1、Click to edit Master title styleClick to edit Master subtitle styleCopyright 2004 Juniper Networks, Inc. Proprietary and Confidential 179th IETF - Beijing 1VPLS PE Model with E-Tree Support Yuanlong Jiang () Lucy Yong () Manuel Paul (manuel.paultelekom.de) Frederic Jounay (frederic.jounayorange-)dr
2、aft-jiang-l2vpn-vpls-etree-pe-02.txtBackgrounds E-Tree Requirements in multiple SDOs Service Definition: MEF 6.1, MEF 10.2 Mobile backhaul: MEF 22 Broadband Network Architecture: BBF WT-145 MPLS in Carrier Ethernet: BBF WT-224 Lack of E-Tree support in VPLS standard Non-standard mechanism for single
3、 root topology Single VSI + extended split horizon mechanism No VPLS support for multi-roots topology Multiple nodes with root optionalPWPWCECE79th IETF - Beijing IETF - BeijingE-Tree Solution in Ethernet IEEE uses a pair of SVLANs - Trunk SVLAN and Branch SVLAN to support generic E-Tree, which is i
4、ncorporated in the latest IEEE 802.1Q standardUNIRootLeafRootLeafTrunkBranchMEN AUNIUNIUNIR LL79th IETF - Beijing IETF - BeijingVLAN Based E-Tree Solution in VPLSRLBridgeModuleVSIFwderRoot PWCE1ACPWLeafBridgePE1PE2RootLeafLBridge 2 VLANs into a VSIPE3CE2CE3CE4CE5Tagged PW with 2 VLANsNSPVSIFwderVSIF
5、wderVPLSMENL79th IETF - Beijing IETF - BeijingVLAN Mapping OptionsRLBridgeModuleVSIFwderRoot PWCE1ACPWLeafBridgePE1PE2RootLeafLCE2CE3CE4VSIFwderVLAN mappingoptionsVLAN mappingoptionsVPLSMENPE3CE5NSPVSIFwder L79th IETF - Beijing IETF - BeijingE-Tree Processing PW works in Tagged mode PE may be provid
6、ed with VLAN mapping capability Remote Root VLAN Local Root VLAN Remote Leaf VLAN Local Leaf VLAN At the ingress PE, Ethernet frames with Root or Leaf VLAN encapsulated in the same PW and transparently label switched At the egress PE, Ethernet frames translated into Local Root or Leaf VLAN Leaf VLAN
7、 traffic filtered either at Leaf UNI on egress PE, or on ingress PE when its egress PE is a pure leaf PE79th IETF - Beijing IETF - BeijingExtension of LDP Protocol A new E-Tree sub-TLV is defined for PW interface parameters TLV PEs negotiate the support of E-Tree when a PW is set up Root VLAN ID and
8、 Leaf VLAN ID carried in the sub-TLV Several bits to help the negotiation procedure79th IETF - Beijing IETF - BeijingNext Step The authors would like to request more WG feedbacks on mailing list To be accepted as WG draft?79th IETF - Beijing IETF - BeijingBackup Slides79th IETF - Beijing IETF - Beij
9、ingE-Tree Solutions in IEEE (multi-domain) Trunk SVLAN and Branch SVLAN are also used to provide E-Tree service across multiple domains where roots and leaves located diverselyRoot UNI Root UNILeaf UNILeaf UNI Leaf UNI Leaf UNINNIMEN A MEN CMEN BNNITrunkBranch79th IETF - Beijing IETF - BeijingAsymme
10、tric VLAN Mapping in IEEE Ingress and egress frames at Root and Leaf UNI are tagged with a single C-VLAN In the network between Roots and Leaves, frames are tagged with Trunk or Branch S-VLANIngress Translation Egress TranslationAt RootAt LeafC-VLAN =Trunk S-VLANC-VLAN=Branch S-VLANTrunk S-VLAN =C-VLANBranch S-VLAN=C-VLANTrunk S-VLAN =C-VLANBranch S-VLAN Discarded79th IETF - Beijing IETF - BeijingThank You79th IETF - Beijing IETF - Beijing
