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.. _mpls:
****
MPLS
****
Label Distribution Protocol
===========================
.. note:: VyOS' MPLS support is not finished yet, its funcitionality is
limited. Currently it can only be configured as a P router, that is,
an LSR in the core of an MPLS network.
The **Multi-Protocol Label Switching** (MPLS) 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 <https://tools.ietf.org/html/rfc5036.html>`__.
LDT it is an MPLS signaling protocol that distributes labels creating
MPLS paths in a dynamic manner. LDT is not exactly a routing protocol,
as it relies on other routing protocols for forwarding decisions.
.. cfgcmd:: set protocols mpls ldp interface <interface>
Use this command to enable LDP in 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
In order to allow the exchange of label advertisements required for LDP,
a TCP session should be established between routers. Routers will need
to learn each other's **transport address** in order to establish the
TCP session.
You may want 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 explicitely set in the configuration.
.. cfgcmd:: set protocols mpls ldp discovery transport-ipv4-address | transport-ipv6-address <address>
Use this command to set the IPv4 or IPv6 transport-address used by
LDP.
.. cfgcmd:: set protocols mpls ldp neighbor <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.
Example
-------
.. code-block:: none
set interfaces dummy dum0 address '2.2.2.2/32'
set interfaces ethernet eth1 address '10.0.0.2/24'
set interfaces ethernet eth2 address '10.0.255.1/24'
set protocols mpls ldp discovery transport-ipv4-address '2.2.2.2'
set protocols mpls ldp interface 'eth1'
set protocols mpls ldp interface 'eth2'
set protocols mpls ldp router-id '2.2.2.2'
set protocols ospf area 0 network '0.0.0.0/0'
set protocols ospf parameters router-id '2.2.2.2'
show 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:
.. 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
Uset this command to see LDP neighbor information
.. opcmd:: show mpls ldp neighbor detail
Uset this command to see detailed LDP neighbor information
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