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17-12 Riverstone Networks RS Switch Router User Guide Release 8.0
Enabling and Starting MPLS on the RS MPLS Configuration
In the above example, RSVP is enabled on the interface ‘int1’. No RSVP processing occurs on the router until RSVP
is started with the
rsvp start
command and no LSP creation occurs until MPLS is enabled and started. You can
optionally configure RSVP, using the
rsvp set
commands, before starting RSVP. For more information about
configuring RSVP, see Section 17.3, "RSVP Configuration."
LSRs can also use LDP to distribute labels and their meanings to LDP peers. LDP enables LSR peers to find each other
and establish communications. The following CLI commands enable LDP on the RS:
In the above example, LDP is enabled on the interfaces ‘int2’. No LDP processing occurs on the router until LDP is
started with the
ldp start
command and no LSP creation occurs until MPLS is enabled and started. You can
optionally configure LDP, using other
ldp
commands, before starting LDP. For more information about configuring
LDP, see Section 17.4, "LDP Configuration."
You cannot enable both RSVP and LDP on the same interface on the router, however you can run RSVP and LDP on
the same router. For example, a router that is an ingress router for an LSP through a core network might use RSVP
signaling on the interface to the core network. The same router can act as a tunnel entry point, through a different
interface, for LDP-signaled LSPs.
LDP and RSVP each generate signaling traffic to establish and maintain LSPs. In general, you should not enable LDP,
RSVP, or MPLS on interfaces where they will not be used. For example, issuing the
rsvp add interface all
and
mpls add interface all
commands is an expedient way to enable RSVP and MPLS on all router interfaces.
However, if you are using MPLS on a handful of interfaces only, this creates an unnecessary amount of processing
overhead and signaling traffic.
! Enable LDP on router interfaces
ldp add interface int2
! Start LDP on the router
ldp start