you have two things going on, as far as the router is concerned. the routing process installs routes into the routing table based upon the specifications of the routing protocol involved.
also, you need to be careful when referring to "metric" in the routing table. Metric means different things to different routing protocols. RIP ( 1 and 2 ) metric = hop count RIP will load share across several routes if the metric is the same for all of them the RIP process will install multiple routes to the same destination into the routing table if the metric is the same for all of them. If there are several paths to the same destination, each with different metrics, then the RIP process installs only the route with the lowest metric ( hop count ) OSPF metric = cost OSPF will load share across several routes if the cost is the same for all of them. OSPF will only install multiple routes to the same destination if the cost is equal. If there are several routes of different cost, OSPF installs the route with the lowest cost. hence "shortest path" (E)IGRP metric = metric - those huge numbers we all know and love and which make no sense to us (E)IGRP will load share across several routes even if the metrics for those paths are different, if one uses the "variance" command the (E)IGRP processes will install multiple routes to the same destination into the routing table, even if the metrics for those routes are unequal. ""Hunt Lee"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Could someone help me get a clear understanding about this: > > I understand that when multiple routes exist in a routing table, the route > with the "longest match" will be chosen. Administrative Distance will only > breaks a tie between two routes of equal length. > > So, what is the "metric" for? When will a router uses "metric" to select a > route e.g. to select a route via Router A since it is metrically closer than > Router B to Router C. > > Thanks Everyone in advance. > > Best Regards, > Hunt Lee > System Engineer > WebCentral Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=38354&t=38353 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
