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Riverstone Networks RS Switch Router User Guide Release 8.0 17-13
MPLS Configuration RSVP Configuration
17.3 RSVP CONFIGURATION
Network hosts use the Resource Reservation Protocol (RSVP) to request certain qualities of service from the network
for application data flows. Routers also use RSVP to deliver quality of service (QoS) requests to all nodes on the path
of a data flow, and to establish and maintain refresh states to provide the requested service. Resources, such as link
bandwidth, are reserved on each node along a data path as a result of RSVP requests.
RSVP makes reservations for unidirectional data flows, that is, resource requests are made in only one direction. RSVP
senders are distinct from receivers, although an application can be both an RSVP sender and receiver at the same time.
RSVP operates on top of IP, however it does not transport application data and is only concerned with the QoS of the
packets that are forwarded. RSVP is designed to operate with unicast and multicast routing protocols: the routing
protocols determine where packets are forwarded, while the RSVP process consults local routing tables to obtain
routes.
Note
RSVP on the RS supports dynamic signaling for MPLS LSPs only. It does not
support IP multicast sessions, or resource reservations for real-time audio or video
flows.
Note
You must configure the router identifier on the LSR with the
ip-router global
set router-id
command.
You must enable both RSVP and MPLS on each router interface on which you want RSVP to run. You also need to
enable a unicast routing protocol (for example, OSPF) on the same interface; otherwise, LSPs may not be established
between an egress router and all ingress routers. RSVP can be enabled on all router interfaces or on specific router
interfaces, as described in Section 17.2, "Enabling and Starting MPLS on the RS." The following configuration
commands enable and start RSVP and MPLS on the router interface
to_r1
on the RS:
Note
You should not enable LDP, RSVP, or MPLS on interfaces where they will not be
used, as this creates an unnecessary amount of processing overhead and signaling
traffic.
rsvp add interface to_r1
rsvp start
mpls add interface to_r1
mpls start