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VPLS PE Model with E-Tree Support

VPLS PE Model with E-Tree Support. draft-jiang-l2vpn-vpls-etree-pe-00.txt. Yuanlong Jiang ( yljiang@huawei.com ). E-Tree Requirements on VPLS. E-Tree Service An EVC service defined in MEF (MEF 6.1, MEF 10.2) Rooted Multipoint EVC (Multi-root possible), each UNI is either Root or Leaf

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VPLS PE Model with E-Tree Support

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  1. VPLS PE Model with E-Tree Support draft-jiang-l2vpn-vpls-etree-pe-00.txt Yuanlong Jiang (yljiang@huawei.com) 77th IETF - Anahaim

  2. E-Tree Requirements on VPLS • E-TreeService • An EVC service defined in MEF (MEF 6.1,MEF 10.2) • Rooted Multipoint EVC (Multi-root possible), each UNI is either Root or Leaf • Connectivity: Root to Leaf, Leaf to Root, Root to Root • Prohibited: Leaf to Leaf • Problems • VPLS is based on full mesh connectivity, how to provide E-Tree service in VPLS and guarantee the segregation between the leaves when E-Tree is a multi-rooted tree? • History • 2009.09, problem of E-Tree in PBB-VPLS first raised in BBF • 2009.10, two I-Ds proposed to solve the general problem of E-Tree in VPLS in IETF • 2010.01, two presentations discussed to solve the problem of E-Tree in Ethernet in IEEE 77th IETF - Anahaim

  3. E-Tree Challenges in VPLS CE Leaf Leaf Root UNI CE UNI UNI CE Leaf UNI Leaf Root CE UNI UNI CE UNI CE Leaf CE How to provide E-Tree service with scalability in the MPLS/VPLS network? How to do Leaf segregation when PE dual feed both Root & Leaf? 77th IETF - Anahaim

  4. E-Tree Scheme in IEEE • Asymmetric VLAN (IEEE 802.1Q) • Root/Leafattached to bridge in untaggedmode • Configure PVID and member set for each access port • Stephen Haddock proposed to use only a pair of Trunk VLAN and Branch VLAN for muti-root E-Tree, this capability is anticipated to be provided in future revisions of 802.1Q Server Member Sets: Red – Port 1, 2 Blue – Port 3 Green-Port 3 Untagged Sets: Red – Port 1, 2 Blue – Port 3 Green-Port 3 R Port3 PVID=3 PVID=2 Port2 PVID=1 Port1 L L 77th IETF - Anahaim

  5. VPLS PE Model Defined in IETF (Model 2) draft-ietf-l2vpn-vpls-bridge-interop-04 CE AC C PW CVLAN Bridge S-VLAN-1 VSI C SVLAN Bridge C PW CVLAN Bridge S-VLAN-2 VSI C VPLS PE Model VPLSPE Model (802.1ad)with 2 stages of bridge - a typical implementation 77th IETF - Anahaim

  6. A Model 2 Compatible E-Tree Scheme CE AC R PW CVLAN Bridge Root VLAN VSI L SVLAN Bridge R PW CVLAN Bridge VSI Leaf VLAN L VPLS PEModel – 2 VSI per E-Tree 2 VSIs and 2 sets of PWs are needed per E-Tree if we incorporate the enhanced Asymmetric VLAN into the VPLS PE model 2 77th IETF - Anahaim

  7. Enhanced Model 2 (Tree VSI) Bridge 2 S-VLANsinto Tree VSI CE AC R PW Root CVLAN Bridge T-VSI Leaf L SVLAN Bridge R PW CVLAN Bridge S-VLAN-2 VSI L Enhanced VPLS PE • Tree VSI (T-VSI) attached to S-VLAN bridge with Root VLANand Leaf VLAN, and work in shared VLAN learning • Traffic from Root or LeafUNI distributed into Root VLANand Leaf VLAN • Only one T-VSI and one set of PWs needed per E-Tree 77th IETF - Anahaim

  8. Interconnection Scenario CE PE1 AC R PW Root SVLAN Bridge CVLAN Bridge T-VSI Leaf L R PW Root CVLAN Bridge SVLAN Bridge T-VSI L Leaf PE2 PE Interconnection with T-VSI • Either PE1 or PE2 can do VLAN translation (either when enter or exit PW) • Bridge module filters Leaf VLAN traffic on the egress Leaf port 77th IETF - Anahaim

  9. PW Processing • PW works in Taggedmode • At least one end of PEprovided with the VLAN mapping capability • Remote Root VLAN <-> Local Root VLAN • Remote Leaf VLAN <-> Local Leaf VLAN • At the PW ingress, Root or Leaf VLAN encapsulated in the same PW and transparently label switched • At the PW egress, Ethernet frames translated into Local Root or Leaf VLAN 77th IETF - Anahaim

  10. Extension of LDP Protocol • E-Tree sub-TLV is defined as one of interface parameters • PEs negotiate their supports of E-Tree (T-VSI) when the PW is set up • Root VLAN ID and Leaf VLAN ID carried in the sub-TLV • P bit indicate that PE is attached with “Pure Leaves” • R bit is a request flag for “Remote VLAN Translation” 0 1 2 3 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 2 3 4 5 6 7 8 9 0 1 +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | E-Tree | Length=8 | Reserved |P|R| +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ | Root VLAN ID | Leaf VLAN ID | +-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+-+ 77th IETF - Anahaim

  11. Next Step • The authors would like to request more WG feedbacks 77th IETF - Anahaim

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