@misc{rfc9658, series = {Request for Comments}, number = 9658, howpublished = {RFC 9658}, publisher = {RFC Editor}, doi = {10.17487/RFC9658}, url = {https://www.rfc-editor.org/info/rfc9658}, author = {IJsbrand Wijnands and Mankamana Prasad Mishra and Syed Kamran Raza and Zhaohui (Jeffrey) Zhang and Arkadiy Gulko}, title = {{Multipoint LDP Extensions for Multi-Topology Routing}}, pagetotal = 14, year = 2024, month = oct, abstract = {Multi-Topology Routing (MTR) is a technology that enables service differentiation within an IP network. The Flexible Algorithm (FA) is another mechanism for creating a sub-topology within a topology using defined topology constraints and computation algorithms. In order to deploy Multipoint LDP (mLDP) in a network that supports MTR, FA, or other methods of signaling non-default IGP Algorithms (IPAs), mLDP is required to become topology and algorithm aware. This document specifies extensions to mLDP to support the use of MTR/IPAs such that, when building multipoint Label Switched Paths (LSPs), the LSPs can follow a particular topology and algorithm. This document updates RFC 7307 by allocating eight bits from a previously reserved field to be used as the "IPA" field.}, }