1. Pseudo Wire (PW) Virtual Circuit Connection Verification (VCCV) Update Thomas D. Nadeau Cisco Systems, Inc Rahul Aggarwal (Presenter) Juniper Networks

2. Slide 2 Contributors Thomas D. Nadeau (Cisco) Rahul Aggarwal (Juniper) George Swallow (Cisco) Monique Morrow (Cisco) Yuchi Ikejiri (NTT) Kenji Kumaki (KDDI) Thomas D. Nadeau (Cisco) Rahul Aggarwal (Juniper) George Swallow (Cisco) Monique Morrow (Cisco) Yuchi Ikejiri (NTT) Kenji Kumaki (KDDI)

3. Slide 3 Overview MPLS as PSN –Inband MPLS VCCV –Router Alert Label L2TPv3 as PSN OAM capability advertisement Conclusion MPLS as PSN –Inband MPLS VCCV –Router Alert Label L2TPv3 as PSN OAM capability advertisement Conclusion

4. Slide 4 MPLS as PSN Inband MPLS VCCV –First nibble of the 4 byte PW Control header is 0001 –LS 16 bits specify the Protocol Number Router alert label can be used to indicate an OAM flow –If hardware cannot support the PW control header ICMP Ping or LSP-Ping packets L2 Circuit ID TLV in LSP Ping indicates PW ID Type –VCID –Attachment Identifier Inband MPLS VCCV –First nibble of the 4 byte PW Control header is 0001 –LS 16 bits specify the Protocol Number Router alert label can be used to indicate an OAM flow –If hardware cannot support the PW control header ICMP Ping or LSP-Ping packets L2 Circuit ID TLV in LSP Ping indicates PW ID Type –VCID –Attachment Identifier

5. Slide 5 L2TPv3 as PSN L2TPv3 VCCV verifies the session forwarding state at the egress PE L2TPv3 VCCV message encoded in the session data packet –Indicated by setting the ‘V’ bit in the default L2-specific sub-layer format: Bit 4 L2TPv3 VCCV message contains a VCCV AVP L2TPv3 VCCV verifies the session forwarding state at the egress PE L2TPv3 VCCV message encoded in the session data packet –Indicated by setting the ‘V’ bit in the default L2-specific sub-layer format: Bit 4 L2TPv3 VCCV message contains a VCCV AVP

6. Slide 6 L2TPv3 VCCV AVP Encodes the LSP Ping header Message type is: –1. L2TPv3 VCCV Echo Request –2. L2TPv3 VCCV Echo Reply Reply Mode: –Do Not Reply –Reply using L2TPv3 session Contains the L2 Circuit ID TLV –Includes Remote End Identifier AVP to identify the PW Encodes the LSP Ping header Message type is: –1. L2TPv3 VCCV Echo Request –2. L2TPv3 VCCV Echo Reply Reply Mode: –Do Not Reply –Reply using L2TPv3 session Contains the L2 Circuit ID TLV –Includes Remote End Identifier AVP to identify the PW

7. Slide 7 OAM Capability Advertisement OAM capability must be signaled before a PE may send OAM messages MPLS as PSN –LDP signaling: PE can indicate the OAM type in the VCCV parameter in the VC FEC TLV –BGP signaling: TBD L2TPv3 as PSN –VCCV capability AVP in the control messages VCCV control channel decided by the receiving PE OAM capability must be signaled before a PE may send OAM messages MPLS as PSN –LDP signaling: PE can indicate the OAM type in the VCCV parameter in the VC FEC TLV –BGP signaling: TBD L2TPv3 as PSN –VCCV capability AVP in the control messages VCCV control channel decided by the receiving PE

8. Slide 8 Conclusion Leave the L2 Circuit ID TLV in LSP-Ping ? OAM capability advertisement for BGP signaling: Action Item Request to be a WG Document Leave the L2 Circuit ID TLV in LSP-Ping ? OAM capability advertisement for BGP signaling: Action Item Request to be a WG Document

9. Thank You! rahul@juniper.net http://www.juniper.net