A generally accepted tradeoff in networking is state vs optimality. Routing Interior Gateway Protocols (IGPs) like OSPF and IS-IS are segmented into areas, in part, to reduce the amount of routing information each router must manage, and to reduce the amount of routing information that is propagated when a topology change occurs. However, this segmentation comes at a cost, less information could mean less optimal end-to-end routing, a specific issue for source-routed paradigms, that are looking to create disjoint paths end to end/optimal routing. With the emergence of Segment Routing, this issue is getting more attention.
BGP-LS: What is it and is it still needed?
BGP-LS: What is it and is it still needed?
BGP-LS: What is it and is it still needed?
A generally accepted tradeoff in networking is state vs optimality. Routing Interior Gateway Protocols (IGPs) like OSPF and IS-IS are segmented into areas, in part, to reduce the amount of routing information each router must manage, and to reduce the amount of routing information that is propagated when a topology change occurs. However, this segmentation comes at a cost, less information could mean less optimal end-to-end routing, a specific issue for source-routed paradigms, that are looking to create disjoint paths end to end/optimal routing. With the emergence of Segment Routing, this issue is getting more attention.