Seamless MPLS for Mobile Backhaul
draft-li-mpls-mbb-seamless-mpls-00
Zhenbin Li, Lei Li (Huawei)
Manuel Julián López Morillo (Vodafone)
Tianle Yang (China Mobile)
IETF 87, Berlin, Germany
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Seamless MPLS Network Architecture
Access
Aggregation
Core
IS-IS L2 RR
LDP
IS-IS L1
LDP
Static Route
LDP DoD
AGN
Aggregation
LSr
ABR
IBGP
LSR
IBGP
IS-IS L1
LDP
ABR
IBGP
LSR
Access
Static Route
LDP DoD
AGN
IBGP
AN
AN
AGN
LSR
ABR
ISIS
ABR Loop-Back
LSR
ABR
LSR
AGN
ISIS
ABR Loop-Back
The key concepts for Seamless MPLS: Decoupling the transport layer and service layer.
The network will be divided into multiple IGP areas for access, aggregation and core
network
IBGP run among the Area Boarder Routers (ABRs) to advertise labeled route.
LDP DoD is introduced to set up LSP on demand between AN and AGN.
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Seamless MPLS for Mobile Backhaul Networks
Ring topology is adopted in mobile backhaul networks.
Variable devices with variable capability are deployed in the access
ring and aggregation ring.
Last Mile
Access
Aggregation
Core
CSG
BSC
CSG
RSG
ASG
BTS
CSG
S-GW/MME
NodeB
CSG
CSG
ASG
RSG
eNB
RNC
Service
Layer
L2/L3
Services
Hierarchical BGP LSP
Transport
Layer
IETF 87 MPLS
Next-Hop self
Next-Hop self
BGP LSP
LDP/TE LSP
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Scenarios for Network Architecture
Network Architecture 1: Network separated by Ases
 Scenario 1: ASes connected by different ASBRs
 Scenario 2: ASes connected by integrated ASBRs
 Different network integrated in one AS but separated by
different IGP areas
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Scenarios for Different Edge of Labeled BGP
Scenario 1: Cell Site/User PE devices as the edge
Scenario 2: ASG nodes as the edge
 Scenario 3: RSG(ASBR) devices as the edge
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Overall New Requirements of Seamless MPLS for MBB
Requirements on MPLS TE
 Proxy Egress LSP and BGP LSP Stitching
 Unified OAM: end-to-end OAM for mobile service
 Protection: end-to-end convergence in 50 ms
 Scalability: improve scalability of MPLS TE
 Requirements on Ring Network
 LDP DoD: Multiple hops for provision of LDP DoD
 LDP FRR: 100% network coverage
 Requirements on L3VPN
 Policy control: Reduce complexity on control route distribution
 L3VPN OAM: SDH-like OAM requirement for mobile service
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Requirements and Solutions of Seamless MPLS for MBB(1)
 Scalability
 Auto Mesh and Enhancement:
―Auto Mesh: [RFC4972]
―Role-based Auto Mesh: [I-D.li-ccamp-role-based-automesh]
 Service-Driven Tunnel:
―[I-D.li-mpls-serv-driven-co-lsp-fmwk]
 Auto Path Computation
―[I-D.li-ospf-auto-mbb-te-path]
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Requirements and Solutions of Seamless MPLS for MBB(2)
 Access Stitching
 Transport Layer Stitching
―Proxy TE: [I-D.li-mpls-proxy-te-lsp]
―Proxy LDP DoD: proposed later
 Service Layer Stitching
―L3 Service Stitching: Hierarchy of VPN (HoVPN)
―L2VPN Service stitching: Multi-Segment PW
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Requirements and Solutions of Seamless MPLS for MBB(3)
Reliability
 MPLS TE
 MPLS LDP
―MRT FRR based on LDP MT: [I-D.li-rtgwg-ldp-mt-mrt-frr]
Policy Control: Improve Intelligence of IBGP
 AIGP
―[I-D.ietf-idr-aigp]
 NEXTHOP_PATH ATTIBUTE
―[I-D.zhang-idr-nexthop-path-attr-00]
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Requirements and Solutions of Seamless MPLS for MBB(4)
 OAM
 L2VPN
―VPN Layer: MPLS TP for PW
―Service Layer: Y.1731 for MAC
 L3VPN
―VPN Layer - L3VPN PM: [I-D.zheng-l3vpn-pm-analysis]/ [I-D.dongl3vpn-pm-framework]
―VPN Layer - IPFPM: [I-D.chen-coloring-based-ipfpm-framework]
 Service Path Visualization
―Trace the whole path in one operation
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Next Steps
• Solicit more comments and feedback
• Incorporate more requirements and solutions
• Revise the draft
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