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IS-IS Network Design Solutions by Scott Sturgess, Abe Martey

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Protocol Timers and Other IS-IS Database Parameters

IS-IS uses a suite of timers to control various events and to ensure routing stability without compromising the capability to converge fast enough in case of significant changes in the network. Various timers are used to ensure integrity of the Link-State database by enforcing periodic refresh of individual LSPs and aging out of stale information. This section discusses relevant timers for network operation purposes and provides insight into associated IOS commands that allow timer adjustments where possible.

Maxage

Maxage refers to the maximum life span of an LSP from the time it is generated by the source. ISO 10589 specifies maxage as a protocol constant with a value of 1200 seconds (20 minutes). ...

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