12/21/2023 0 Comments Algo meaningExclude Admin Group: A link is excluded from path calculation if any bit in the link's administrative group has the same name as an affinity bit referenced by the administrative group.Exclude, Include-Any, and Include-All are used to describe link constraints. 0: IGP metric, that is, the link cost in a traditional IGP.Dijkstra's SPF algorithm is used, but the local policy is not allowed to change the paths calculated by SPF to different ones. Dijkstra's SPF algorithm is used and the local policy is allowed to change the paths calculated by SPF to different ones. The definition of Flex-Algo ( k) contains three elements: Flex-Algo ( k) has local significance only in the logical topology that participates in this algorithm. You can customize 128 Flex-Algos specifically, you can customize Flex-Algo (128) to Flex-Algo (255).Įach Flex-Algo can be represented by Flex-Algo ( k). Furthermore, the load balancing and backup paths meet the constraints of a Flex-Algo. This means that a Flex-Algo can be natively used on SR networks and is compatible with ECMP load balancing and TI-LFA backup paths in these networks. Since the birth of SR, a Flex-Algo is an inherent component of the SR technical architecture.As such, a Flex-Algo can meet the requirements of different services, including high-bandwidth and low-delay services. In addition to the link cost value, you can use the SPF algorithm to calculate the shortest path to the destination address based on the link delay and TE metric values. The types of metrics used in the IGP path algorithm can be defined.As such, the network may be divided into multiple independent computing units and network slices as required. Constraints of the IGP path algorithm can be defined to further exclude some links in the logical topology. NEs involved in the same Flex-Algo natively form an independent logical topology.A Flex-Algo allows an IGP (IS-IS or OSPF) to calculate constraint-based network paths, implementing TE capabilities in an easier and more flexible manner.įlex-Algo technology was proposed in draft-ietf-lsr-flex-algo and is mainly used on SR ( SR-MPLS and SRv6) networks. To address these issues, Flexible Algorithm (Flex-Algo) technology is introduced. In addition, devices need to maintain a large amount of status information. However, TE technologies, such as MPLS TE, are complex to configure and have poor scalability. Based on certain constraints, TE enables network traffic to be transmitted along specified paths. This prevents network resources from being flexibly used.Ĭarriers have been exploring traffic engineering (TE) technologies for many years. When all packets select the shortest path with the lowest cost, the traffic paths of all services are fixed. Carriers want to define Interior Gateway Protocol (IGP) path calculation rules based on their requirements for example, they want to forward traffic along the path with the minimum delay or exclude some links for forwarding on networks.Ī traditional IGP can only use the Shortest Path First (SPF) algorithm to calculate the shortest path to a destination address on the entire network topology based on the link cost. With the advent of the 5G era, various service applications with differentiated features will coexist, posing new requirements on network flexibility.
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