2. 1 © 2002, Cisco Systems, Inc. All rights reserved. draft-nadeau-pwe3-vccv-00.txt IETF #56 San Francisco, CA USA Thomas D. Nadeau tnadeau@cisco.com Monique Morrow Mmorrow@cisco.com George Swallow Swallow@cisco.com ftp://ftp-eng.cisco.com/tnadeau/oam/draft-nadeau- pwe3-vccv-00.txt

3. 2 © 2002, Cisco Systems, Inc. All rights reserved. Based on MPLS OAM and Customer Requirements Driven by a need to provide a common means of testing PWEs using an in-band diagnostic mechanism. ftp://ftp-eng.cisco.com/tnadeau/oam/draft- nadeau-mpls-oam-requirements-00.txtftp://ftp-eng.cisco.com/tnadeau/oam/draft- nadeau-mpls-oam-requirements-00.txt Soon to be draft-ietf-mpls-oam-requirements- 00.txt

4. 3 © 2002, Cisco Systems, Inc. All rights reserved. Motivation One transport tunnel can serve many pseudo-wires and we can verify that path with existing tools… (e.g.: MPLS ping is sufficient to monitor the PSN tunnel for PE-PE connectivity, but not VCs inside of tunnel.) But…we cannot verify the PWs themselves using existing tools.

5. 4 © 2002, Cisco Systems, Inc. All rights reserved. VCCV Key Points Provides extensible foundation for PW OAM CV/trace functions. Will work with supported transport tunnels MPLS and L2TPv3 (soon) Different CV types to support different PWs when appropriate LSP Ping, IP Ping, VPLS (future)

6. 5 © 2002, Cisco Systems, Inc. All rights reserved. VCCV Key Points (2) Modify PWE Encapsulation Header Some reserved bit for OAM indication. Current bit in draft is already assigned; need to choose a new one. Capability Signaled During VC setup as a bit mask of allowable VCCV types. Carry multiple TLVs as payload to allow for different types of OAM operations. Support MPLS and L2TPv3 transports Support p2p and VPLS applications Straight-forward to implement. Reference ftp://ftp-eng.cisco.com/tnadeau/oam/draft- nadeau-pwe3-vccv-00.txt

7. 6 © 2002, Cisco Systems, Inc. All rights reserved. Example of Operation CV/Trace Using VCCV and LSP Ping Attachment VC VCCV Packet Is lost Attachment VC NMS/mgr Triggers VCCV NMS/mgr Triggers LSP ping trace when failure detected

8. 7 © 2002, Cisco Systems, Inc. All rights reserved. Open Issues As currently defined VCCV parameter does NOT need to be identical in both directions of a circuit, so no cases where the signaling MUST be rejected In order to support certain functions in future one might want to reject a setup (e.g. the far end did not indicate Ping, but I'm configured to do CV with Ping). The description of signaling is incorrect. Needs to be single sided (downstream unsolicited). Need to add VCCV type for L2TPv3 Current bit in draft is already assigned; need to choose a new one

9. 8 © 2002, Cisco Systems, Inc. All rights reserved. Next Steps Refinements Support L2TPv3 transport. Editorial enhancements. Accept as a PWE3 WG document.

10. 9 © 2002, Cisco Systems, Inc. All rights reserved. Thank You