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-.. _mpls:
-
-####################################
-MPLS (Multiprotocol Label Switching)
-####################################
-
-:abbr:`MPLS (Multi-Protocol Label Switching)` is a packet forwarding paradigm
-which differs from regular IP forwarding. Instead of IP addresses being used to
-make the decision on finding the exit interface, a router will instead use an
-exact match on a 32 bit/4 byte header called the MPLS label. This label is
-inserted between the ethernet (layer 2) header and the IP (layer 3) header.
-One can statically or dynamically assign label allocations, but we will focus
-on dynamic allocation of labels using some sort of label distribution protocol
-(such as the aptly named Label Distribution Protocol / LDP, Resource Reservation
-Protocol / RSVP, or Segment Routing through OSPF/ISIS). These protocols allow
-for the creation of a unidirectional/unicast path called a labeled switched
-path (initialized as LSP) throughout the network that operates very much like
-a tunnel through the network. An easy way of thinking about how an MPLS LSP
-actually forwards traffic throughout a network is to think of a GRE tunnel.
-They are not the same in how they operate, but they are the same in how they
-handle the tunneled packet. It would be good to think of MPLS as a tunneling
-technology that can be used to transport many different types of packets, to
-aid in traffic engineering by allowing one to specify paths throughout the
-network (using RSVP or SR), and to generally allow for easier intra/inter
-network transport of data packets.
-
-For more information on how MPLS label switching works, please go visit
-`Wikipedia (MPLS)`_.
-
-.. note:: MPLS support in VyOS is not finished yet, and therefore its
-   functionality is limited. Currently there is no support for MPLS enabled VPN
-   services such as L3VPNs, L2VPNs, and mVPNs. RSVP support is also not present
-   as the underlying routing stack (FRR) does not implement it. Currently VyOS
-   can be configured as a label switched router (MPLS P router), in both
-   penultimate and ultimate hop popping operations.
-
-Label Distribution Protocol
-===========================
-
-The :abbr:`MPLS (Multi-Protocol Label Switching)` architecture does not assume
-a single protocol to create MPLS paths. VyOS supports the Label Distribution
-Protocol (LDP) as implemented by FRR, based on :rfc:`5036`.
-
-:abbr:`LDP (Label Distribution Protocol)` is a TCP based MPLS signaling protocol
-that distributes labels creating MPLS label switched paths in a dynamic manner.
-LDP is not a routing protocol, as it relies on other routing protocols for
-forwarding decisions. LDP cannot bootstrap itself, and therefore relies on said
-routing protocols for communication with other routers that use LDP.
-
-In order to allow for LDP on the local router to exchange label advertisements
-with other routers, a TCP session will be established between automatically
-discovered and statically assigned routers. LDP will try to establish a TCP
-session to the **transport address** of other routers. Therefore for LDP to
-function properly please make sure the transport address is shown in the
-routing table and reachable to traffic at all times.
-
-It is highly recommended to use the same address for both the LDP router-id and
-the discovery transport address, but for VyOS MPLS LDP to work both parameters
-must be explicitly set in the configuration.
-
-Configuration Options
-=====================
-
-.. cfgcmd:: set protocols mpls ldp interface <interface>
-
-  Use this command to enable LDP, and enable MPLS processing on the interface you
-  define.
-
-.. cfgcmd:: set protocols mpls ldp router-id <address>
-
-  Use this command to configure the IP address used as the LDP router-id of the
-  local device.
-
-.. cfgcmd:: set protocols mpls ldp discovery transport-ipv4-address <IPv4 address>
-.. cfgcmd:: set protocols mpls ldp discovery transport-ipv6-address <IPv6 address>
-
-  Use this command to set the IPv4 or IPv6 transport-address used by LDP.
-
-.. cfgcmd:: set protocols mpls ldp neighbor <IPv4 address> password <password>
-
-  Use this command to configure authentication for LDP peers. Set the
-  IP address of the LDP peer and a password that should be shared in
-  order to become neighbors.
-
-.. cfgcmd:: set protocols mpls ldp discovery hello-interval <seconds>
-.. cfgcmd:: set protocols mpls ldp discovery hello-holdtime <seconds>
-
-  Use this command if you would like to set the discovery hello and hold time
-  parameters.
-
-.. cfgcmd:: set protocols mpls ldp discovery session-ipv4-holdtime <seconds>
-.. cfgcmd:: set protocols mpls ldp discovery session-ipv6-holdtime <seconds>
-
-  Use this command if you would like to set the TCP session hold time intervals.
-
-.. cfgcmd:: set protocols mpls ldp export ipv4 explicit-null
-.. cfgcmd:: set protocols mpls ldp export ipv6 explicit-null
-
-  Use this command if you would like for the router to advertise FECs with a label
-  of 0 for explicit null operations.
-
-
-Sample configuration to setup LDP on VyOS
------------------------------------------
-
-.. code-block:: none
-
-  set protocols ospf area 0 network '192.168.255.252/32'                      <--- Routing for loopback
-  set protocols ospf area 0 network '192.168.0.5/32'                          <--- Routing for an interface connecting to the network
-  set protocols ospf parameters router-id '192.168.255.252'                   <--- Router ID setting for OSPF
-  set protocols mpls ldp discovery transport-ipv4-address '192.168.255.252'   <--- Transport address for LDP for TCP sessions to connect to
-  set protocols mpls ldp interface 'eth1'                                     <--- Enable MPLS and LDP for an interface connecting to network
-  set protocols mpls ldp interface 'lo'                                       <--- Enable MPLS and LDP on loopback for future services connectivity
-  set protocols mpls ldp router-id '192.168.255.252'                          <--- Router ID setting for LDP
-  set interfaces ethernet eth1 address '192.168.0.5/31'                       <--- Interface IP for connecting to network
-  set interfaces loopback lo address '192.168.255.252/32'                     <--- Interface loopback IP for router ID and other uses
-
-
-Operational Mode Commands
-=========================
-
-When LDP is working, you will be able to see label information in the outcome
-of ``show ip route``. Besides that information, there are also specific *show*
-commands for LDP:
-
-Show
-----
-
-.. opcmd:: show mpls ldp binding
-
-  Use this command to see the Label Information Base.
-
-.. opcmd:: show mpls ldp discovery
-
-  Use this command to see discovery hello information
-
-.. opcmd:: show mpls ldp interface
-
-  Use this command to see LDP interface information
-
-.. opcmd:: show mpls ldp neighbor
-
-  Use this command to see LDP neighbor information
-
-.. opcmd:: show mpls ldp neighbor detail
-
-  Use this command to see detailed LDP neighbor information
-
-Reset
------
-
-.. opcmd:: reset mpls ldp neighbor <IPv4 or IPv6 address>
-
-  Use this command to reset an LDP neighbor/TCP session that is established
-
-
-.. _`Wikipedia (MPLS)`: https://en.wikipedia.org/wiki/Multiprotocol_Label_Switching