don't know the book you have ( but guessing Doyle? ) one of the two neighbor statements is wrong. your neighbor is the guy on the other end of the link. Just another one of those errors that seem to flood all the study materials.
Whichever one makes sense is probably the right answer. BTW, what the distribute list / access list is attempting to accomplish is to prevent the 172.16.5.0/24 route from being advertised, while at the same time permitting all other routes to be advertised. Is that what the author is attempting to demonstrate? HTH Chuck -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Aaron Shively Sent: Thursday, October 25, 2001 4:14 PM To: [EMAIL PROTECTED] Subject: BGP Neighbor distribute-list question? [7:24177] I need some clarification on the the neighbor distribute-list command used for filtering BGP updates. The book I am reading gives the following example, and it is either a typo or I am just misunderstanding it. You have the following route filter configuration: Router bgp 100 Network 172.16.0.0 mask 255.255.0.0 Neighbor 172.16.3.1 remote-as 100 Neighbor 172.16.1.1 remote-as 100 distribute-list 1 out Access-list 1 deny 172.16.5.0 0.0.0.255 Access-list 1 permit 0.0.0.0 255.255.255.255 There is a diagram and 172.16.1.1/24 is on Neighbor 2 and 172.16.3.1/24 is on Neighbor 1 It then says that the above configuration does the following: The use of the distribute-list command and access-list 1 prevents the BGP routing updates from neighbor 1 propagating into neighbor 2's routing table. Also, in the diagram Neighbor 1 (172.16.3.1/24) is connected to 172.16.5.0/24 so to me is seems like there is a typo in the book and instead of having the config line read: Neighbor 172.16.1.1 remote-as 100 distribute-list 1 out I think it should read: Neighbor 172.16.3.1 remote-as 100 distribute-list 1 out This would then make the above statment correct in saying that it prevents the BGP routing updates from neighbor 1 propagating into neighbor 2's routing table. Please let me know if what I am saying sounds correct based on the above information and that it is in fact a typo, or if maybe I am just not understanding it correctly. Thanks, -Aaron Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=24182&t=24177 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
