Hi Sue, Thanks for your question.
draft-ietf-spring-for-enhanced-vpn-10 proposes an approach to use resource-aware SIDs to build SR based NRPs, each resource aware SIDs indicates both the network instruction, and the subset of resources allocated to an NRP for executing the instruction. The resource-aware SIDs may be allocated via configuration or by the network nodes themselves, then the resource-aware SIDs and their associated attributes can be distributed in control plane. BGP-LS is used to distribute the resource-aware SIDs and their attributes to the network controller. One approach is as described in draft-ietf-idr-bgpls-sr-vtn-mt. The controller can use BGP to advertise the SR Policy candidate paths which are composed of resource-aware SIDs of an specific NRP. With the resource-aware SID based approach, the NRP-ID is not required in BGP extensions. The NRP-ID extension is needed when an data plane NRP Selector ID is carried in packets for indicating the corresponding NRP. Hope this helps to answer your question. Best regards, Jie From: Susan Hares <[email protected]> Sent: Monday, January 5, 2026 6:18 AM To: SPRING WG List <[email protected]>; Jie Dong <[email protected]> Subject: [spring] draft-ietf-spring-sr-for-enhanced-vpn-10 - a questino I have a question about draft-ietf-spring-for-enhanced-vpn-10.txt Section 3 states in paragraph 4: / "As the resource-aware SIDs can be allocated either by a centralized network controller or by the network nodes, control plane protocols such as IGP (e.g., IS-IS or OSPF) and BGP-LS can be used to distribute the resource-aware SIDs, together with the associated network resource and topology attributes of an NRP to other nodes in the same NRP and also to the controller, so that both the network nodes and the controller can generate the NRP-specific forwarding table or forwarding entries based on the resource-aware SIDs of the NRP. "/ BGP-LS distributes existing values for the resource-aware SIDs. Is the controller work only based on reading existing values (set by configuration or the OSPF or ISIS protocols? However, NRP ID for candidate SR Policy (BGP-SR) is passed by BGP? How does this fit into this paragraph?
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