Reservation Message; Path Error Message; Reservation Error Message; Path Tear Message - Extreme Networks BlackDiamond 6800 MPLS Installation And User Manual

Configuring RSVP-TE

Reservation Message

Each receiver host transmits an RSVP reservation request to its upstream neighbor.
Reservation messages follow the reverse path that the data packets use. The reservation
message creates and maintains a reservation state in each node on the path.
Reservation messages are eventually delivered to the sender, so that the sender can
configure appropriate traffic control parameters for the first hop node.

Path Error Message

The path error message is used to report errors that are encountered when processing
path or reservation messages. Path error messages travel upstream towards the sender.
Path error messages do not modify the state of any node; they are only reported to the
sender.

Reservation Error Message

The reservation error message is used to report errors that are encountered when
processing reserve messages. In addition, reservation error messages are used to report
the spontaneous disruption of a reservation. Reservation error messages travel
downstream to the receiver.

Path Tear Message

The path tear message is used to delete a matching path state. When used for a
multicast session, path tear messages can only match the path state for the incoming
interface on which the path tear message arrived. If there is no matching path state, the
path tear message is discarded.
Path tear messages are initiated by senders or by the expiration of the path state
timeout. Path tear messages travel downstream towards all receivers. The routing of a
path tear message is identical to the corresponding path message.
When a path state is deleted as the result of the path tear message, the related
reservation state must also be adjusted to maintain consistency in the node. The
adjustment depends on the reservation style.
5-4 MPLS Module Installation and User Guide