs-vsctl add-port br0 mpls_udp_port -- set interface udp_port \
type=bareudp options:remote_ip=2.1.1.3 options:local_ip=2.1.1.2 \
options:payload_type=0x8847 options:dst_port=6635
The option payload_type specifies the ethertype of the l3 protocol which
the bareudp device will be tunnelling.
The bareudp device supports special handling for MPLS & IP as they can
have multiple ethertypes.
MPLS procotcol can have ethertypes ETH_P_MPLS_UC (unicast) &
ETH_P_MPLS_MC (multicast). IP protocol can have ethertypes ETH_P_IP (v4)
& ETH_P_IPV6 (v6).
The bareudp device to tunnel L3 traffic with multiple ethertypes
(MPLS & IP) can be created by passing the L3 protocol name as string in
the field payload_type.
An example to create bareudp device to tunnel
MPLS unicast & multicast traffic is given below.::
$ ovs-vsctl add-port br0 mpls_udp_port -- set interface udp_port \
type=bareudp options:remote_ip=2.1.1.3 options:local_ip=2.1.1.2 \
options:payload_type=mpls options:dst_port=6635
The below example ovs rule shows how a bareudp tunnel port is used to
tunnel an MPLS packet inside a UDP tunnel.::
$ ovs-ofctl -O OpenFlow13 add-flow br0 "in_port=10,dl_type=0x0800,\
actions=push_mpls:0x8847,set_field:3->mpls_label,\
output:mpls_udp_port"
This rule does MPLS encapsulation on IP packets and sends the l3 MPLS
packets on a bareudp tunnel port which has its payload_type configured
to 0x8847.
An example to create bareudp device to tunnel
IPv4 & IPv6 traffic is given below.::
$ ovs-vsctl add-port br0 ip_udp_port -- set interface udp_port \
type=bareudp options:remote_ip=2.1.1.3 options:local_ip=2.1.1.2 \
options:payload_type=ip options:dst_port=6636
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