[mpls] I-D Action: draft-ietf-mpls-ri-rsvp-frr-06.txt
internet-drafts@ietf.org Thu, 20 June 2019 13:00 UTC
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Subject: [mpls] I-D Action: draft-ietf-mpls-ri-rsvp-frr-06.txt
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A New Internet-Draft is available from the on-line Internet-Drafts directories. This draft is a work item of the Multiprotocol Label Switching WG of the IETF. Title : Refresh-interval Independent FRR Facility Protection Authors : Chandra Ramachandran Tarek Saad Ina Minei Dante Pacella Filename : draft-ietf-mpls-ri-rsvp-frr-06.txt Pages : 25 Date : 2019-06-20 Abstract: RSVP-TE relies on periodic refresh of RSVP messages to synchronize and maintain the Label Switched Path (LSP) related states along the reserved path. In the absence of refresh messages, the LSP-related states are automatically deleted. Reliance on periodic refreshes and refresh timeouts are problematic from the scalability point of view. The number of RSVP-TE LSPs that a router needs to maintain has been growing in service provider networks and the implementations should be capable of handling increase in LSP scale. RFC 2961 specifies mechanisms to eliminate the reliance on periodic refresh and refresh timeout of RSVP messages, and enables a router to increase the message refresh interval to values much longer than the default 30 seconds defined in RFC 2205. However, the protocol extensions defined in RFC 4090 for supporting Fast ReRoute (FRR) using bypass tunnels implicitly rely on short refresh timeouts to cleanup stale states. In order to eliminate the reliance on refresh timeouts, the routers should unambiguously determine when a particular LSP state should be deleted. Coupling LSP state with the corresponding RSVP-TE signaling adjacencies as recommended in RFC 8370 will apply in scenarios other than RFC 4090 FRR using bypass tunnels. In scenarios involving RFC 4090 FRR using bypass tunnels, additional explicit tear down messages are necessary. Refresh-interval Independent RSVP FRR (RI-RSVP-FRR) extensions specified in this document consists of procedures to enable LSP state cleanup that are essential in scenarios not covered by procedures defined in RSVP-TE Scaling Recommendations. Hence, this document updates the procedures defined in RFC 4090 to support Refresh-interval Independent RSVP (RI-RSVP) capability specified in RFC 8370. The IETF datatracker status page for this draft is: https://datatracker.ietf.org/doc/draft-ietf-mpls-ri-rsvp-frr/ There are also htmlized versions available at: https://tools.ietf.org/html/draft-ietf-mpls-ri-rsvp-frr-06 https://datatracker.ietf.org/doc/html/draft-ietf-mpls-ri-rsvp-frr-06 A diff from the previous version is available at: https://www.ietf.org/rfcdiff?url2=draft-ietf-mpls-ri-rsvp-frr-06 Please note that it may take a couple of minutes from the time of submission until the htmlized version and diff are available at tools.ietf.org. Internet-Drafts are also available by anonymous FTP at: ftp://ftp.ietf.org/internet-drafts/
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