IS-IS (Intermediate System to Intermediate System) protocolhas a limit on the size ofLink-State PDUs (LSPs).
Why Fragmentation?
LSPs contain routing and topology information.
If the LSPexceeds the maximum size, fragmentationallows the device to store and forward more routesby breaking them into smaller LSPs.
Key Point:IS-ISfragmentation is essentialin large-scale networks where routing tables grow beyond the default LSP size limit.
✅Reference:Huawei HCIE-Datacom Guide - IS-IS Protocol and Route Scaling
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