Which of the following is the purpose of configuring IS-IS fragmentation on an IS-IS device?
Disable the device from establishing IS-IS neighbor relationships.
Enable the device to support more IS-IS routes.
There is no practical purpose.
Disable the device from learning IS-IS link-state information.
IS-IS (Intermediate System to Intermediate System) protocol has a limit on the size of Link-State PDUs (LSPs).
Why Fragmentation?
LSPs contain routing and topology information.
If the LSP exceeds the maximum size, fragmentation allows the device to store and forward more routes by breaking them into smaller LSPs.
Key Point: IS-IS fragmentation is essential in 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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