MPLS Label Allocation for BGP MAC-VPN
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Solution Overview
Problem
Current MPLS networks lack an operable mechanism for label allocation in the context of BGP MAC-VPN, leading to issues such as packet duplication, loop prevention, and MAC table instability.
Innovation Solution
A method for distributing flooding labels within an MPLS infrastructure supporting BGP MAC-VPN, involving the generation of generic flooding labels and multi-homing flooding labels using MAC-VPN Network Layer Reachability Information, which includes a Route-Distinguisher and Ethernet Segment Identifier, to prevent packet duplication and loop prevention, and stabilize MAC tables.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Adaptability or versatility
If BGP MAC-VPN is implemented within MPLS infrastructure, then BGP-based distribution of MAC addresses in VPLS is enabled, but there is no operable mechanism for label allocation
Solution Approach 1:
The label allocation mechanism is segmented into two distinct types: Generic Flooding Labels (GFL) for general flooding traffic, and Multi-Homing Flooding Labels (MHFL) for specific multi-homing scenarios. This segmentation allows each label type to be handled through dedicated allocation procedures, resolving the complexity of managing a unified label allocation system for BGP MAC-VPN.
Solution Approach 2:
The patent introduces intermediary label structures that mediate between the BGP control plane and the MPLS data plane. These intermediary labels enable the translation and coordination between BGP MAC address distribution and MPLS label switching, providing the necessary mechanism for label allocation in the BGP MAC-VPN context.
2Reliability
If flooding labels are distributed using MAC-VPN NLRI with RD and ESI, then packet duplication is prevented and loops are avoided, but the system complexity increases
Solution Approach 1:
The patent applies local quality by assigning specific label types to specific functional requirements: GFL for general flooding scenarios and MHFL for multi-homing scenarios. Each label type carries localized attributes (such as ESI for multi-homing) that are relevant only to its specific use case, enabling reliable packet duplication prevention without requiring all packets to carry all possible attributes.
Solution Approach 2:
Instead of having source PE routers allocate labels unilaterally, the patent inverts the approach by having destination PE routers allocate and advertise flooding labels back toward source PE routers. This inversion enables more intelligent label allocation where the destination (which knows the actual flooding requirements) controls the label assignment, thereby preventing packet duplication and loops more effectively.
3Adaptability or versatility
If multiple LSPs are provisioned in MPLS network, then differentiated end-to-end services are enabled, but network conditions change require frequent LSP changes
Solution Approach 1:
The patent implements dynamics by enabling flexible label allocation where destination PE routers can dynamically assign GFL or MHFL based on current network conditions and flooding requirements. This dynamic label allocation allows LSPs to be adapted to changing network conditions without requiring complete re-provisioning, maintaining service differentiation while improving LSP stability.
Data Source
AI summary
The invention includes a method and apparatus for distributing flooding labels within a Multiprotocol Label Switching (MPLS) infrastructure supporting Border Gateway Protocol (BGP) Media Access Control (MAC) Virtual Private Networking (VPN).