A router sends the components of the metric. The recipient calculates the actual composite metric by working a bunch of black magic.
The DUAL process and figuring out successors are separate from the metric calculation, but use the metric info. Here's a terrific paper on the topic: http://www.cisco.com/warp/public/103/eigrp-toc.html Priscilla At 09:36 AM 2/21/02, Steven A. Ridder wrote: >So is it safe for me to conclude that I was wrong in stating that EIGRP >sends the metrics to its neighbors. It actually sends the raw data such as >bandwidth, and delay, and the neighbor router uses the DUAL FSM process to >calculate the Reported Distance and then it's distance? I've been sniffing >and debugging all morning and I can't find a metric in a packet, just raw >data. > >-- >RFC 1149 Compliant. > >""Priscilla Oppenheimer"" wrote in message >[EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > The delay part of the EIGRP composite metric is not measured. It's based >on > > the type of interface. Each type of interface has a default value. You can > > change it, although this is risky and not recommended. > > > > Because EIGRP is a distance-vector protocol, the router sends route >updates > > that list networks. For each network, the router states the different >parts > > of the composite metric: > > > > 1) The delay to get to the network, which is a cumulation of all interface > > delays. > > > > 2) The bandwidth to that network, which is the minimum bandwidth for all > > interfaces. > > > > 3) Reliability which is not used by default, but you can configure the > > router to use it. If used, the reliability is measured and represents how > > much of the bandwidth to the network is in use. > > > > 4) Load which is not used by default, but you can configure the router to > > use it. If used, the load is measured and represents the fraction of > > packets that arrive at the network undamaged. > > > > The router also sends the following info, which is not part of the metric, > > but useful for other routers to know: > > > > 1) MTU is the maximum packet size that can be sent along the entire path > > without fragmentation. (That is, it is the minimum of the MTUs of all the > > networks involved in the path.) > > > > 2) The hop count is simply the number of routers that a packet will have >to > > go through to get to the destination. > > > > 3) Next hop is the address of the router to use to get to the destination, > > which is usually the router sending the update. > > > > Priscilla > > > > At 05:15 PM 2/20/02, Yatou Wu wrote: > > >Hi, > > > > > >In EIGRP, the delay metric is taken as configured in the interface of the > > >router by the administrator, by default, or by measurement? > > > > > >when the router calculates the metric, it needs to know the minimum > > >bandwidth along the path, and also the delay along the path. how can the > > >router pass the infor around? pass the total delay along the path, or >delay > > >of every link? > > > > > >thanks > > > > > >yatou > > > > > >_________________________________________________________________ > > >Get your FREE download of MSN Explorer at >http://explorer.msn.com/intl.asp. > > ________________________ > > > > Priscilla Oppenheimer > > http://www.priscilla.com ________________________ Priscilla Oppenheimer http://www.priscilla.com Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=36083&t=36001 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
