Segment Routing Bitmap Signaling for EVPN VPWS Overhead Reduction
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Solution Overview
Problem
Conventional EVPN VPWS implementations suffer from significant BGP overhead and lack Active/Active multihoming capabilities, which restricts redundancy and convergence in network services.
Innovation Solution
The use of Segment Routing for VPWS signaling, employing a SID label stack that includes a destination node SID, a P2P service SID, and an optional Flexible Cross Connect (FXC) normalized Virtual Local Area Network Identifier, reduces BGP overhead and enables Active/Active multihoming and multipathing by leveraging Segment Routing anycast SIDs for redundancy and fast convergence.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Quantity of substance
If conventional EVPN VPWS signaling is used, then service provisioning is achieved, but BGP overhead becomes significant
Solution Approach 1:
The patent combines multiple service identifiers into a single bitmap field within the SR policy advertisement. Instead of using separate BGP routes for each VPWS service, multiple services are encoded in a compact bitmap representation, merging what would otherwise be numerous separate signaling messages into one efficient advertisement.
Solution Approach 2:
The patent changes the representation parameter of service identifiers from individual route entries to a compressed bitmap format. Each bit in the bitmap corresponds to a specific service identifier, allowing efficient encoding of multiple services. This parameter transformation dramatically reduces the size of signaling data while preserving complete service information.
2Reliability
If conventional EVPN VPWS is implemented, then point-to-point services are supported, but Active/Active multihoming capabilities are lost
Solution Approach 1:
The patent implements a universal SR policy framework that simultaneously supports both point-to-point services and Active/Active multihoming scenarios. The same bitmap-based signaling mechanism and SR policy structure handle diverse service types and redundancy requirements, eliminating the need for separate mechanisms for different service modes.
Solution Approach 2:
The patent introduces dynamic service identifier allocation within the bitmap structure, allowing service identifiers to be flexibly assigned and reassigned based on current network requirements. This dynamic approach enables the system to adapt between different multihoming configurations and service types without structural changes to the signaling framework.
3Productivity
If BGP overhead is reduced through compression, then signaling efficiency improves, but service identification complexity increases
Solution Approach 1:
The patent implements self-service through automatic bitmap generation and interpretation at the network edges. The bitmap structure is designed to be self-describing, where the position and value of each bit automatically encode service identification information. This eliminates the need for complex manual service identification processes while maintaining signaling efficiency.
Data Source
AI summary
Systems and methods associated with a node in a Segment Routing network include, responsive to what services are support at a node in a Segment Routing network, creating a bitmap to represent the plurality of services supported at the node; and transmitting an advertisement with the bitmap such that the advertisement is a single advertisement of multiple services. This approach can reduce the advertisement of rout updates by orders of magnitude.