SRv6 Segment Identifier Compression for Satelite Networks

This document defines a compression method for Segment Identifiers (SIDs) in Segment Routing over IPv6 (SRv6) specifically designed for satellite networks. By leveraging the topological location information of satellite nodes, a 128-bit SID is compressed into a 32-bit Compressed SID (C-SID). The method introduces a "SID Container" structure to support the co-existence of 128-bit SIDs and 32-bit C-SIDs within a single Segment List without modifying the SRv6 control plane or the fixed SRH header format defined in RFC 8754.