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Staged refresh timers for RSVP

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2 Author(s)
Ping Pan ; IBM Thomas J. Watson Res. Center, Yorktown Heights, NY, USA ; Schulzrinne, Henning

The current resource reservation protocol (RSVP) design has no reliability mechanism for the delivery of control messages. Instead, RSVP relies on periodic refresh between routers to maintain reservation states. This approach has several problems in a congested network. End systems send PATH and RESV messages to set up RSVP connections. If the first PATH or RESV message from an end system is accidentally lost in the network, a copy of the message will not be retransmitted until the end of a refresh interval, causing a delay of 30 seconds or more until a reservation is established. If a congested link reuses a tear-down message (PATHTEAR or RESVTEAR) to be dropped, the corresponding reservation will not be removed from the routers until the RSVP cleanup timer expires. We present an RSVP enhancement called staged refresh timers to support fast and reliable message delivery that ensures hop-by-hop delivery of control messages without violating the soft-state design. The enhancement is backwards-compatible and can be easily added to current implementations. The new approach can speed up the delivery of trigger messages while reducing the amount of refresh messages. The approach is also applicable to other soft-state protocols

Published in:

Global Telecommunications Conference, 1997. GLOBECOM '97., IEEE  (Volume:3 )

Date of Conference:

3-8 Nov 1997

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