Fragmentation or packet drops can occur for data packets at any node in the path of packets based on the maximum transmission unit (MTU) of the links that constitute the path. This path can be a tunneled path, which is formed over multiple nodes based on the constraints advertised by Interior Gateway Protocol (IGP) of those nodes. There are certain flows over a tunneled path where fragmentation and dropped packets can cause multiple issues. Provided herein is a proposal to extend the IGP extended link Type-Length-Value (TLV) object to carry information identifying the MTU of a link, which can be used via various applications, such as Traffic Engineering (TE) applications, as a network constraint for path computation. Additionally, techniques herein propose a variant of Constrained Shortest Path First (CSFP) to include link MTU as a constraint for computing candidate route paths for a given destination.

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This work is licensed under a Creative Commons Attribution 4.0 License.