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In modern networks, especially those handling real-time data, network performance metrics like bandwidth and latency are as crucial for data-path selection as traditional routing metrics. Incorporating this performance data into path selection offers an advantageous, scalable, and cost-effective method for network optimization.

Link State IGPs such as IS-IS depend upon having a consistent LSDB across all the Intermediate Systems (ISs or nodes) in the network in order to provide correct forwarding of data packets. When topology change occurs due to various network events, new/updated LSPs are propagated network-wide. The speed of propagation is key for a faster network convergence.

Until EOS release 4.32.0F, EOS allows users to statically configure link min-delay and max-delay used for IS-IS FlexAlgo. This feature adds support for dynamic measurement of link delay using the TWAMP Light protocol described in RFC 8186 and provides it to IS-IS FlexAlgo dynamically.

This document describes how to configure and monitor this feature.