O'Reilly logo

Cisco IOS in a Nutshell, 2nd Edition by James Boney

Stay ahead with the world's most comprehensive technology and business learning platform.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, tutorials, and more.

Start Free Trial

No credit card required

Name

ospf auto-cost reference-bandwidth — router

Synopsis

ospf auto-cost reference-bandwidth value
no ospf auto-cost reference-bandwidth value

Configures

How OSPF calculates default metrics

Default

100 Mb

Description

The default OSPF metric is calculated by dividing the reference bandwidth by the bandwidth of the interface. The default value of the reference bandwidth is 10^8 or 100,000,000. Using this formula, the OSPF cost for a T1 is 65 (100,000,000/1,544,000). This number is also convenient because it causes the cost of an FDDI link or Fast Ethernet to be 1. This command allows you to modify the reference bandwidth to support interfaces that are faster than 100 Mbps.

With Safari, you learn the way you learn best. Get unlimited access to videos, live online training, learning paths, books, interactive tutorials, and more.

Start Free Trial

No credit card required