I looked at the example on Pg. 352, and the distance did change. I think the guy just wrote it weirdly. If you look at the remaining tables in ch 8, the new metric rose from 1280 to 5888.
-- RFC 1149 Compliant. Get in my head: http://sar.dynu.com ""Hamid Ali Asgari"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > But what if a route's metric changes, so that the minimum distance to > the destination increases beyond the FD. In this case will the FD be > updated or not? > > If the answer is yes, (as I assume it to be) why does Dyole say that > because the route didn't become active the FD didn't change.(Chapter > 8, before figure 8.15) > > Thanks, > Hamid > > --- "Steven A. Ridder" wrote: > > The FD is the lowest distance a router has to a specific network. > > A router > > may have more than one path to said network, but the lowest > > distance is FD > > and it is entered into the routing table. More than one route to > > said > > network can still exist and it will be entered in the EIGRP > > topology table > > as a back-up route. > > > > Without reading of the examples, I am guesing that a route's metric > > in the > > EIGRP topology table has changed. Even if it goes lower than it > > was > > previously, if it's not lower than the FD (the route in the routing > > table) > > than the FD to that netwtork doesn't change. If it is lower, than > > it will > > change the FD as it will become the new FD. > > > > -- > > > > RFC 1149 Compliant. > > Get in my head: > > http://sar.dynu.com > > > > > > ""Hamid Ali Asgari"" wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > Hi, > > > > > > Studying EIGRP, I got to a question: When is the Feasible > > Distance > > > (FD) for a destination updated. In Jeff Doyles Routing TCP/IP, > > > chapter 8, it says that as a result of a local computation the > > > following may occur: > > > > > > -If the feasible successor with the lowest distance is different > > from > > > the existing successor, the feasible successor will become the > > > successor. > > > -If the new distance is lower than the FD, the FD will be > > updated. > > > -If the new distance is different from the existing distance, > > updates > > > will be sent to all neighbors. > > > > > > So I asume that as a result of a local computation the FD may be > > > updated (reduced). > > > > > > Later in this chapter, before figure 8.15 it says: Because the > > > distance to 10.1.7.0 has increased and the route did not become > > > active, the FD is unchanged at Lilienthal. > > > > > > In EIGRP's White Paper on cisco's web site, after figure 3 it > > says: > > > When the link between Routers One and Three goes down, Router One > > > examines each path it knows to Network A and finds that it has a > > > feasible successor through Router Four. Router One uses this > > route, > > > using the metric through Router Four as the new feasible > > distance. > > > > > > In the book , Network Design and Case Studies by Cisco , Chapter > > 3 > > > Designing Large Scale Ip netwoks, Subtitle : Enhanced EIGRP > > > Convergence , It is mentioned that the > > > FD can only change during an active-to-passive transition . > > > > > > I am totally confused about the FD and what triggers an update > > for > > > it. I don't get it. Is a ROUTE ACTIVATION required for a FD > > update > > > necessarily? > > > > > > If the router receives a better advertisement , and if the FD is > > > lower , I feel FD can change during a local computation itself . > > > > > > Could any one explain? > > > > > > Thanks in advance, > > > > > > Hamid > > > > > > __________________________________________________ > > > Do You Yahoo!? > > > Yahoo! Greetings - send holiday greetings for Easter, Passover > > > http://greetings.yahoo.com/ > [EMAIL PROTECTED] > > > __________________________________________________ > Do You Yahoo!? > Yahoo! Greetings - send holiday greetings for Easter, Passover > http://greetings.yahoo.com/ Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=40000&t=40000 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
