The BGP paths are used differently than the equal-cost paths to the destination. Assume you have two T1's which run to Neighbor A, and one T1 which runs to Neighbor B. If Neighbor A's BGP route advertisement is preferred over Neighbor B's, then the router will distribute traffic over both equal-cost T1's to Neighbor A. There is only one BGP path, but there can be multiple physical links to that neighbor.
We do that with some of our T1's. -- Jeff Harris - Cisco/Unix Engineer CCNA, CCNP Routing, Remote Access Passed On Thu, May 23, 2002 at 05:22:20PM -0400, cebuano wrote: > Jeff, > I don't have a way of testing this right now. I'm still waiting for a few > crossover cables. But interestingly, i'm just reading Doyle's vol.2 > page 92 "When there are parallel paths to a particular destination, > Cisco's implementation of EBGP by default selects only one path." > So i must be misreading something here. I don't recall if this type > of scenario was in one of the BGP labs for BSCN. > I'll keep you posted of my own lab result. > Thanks. > Elmer > > ----- Original Message ----- > From: "jeff sicuranza" > To: > Sent: Wednesday, May 22, 2002 2:46 PM > Subject: Re: BGP load balancing [7:44697] > > > > Yes it does if you are doing EBGP and your router has two or more directly > > conneted links to your EBGP peer. The the default load balancing will work > > if static routes or an IGP is used for your subnets linking your > neighbors. > > You see it is not BGP performing the load balancing but the normal > behavior > > of load balancing across equal cost paths (if exists) regardless if you > are > > using static or IGP routes.. EBGP multihop also does this however, you are > > still using the behavior of the static and IGP routes for equal cost paths > > but do not need to have your neighbors directly connected... Lab it you > will > > see... Have fun.... Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=44899&t=44697 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
