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Integrated IS-IS Commands for CCNP BSCI

Sample Chapter is provided courtesy of Cisco Press.
Date: Dec 7, 2007.

Chapter Information

Chapter Description

This chapter provides information and commands concerning a wide range of Intermediate System-to-Intermediate System (IS-IS) topics related to the CCNP BSCI exam.

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CCNP BSCI Portable Command Guide

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Neighbors and Timers

`Router(config)#``interface fastethernet 0/0`	Enters interface configuration mode.
`Router(config-if)#``isis hello-interval 20`	Changes the interval to 20 seconds between exchanges of Hello protocol data units (PDU). The default is 10 seconds.
	NOTE A faster hello interval facilitates faster convergence but increases bandwidth and CPU use. It might also add to instability in the network. A slower hello interval saves bandwidth and CPU use.
`Router(config-if)#``isis hello-multiplier 4`	Changes the length of the hold-time multiplier. By default, an IS-IS router waits 3 times the hello interval until it considers a neighbor dead.
	TIP The isis hello-interval and the isis hello-multiplier commands are changed on a per-interface basis. Timers can vary on different interfaces.
	NOTE It makes more sense to tune the hello interval and hello multiplier on point-to-point interfaces than on LAN interfaces.
	NOTE Hello intervals and hold times do not have to match between IS-IS neighbors for an adjacency to form.

6. Election of the Designated IS (DIS) | Next Section Previous Section

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