Refresh Interval Independent FRR Facility Protection
draft-ietf-mpls-ri-rsvp-frr-02

Document Type Active Internet-Draft (mpls WG)
Last updated 2017-08-11
Replaces draft-chandra-mpls-ri-rsvp-frr
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Network Working Group                              Chandra Ramachandran 
 Internet Draft                                         Juniper Networks 
 Intended status: Standards Track                              Ina Minei 
                                                             Google, Inc 
                                                           Dante Pacella 
                                                                 Verizon 
                                                              Tarek Saad 
                                                      Cisco Systems Inc. 
                                                                         
  
 Expires: February 11, 2018                              August 11, 2017 
                                     
  
                                       
            Refresh Interval Independent FRR Facility Protection 
                       draft-ietf-mpls-ri-rsvp-frr-02 

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 Internet-Draft            RI-RSVP FRR Bypass                August 2017 
     

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 Abstract 

    RSVP-TE relies on periodic refresh of RSVP messages to synchronize 
    and maintain the 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 RSVP-TE Scaling Recommendations 
    (draft-ietf-teas-rsvp-te-scaling-rec) 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. 

 Requirements Language 

    The key words "MUST", "MUST NOT", "REQUIRED", "SHALL", "SHALL NOT", 
    "SHOULD", "SHOULD NOT", "RECOMMENDED", "MAY", and "OPTIONAL" in this 
    document are to be interpreted as described in RFC-2119 [RFC2119]. 
     
  
  
  
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