There is of course an exception to this rule :) BGP Backdoor makes an external route go to an admin distance of 200 so IGP routes take precedence without having to change the eBGP distance.
Case Study at: http://www.cisco.com/warp/customer/459/14.html#A14.0 Darren Ward (PGradCS, CCIE #8245, CCNP, CCDP, MCP) On Sun, 23 Jun 2002, Dain Deutschman wrote: > If the intent is to route the packets to the external AS, then the eBGP > route would be the most favorable because more likely than not...eBGP is the > routing protocol between autonomous systems. In other words/for example...if > there is more than 1 route to 10.0.0.0/16, which is a network in an external > AS, then the eBGP route should be the prefered route ( since it is an > external AS ). If the network were in the same AS, then an IGP route should > be used but...it wouldn't be in the same AS if it was learned via eBGP. Am I > making sense? Someone please jump in or correct me if I am wrong. > Thanks...Dain. > ""bergenpeak"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > Looking at the administrative distance values for the different > > routing mechanisms. > > > > Why would eBGP have a lower admin distance for a route than > > if learned via an IGP (like OSPF or ISIS)? Why wouldn't > > the default behavior be to prefer routes learned from the local > > IGP rather than via eBGP? > > > > THanks Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=47271&t=47147 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
