1. IETF80, Prague1 LDP Extensions for Optimized MAC Address Withdrawal in VPLS model 3 supporting Qualified learning draft-chen-l2vpn-vpls-mac-opt-qualified-01 Ran Chen Yubao Wang Liang Guo 2011-3-29

2. Introduction This draft describes a problem and a solution to optimize the MAC flush procedure in VPLS model 3 ([RFC4664] )supporting qualified learning ([RFC4762]). IETF80, Prague22011-3-29

3. Problem statement （ I ） There are two MAC address withdraw mechanisms in IETF. –RFC4762 –Draft-ietf-l2vpn-vpls-ldp-mac-opt Comparison of the existing MAC address withdraw mechanism 2011-3-29IETF80, Prague3 MechanismComparison RFC4762The basic MAC address withdraw mechanism in VPLS. Draft-ietf-l2vpn-vpls- ldp-mac-opt Extend RFC4762 to Optimize MAC address withdraw in H-VPLS.

4. Problem statement （ II ） As per the processing rules defined in both RFC4762 and Draft- ietf-l2vpn-vpls-ldp-mac-opt,PEs flush the MAC address belonging to the unaffected MAC address in qualified learning model. 2011-3-29IETF80, Prague4 Figure1: MAC address withdraw mechanism defines in existing drafts

5. Solutions(I) Use of optional MAC Address Space TLV in LDP Address Withdraw Message. MAC Address Space TLV 2011-3-29IETF80, Prague5

6. Solutions （ II ） As per the processing rules defined in this draft. Only MAC addresses belonging to VLAN1 and learned over the PW that terminates at PE1 be removed. 2011-3-29IETF80, Prague6 Figure2: MAC address withdraw mechanism defines in this draft

7. Benefits Quick convergence Narrows the scope of MAC address flush. –When PEs receive the message with MAC Address Space TLV, they flush only the MAC addresses belonging to the MAC address space affected by topology change. 2011-3-29IETF80, Prague7

8. Next Step The authors would like to request more WG feedbacks Thank you IETF80, Prague82011-3-29