North American Network Operators Group Date Prev | Date Next | Date Index | Thread Index | Author Index | Historical Re: IGP metrics on WAN links
Since both isis and ospf support a large range of metrics nowadays, the actual mileage itself is an option for the metric too. For example, before isis wide metrics, a route with fiber mileage of 1000 might be given an isis metric of 16(using the method Sush mentioned to get the metric within the isis metric range of 0-63, so 1000/64 = 15.625, round up to 16), but now with wide metrics, the actual mileage can be used. Using the wide metrics also helps reduce/eliminate the equal cost paths that used to crop up in large networks with a limited metric range. and actual mileage of 1000On Fri, 19 Jul 2002, Sush Bhattarai wrote: > Date: Fri, 19 Jul 2002 14:25:16 -0400 > From: Sush Bhattarai <[email protected]> > To: [email protected], Tom Holbrook <[email protected]> > Subject: Re: IGP metrics on WAN links > > > Think most ISPs use actual fiber miles (with an arithmetic factor to get to > a certain range of course) as the means for the value of IGP metrics... of > course there are always some "twinking" done regularly to give higher > priorities to the higher bandwidth, link condition etc. > > Sush > > > ----- Original Message ----- > From: "Tom Holbrook" <[email protected]> > To: <[email protected]> > Sent: Friday, July 19, 2002 12:27 PM > Subject: IGP metrics on WAN links > > > > > > Just curious as to what people are using for metrics in their IGP and what > > their reasons are; bandwidth? geographical distance? latency? etc... > > > > Thanks > > -Tom > > > > __________________ > > Tom Holbrook > > Sr. Network Engineer > > Atlanta > > Earthlink > > > > -sean Spoon!
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