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Merge pull request #2568 from pguibert6WIND/doc_mpls

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doc: add MPLS configuration commands
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Quentin Young 2018-07-05 14:56:34 -04:00 committed by GitHub
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@ -521,6 +521,94 @@ entered within the VRF context the static routes are created in the VRF.
show ip table vrf r1-cust1 table 43
.. _zebra-mpls:
MPLS Commands
=============
You can configure static mpls entries in zebra. Basically, handling MPLS
consists of popping, swapping or pushing labels to IP packets.
MPLS Acronyms
-------------
:abbr:`LSR (Labeled Switch Router)`
Networking devices handling labels used to forward traffic between and through
them.
:abbr:`LER (Labeled Edge Router)`
A Labeled edge router is located at the edge of an MPLS network, generally
between an IP network and an MPLS network.
MPLS Push Action
----------------
The push action is generally used for LER devices, which want to encapsulate
all traffic for a wished destination into an MPLS label. This action is stored
in routing entry, and can be configured like a route:
.. index:: [no] ip route NETWORK MASK GATEWAY|INTERFACE label LABEL
.. clicmd:: [no] ip route NETWORK MASK GATEWAY|INTERFACE label LABEL
NETWORK ans MASK stand for the IP prefix entry to be added as static
route entry.
GATEWAY is the gateway IP address to reach, in order to reach the prefix.
INTERFACE is the interface behind which the prefix is located.
LABEL is the MPLS label to use to reach the prefix abovementioned.
You can check that the static entry is stored in the zebra RIB database, by
looking at the presence of the entry.
::
zebra(configure)# ip route 1.1.1.1/32 10.0.1.1 label 777
zebra# show ip route
Codes: K - kernel route, C - connected, S - static, R - RIP,
O - OSPF, I - IS-IS, B - BGP, E - EIGRP, N - NHRP,
T - Table, v - VNC, V - VNC-Direct, A - Babel, D - SHARP,
F - PBR,
> - selected route, * - FIB route
S>* 1.1.1.1/32 [1/0] via 10.0.1.1, r2-eth0, label 777, 00:39:42
MPLS Swap and Pop Action
------------------------
The swap action is generally used for LSR devices, which swap a packet with a
label, with an other label. The Pop action is used on LER devices, at the
termination of the MPLS traffic; this is used to remove MPLS header.
.. index:: [no] mpls lsp INCOMING_LABEL GATEWAY OUTGOING_LABEL|explicit-null|implicit-null
.. clicmd:: [no] mpls lsp INCOMING_LABEL GATEWAY OUTGOING_LABEL|explicit-null|implicit-null
INCOMING_LABEL and OUTGOING_LABEL are MPLS labels with values ranging from 16
to 1048575.
GATEWAY is the gateway IP address where to send MPLS packet.
The outgoing label can either be a value or have an explicit-null label header. This
specific header can be read by IP devices. The incoming label can also be removed; in
that case the implicit-null keyword is used, and the outgoing packet emitted is an IP
packet without MPLS header.
You can check that the MPLS actions are stored in the zebra MPLS table, by looking at the
presence of the entry.
.. index:: show mpls table
.. clicmd:: show mpls table
::
zebra(configure)# mpls lsp 18 10.125.0.2 implicit-null
zebra(configure)# mpls lsp 19 10.125.0.2 20
zebra(configure)# mpls lsp 21 10.125.0.2 explicit-null
zebra# show mpls table
Inbound Outbound
Label Type Nexthop Label
-------- ------- --------------- --------
18 Static 10.125.0.2 implicit-null
19 Static 10.125.0.2 20
21 Static 10.125.0.2 IPv4 Explicit Null
.. _multicast-rib-commands:
Multicast RIB Commands