Prerequisites For Implementing Rsvp For Mpls-Te; Information About Implementing Rsvp For Mpls-Te; Overview Of Rsvp For Mpls-Te - Cisco ASR 9000 Series Configuration Manual
Aggregation services router mpls
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- Command reference manual (1138 pages) ,
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Prerequisites for Implementing RSVP for MPLS-TE
Prerequisites for Implementing RSVP for MPLS-TE
These prerequisites are required to implement RSVP for MPLS-TE :
• You must be in a user group associated with a task group that includes the proper task IDs. The command
• Either a composite mini-image plus an MPLS package, or a full image, must be installed.
Information About Implementing RSVP for MPLS-TE
To implement MPLS RSVP, you must understand the these concepts:
Related Topics
How to Implement RSVP Authentication, on page 84
Overview of RSVP for MPLS-TE
RSVP is a network control protocol that enables Internet applications to signal LSPs for MPLS-TE . The
RSVP implementation is compliant with the IETF RFC 2205, and RFC 3209.
RSVP is automatically enabled on interfaces on which MPLS-TE is configured. For MPLS-TE LSPs with
nonzero bandwidth, the RSVP bandwidth has to be configured on the interfaces. There is no need to configure
RSVP, if all MPLS-TE LSPs have zero bandwidth .
RSVP Refresh Reduction, defined in RFC 2961, includes support for reliable messages and summary refresh
messages. Reliable messages are retransmitted rapidly if the message is lost. Because each summary refresh
message contains information to refresh multiple states, this greatly reduces the amount of messaging needed
to refresh states. For refresh reduction to be used between two routers, it must be enabled on both routers.
Refresh Reduction is enabled by default.
Message rate limiting for RSVP allows you to set a maximum threshold on the rate at which RSVP messages
are sent on an interface. Message rate limiting is disabled by default.
The process that implements RSVP is restartable. A software upgrade, process placement or process failure
of RSVP or any of its collaborators, has been designed to ensure Nonstop Forwarding (NSF) of the data plane.
RSVP supports graceful restart, which is compliant with RFC 3473. It follows the procedures that apply when
the node reestablishes communication with the neighbor's control plane within a configured restart time.
It is important to note that RSVP is not a routing protocol. RSVP works in conjunction with routing protocols
and installs the equivalent of dynamic access lists along the routes that routing protocols calculate. Because
of this, implementing RSVP in an existing network does not require migration to a new routing protocol.
Related Topics
Configuring RSVP Packet Dropping, on page 78
Set DSCP for RSVP Packets: Example, on page 101
Verifying RSVP Configuration, on page 80
Cisco ASR 9000 Series Aggregation Services Router MPLS Configuration Guide, Release 4.3.x
64
reference guides include the task IDs required for each command. If you suspect user group assignment
is preventing you from using a command, contact your AAA administrator for assistance.
Implementing RSVP for MPLS-TE
OL-28381-02
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