1. Update on LDP Extensions for Optimized MAC Address Withdrawal in H-VPLS draft-ietf-l2vpn-vpls-ldp-mac-opt-03

2. Authors Geraldine Calvignac – France Telecom
Olen Stokes - Extreme Networks
Pranjal Kumar Dutta, Florin Balus - Alcatel-Lucent

3. Background - draft-ietf-l2vpn-vpls-ldp-mac-opt
Optimize, extend LDP MAC Flush to address existing LDP VPLS deployments, including PBB-VPLS use cases
Two components
Minimizes the MAC addresses that need to be relearned
Provides required extensions for PBB VPLS case
draft-ietf-l2vpn-vpls-ldp-mac-opt-02 – submitted for IETF-78
Added draft-balus-l2vpn-pbb-ldp-ext-02 text as agreed in IETF-77
PBB VPLS extensions – propagate CMAC flush transparently through the B-VPLS; avoid unnecessary BMAC flushing
Existing enhancements apply also to PBB-VPLS

4. MAC Optimization benefits
Flush-all-from-me benefit: optimized MAC Flush, less flooding - flush only the MACs associated with PW13 M1
ALL other MACs in the FIB
IP/MPLS
PE1
MTU/CE
PE2
PE3
NTU
VSI
Primary PW
Standby PW
1. PW failure X
PW12
PW23
PW13 M1 M2
Flush-all-but-mine (RFC4762): flush all the MACs except the MACs learned from PE2
ALL other MACs in the FIB M2

5. MAC Optimization for LDP VPLS – use case described in version 02
4. Flush only MACs learned over PW13
PE1
Primary PW
VSI
1. PW failure
PW13 M1 X
PE3
VSI
NTU
MTU
IP/MPLS
PW12
3. T-LDP MAC Withdraw with PE-ID1 TLV
PW23
1. T-LDP MAC Withdraw with PE-ID1 TLV M1
Standby PW
PE2
VSI
2. Flush only MACs learned over PW12
HVPLS resiliency using A/S PWs

6. What’s new in draft-ietf-l2vpn-vpls-ldp-mac-opt-03?
PE1
Primary
VSI
1. Link failure X
PW13
PE3
VSI
NTU
MTU/CE
IP/MPLS
PW12
PW23
Standby
PE2
VSI
Solution expanded to address the native Ethernet access
Applicable to any non-STP based resiliency scheme

7. Proposed solution addressing the native Ethernet access scenario
1. T-LDP MAC Withdraw (N=1)
2. Flush only MACs learned over PW13
PE1
Primary
VSI
1. Link failure M1 X
PW13
PE3
VSI
NTU
MTU/CE
IP/MPLS
PW12
PW23 M1
Standby
PE2
VSI
2. Flush only MACs learned over PW12
Use the N-Flag from MAC Flush parameters TLV: N=1 indicates Flush“all-from- me” is required – re-uses the method proposed before for PBB-VPLS
May be used also for A/S PW scenario

8. Next steps
Propose we consolidate the procedures: re-use the method based on N Flag for HVPLS with A/S PW
Simplifies the implementation
Eliminates LDP MAC Flush propagation in PE2
Faster MAC Flush on PE3 – LDP indication coming directly from PE1

9. Questions? Comments?