draft-owens-crldp-path-protection-ext-00.txt

["Ken Owens" <keno@erlangtech.com>]

Subject: MPLS draft-owens-crldp-path-protection-ext-00.txt                    
  
NAME OF I-D: 
 
http://www.ietf.org/internet-drafts/draft-owens-crldp-path-protection-ext-
00.txt

SUMMARY 
 
To deliver reliable service, multi-protocol label switching (MPLS) requires a set of procedures to enable 
protection of the traffic  carried on label switched paths (LSPs). Thus existing signaling 
mechanisms must be extended appropriately to support such  functionality.  Recently, CR-LDP has 
introduced extensions to LDP to support the establishment of LSP tunnels. This draft extends 
CR-LDP to support path protection [ ]in MPLS. Specifically, we provide signaling support for establishing 
working and backup LSPs. 
 
RELATED DOCUMENTS 

1.	Framework for MPLS-based Recovery, draft-ietf-mpls-recovery-frmwrk-02.txt
2.	Requirements for Traffic Engineering Over MPLS, RFC 2702
3.	Shared Backup Label Switched Path Restoration, draft-kini-restoration-shared-backup-00.txt
4.	RSVP Label Allocation for Backup Tunnels, draft-swallow-rsvp-bypass-label-01.txt
5.	Reservation Protocol with Traffic Engineering Extensions: Extension for Label Switched Path 
Restoration, draft-kini-rsvp-lsp-restoration-00.txt
6.	A Method for Setting an Alternative Label Switched Path to Handle Fast Reroute, draft-haskin-
mpls-fast-reroute-05.txt
7.	A Path Protection/Restoration Mechanism for MPLS Networks, draft-chang-mpls-path-protection-
02.txt
8.	Extensions to RSVP-TE for MPLS Path Protection, draft-chang-mpls-rsvpte-path-protection-ext-
01.txt
9.	Generalized Multi-Protocol Label Switching (GMPLS) Architecture, draft-many-gmpls-
architecture-00.txt
10.	Enhanced LSP Services, draft-papadimitriou-enhanced-lsps-03.txt
11.	Generalized MPLS Recovery Mechanisms, draft-lang-ccamp-recovery-00.txt
12.	Open Shortest Path First (OSPF) protocol extensions for Label Switched Path restoration, draft-
kini-ospf-lsp-restoration-00.txt
13.	ReSerVation Protocol with Traffic Engineering extensions. Extension for Label Switched Path 
restoration, draft-kini-rsvp-lsp-restoration-00.txt

WHERE DOES IT FIT IN THE PICTURE OF THE SUB-IP WORK 
 
  Applications         +-------+  +-------+        (new) Hour glass 
  that use CCAMP: \    | TE-WG |  | PPVPN |  ...           / 
                   \   +-------+  +-------+               / 
                    \     +----------------------+       / 
                     \    |         CCAMP        |      / 
                      \   |-----------+----------|     /  
                      /   |   C       |    M   --|------ IGP LSA ext 
                     /    | control   | measure  |     \  
                    /     +----------------------+      \ 
  Technologies to  / +----+ +----+ +----+ +----+ +----+  \ 
  measure/control:/  |MPLS| |OPT | |RPR | |ATM | | FR |...\ 
                     +----+ +----+ +----+ +----+ +----+ 

This work is targeted for MPLS.
 
WHY IS IT TARGETED AT THIS WG 
 
The following text is taken from the MPLS Charter goals:
"6. Specify MPLS-specific recovery mechanisms to allow one label-switched path to be used as backup for 
a set of other label-switched paths, including cases which permit local repair. What constitutes the 
necessary set of MPLS-specific recovery mechanism should be ascertained through cooperation with the 
CCAMP and TE working groups."

This draft, in conjunction with draft-chang-mpls-path-protection-02.txt, addresses MPLS WG's Charter 
Goal 6 since it specifies extensions to Cr-LDP to support path-based restoration in MPLS networks. 
 
JUSTIFICATION 
 
The justification for this document is simple, the MPLS Charter goals are to address MPLS specific 
restoration and that is exactly what this Cr-LDP extension draft provides. This is not a new work item, it 
has been worked on for the last year on the WG mailing list and discussed at IETF meetings. Once the 
approval is given to progress this draft, it will go for WG consensus, WG last call, and then progress for 
Informational RFC.