Thank you for the explanation, that helps a lot. -----Original Message----- From: JffryH(Yahoo) [mailto:[EMAIL PROTECTED]] Sent: Monday, October 22, 2001 11:35 PM To: [EMAIL PROTECTED] Subject: RE: Route Reflectors and Peer Groups [7:23725]
1. You don't need to worry about this issue after IOS 12.0. Some version of 11.3 also support that and Also have no such problem. Just discard all the restriction and you will be OK. http://www.cisco.com/warp/public/459/29.html 2. The restriction is now a history. If you want to know: it is because that BGP implement poison reverse mechanism to prevent route feedback. That it, when a router learn route from neighbor A, it will send withdraw to neighbor A. This ensure A will not learn route back from our router. But when configured with beer-group, all outbound updates are built once. So our router will also withdraw the route from other neighbor in the same peer-group, like neighbor B. If so, B will have no route because it was withdrawn. Newer version of IOS is clever enough to detect that and keep them from happening. CCIE Study Professional Checklist http://www.geocities.com/berdde/ -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Lupi, Guy Sent: Monday, October 22, 2001 8:43 AM To: [EMAIL PROTECTED] Subject: Route Reflectors and Peer Groups [7:23725] Below is an excerpt from a Cisco case study on multiple route reflectors withing a cluster: An important thing to note, is that peer-groups were not used in the above configuration. If the clients inside a cluster do not have direct IBGP peers among one another and they exchange updates through the RR, peer-goups should not be used. If peer groups were to be configured, then a potential withdrawal to the source of a route on the RR would be sent to all clients inside the cluster and could cause problems. The router sub-command bgp client-to-client reflection is enabled by default on the RR. If BGP client-to-client reflection were turned off on the RR and redundant BGP peering was made between the clients, then using peer groups would be alright. Does anyone know what they mean? I know in IOS versions 12.0 and lower there were issues with route reflection using peer groups, but I am trying to figure out what they are trying to say here. What do they mean by a potential withdrawal to the source of a route on the RR? Any help would be appreciated. Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=23874&t=23725 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
