Riverstone Networks WICT1-12 - Manual (Page 327)

Riverstone Networks RS Switch Router User Guide Release 8.0 17-19
MPLS Configuration RSVP Configuration
If message aggregation is enabled on an interface, traffic headed to a specific destination is aggregated at 5-second
intervals. You can change this interval with the
rsvp set global bundle-interval
command. For example, the
following command sets RSVP message aggregation to 7-second intervals:
Message ID Extensions
The RS supports message ID extensions, as defined by RFC 2961. These message IDs are generated and processed
over a single hop between RSVP neighbors. Enabling message ID extensions provides the following functions:
• Summary refresh allows RSVP neighbors to readily identify unchanged messages, thereby reducing
refresh message processing. An unchanged message is a message that represents a
previously-advertised state, contains the same information as a previously-transmitted message, and
is sent over the same path.
• Use of acknowledgements between RSVP neighbors to detect message loss and to support reliable
RSVP message delivery.
RSVP message ID extensions are disabled by default on the RS. You can enable message ID extensions on an interface
with the
msgid-extensions-enable
parameter of the
rsvp set interface
command. For example, the
following command enables RSVP message ID extensions on the interface ‘int2’:
Summary refresh is used to refresh Path and Resv states without transmitting standard Path or Resv messages.
Summary refresh is the periodic transmittal of a list of the message IDs associated with states that were previously
advertised in Path or Resv messages. The message ID list reduces the amount of information that must be transmitted
and processed in order to maintain RSVP state synchronization. By default, the message ID list is sent at 3-second
intervals if message ID extensions are enabled for an interface. You can change this interval with the
rsvp set
global msgid-list-interval
command. For example, the following command sets the transmission of the
message ID list to 5-second intervals:
Acknowledgements are sent between RSVP neighbors that support message ID extensions. When message ID
extensions are enabled, acknowledgements are sent for RSVP messages that advertise state or any other information
that was not previously transmitted. Message acknowledgements can be sent in any RSVP message that has an IP
destination address that matches the original message generator. Or, the acknowledgement can be sent in a separate
acknowledgement message, if no appropriate RSVP message is available. If an acknowledgement is delayed, the
corresponding message is retransmitted. To avoid retransmission, the acknowledgement should be sent at minimal
rsvp set global bundle-interval 7
rsvp set interface int2 msgid-extensions-enable
rsvp set global msgid-list-interval 5