Understanding Forwarding Ambiguity in Adjacent ISP Domains: SPG Demonstrations

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This document explores the concept of forwarding ambiguity in adjacent ISP domains, highlighting the use of Segment Protection Groups (SPGs) to address these challenges. Three SPGs are presented: SPG1 (Primary-IS 3-4 in violet, Backup-IS 3-5-4 in pink), SPG2 (Primary-IS 4-5 in green, Backup-IS 4-6-5 in gray), and SPG3 (Primary-IS 6-4-5 in brown, Backup-IS 6-5 in yellow). The discussion emphasizes how SPG3 effectively solves forwarding ambiguity issues when the violet segment fails, ensuring seamless connectivity.

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May 11, 2026

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Understanding Forwarding Ambiguity in Adjacent ISP Domains: SPG Demonstrations

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Forwarding Ambiguity M Vinod Kumar Dr. Abhay Karandikar
Example of Adjacent ISP Domain- 1 1 3 4 5 2 6 7
Example of Adjacent ISP Domain- 2 1 3 4 5 2 6
Example of Adjacent ISP Domain- 3 1 SPG3 3 4 5 2 SPG2 6 SPG1 There are three Segment Protection Groups (SPGs): SPG1: Primary-IS 3-4 (violet color) and backup-IS 3-5-4 (pink color) SPG2: Primary-IS 4-5 (green color) and backup-IS 4-6-5 (gray color) SPG3: Primary-IS 6-4-5 (brown color) and backup-IS 6-5 (yellow color) SPG3 solves forwarding ambiguity problem when violet segment fails
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