rfc9871v5.txt   rfc9871.txt 
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BGP-LU/BGP-IP (e.g., Appendix A.3.2) for brownfield scenarios. BGP-LU/BGP-IP (e.g., Appendix A.3.2) for brownfield scenarios.
Route resolution via a different color C2 can be automated by Route resolution via a different color C2 can be automated by
attaching BGP Color-EC C2 to CAR route (E2, C1), leveraging automated attaching BGP Color-EC C2 to CAR route (E2, C1), leveraging automated
steering as described in Section 8.4 of "Segment Routing Policy steering as described in Section 8.4 of "Segment Routing Policy
Architecture" [RFC9256] for BGP CAR routes. This mechanism is Architecture" [RFC9256] for BGP CAR routes. This mechanism is
illustrated in Appendix B.2. This mechanism SHOULD be supported. illustrated in Appendix B.2. This mechanism SHOULD be supported.
For CAR route resolution, if Color-EC color is present with the For CAR route resolution, if Color-EC color is present with the
route, it takes precedence over the route's intent color. The route, it takes precedence over the route's intent color. The
routes intent color is the LCM-EC color if present (see route's intent color is the LCM-EC color if present (see
Section 2.9.5), or else it is the NLRI color. Section 2.9.5), or else it is the NLRI color.
Local policy takes precedence over the color-based automated Local policy takes precedence over the color-based automated
resolution specified above. resolution specified above.
The color-aware route (N, C1) may be provided by BGP CAR itself in a The color-aware route (N, C1) may be provided by BGP CAR itself in a
hierarchical transport routing design. In such cases, based on the hierarchical transport routing design. In such cases, based on the
procedures described above, recursive resolution may occur over the procedures described above, recursive resolution may occur over the
same or different CAR route type. Section 7.1.2 describes a scenario same or different CAR route type. Section 7.1.2 describes a scenario
where CAR (E, C) route resolves over CAR IP Prefix route. where CAR (E, C) route resolves over CAR IP Prefix route.
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