17-18 Riverstone Networks RS Switch Router User Guide Release 8.0
RSVP Configuration MPLS Configuration
17.3.5 Blockade Aging Interval
A “killer reservation” situation occurs when an RSVP reservation request effectively denies service to any other
request. For example, an RSVP node attempting (and failing) to make a large reservation can prevent smaller
reservation requests from being forwarded and established. On the RS, when there is a reservation error, the offending
request enters a blockade state for a predetermined amount of time. While a reservation request is blockaded, smaller
requests can be forwarded and established.
On the RS, the default time that a request can be blockaded is 60 seconds. You can change this interval with the rsvp
set global blockade-aging-interval command. For example, the following command sets the blockade
interval to 50 seconds:
17.3.6 RSVP Refresh Reduction
As described previously, RSVP uses Path and Resv refresh messages to maintain states between RSVP neighbors.
Each RSVP session requires that refresh messages be generated, transmitted, received, and processed for each refresh
period. Supporting a large number of RSVP sessions presents a scaling problem as the resources required for
processing these messages increase proportionally with the number of RSVP sessions.
The RS supports the following features that can reduce the overhead required to process refresh messages on a
per-interface basis:
•Message aggregation
•Message ID extensions
The following sections describe how to configure and use these features.

RSVP Message Aggregation

The RS supports the aggregation, or bundling, of multiple RSVP messages on a per-interface basis. Message
aggregation helps to scale RSVP by reducing processing overhead and bandwidth consumption. Aggregated RSVP
messages can only be sent to RSVP neighbors that support message aggregation. Aggregated RSVP messages must
not be used if the RSVP neighbor does not support message aggregation.
RSVP message aggregation is disabled by default on the RS. You can enable message aggregation on an interface with
the aggregate-enable parameter of the rsvp set interface command. For example, the following command
enables RSVP message aggregation on the interface ‘int2’:
rsvp set global blockade-aging-interval 50
rsvp set interface int2 aggregate-enable