LDP Extensions for Optimized MAC Address Withdrawal in
- Slides: 8
LDP Extensions for Optimized MAC Address Withdrawal in VPLS model 3 supporting Qualified learning draft-chen-l 2 vpn-vpls-mac-opt-qualified-01 Ran Chen Yubao Wang Liang Guo 2011 -3 -29 IETF 80, Prague 1
Introduction • This draft describes a problem and a solution to optimize the MAC flush procedure in VPLS model 3 ([RFC 4664] )supporting qualified learning ([RFC 4762]). 2011 -3 -29 IETF 80, Prague 2
Problem statement（I） • There are two MAC address withdraw mechanisms in IETF. – RFC 4762 – Draft-ietf-l 2 vpn-vpls-ldp-mac-opt • Comparison of the existing MAC address withdraw mechanism Mechanism Comparison RFC 4762 The basic MAC address withdraw mechanism in VPLS. Draft-ietf-l 2 vpn-vplsldp-mac-opt Extend RFC 4762 to Optimize MAC address withdraw in H-VPLS. 2011 -3 -29 IETF 80, Prague 3
Problem statement（II） Figure 1: MAC address withdraw mechanism defines in existing drafts • As per the processing rules defined in both RFC 4762 and Draftietf-l 2 vpn-vpls-ldp-mac-opt , PEs flush the MAC address belonging to the unaffected MAC address in qualified learning model. 2011 -3 -29 IETF 80, Prague 4
Solutions(I) • Use of optional MAC Address Space TLV in LDP Address Withdraw Message. • MAC Address Space TLV 2011 -3 -29 IETF 80, Prague 5
Solutions（II） Figure 2: MAC address withdraw mechanism defines in this draft • As per the processing rules defined in this draft. Only MAC addresses belonging to VLAN 1 and learned over the PW that terminates at PE 1 be removed. 2011 -3 -29 IETF 80, Prague 6
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 -29 IETF 80, Prague 7
Next Step • The authors would like to request more WG feedbacks Thank you 2011 -3 -29 IETF 80, Prague 8
