Understood. Thank you for correcting me. As I said, I too am diving into this!
""nrf"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > ""Robert D. Cluett"" wrote in message > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > I am just getting into BGP and I understand it like this. An update can > > carry all or some of the attributes with it which define the route to the > > destination. There is a pecking order of what attributes determine what > > route will be utilized. So if you were to look inside of a BGP update > > packet you will see the mandatory attributes being AS-PATH, Next-Hop and > > Orign (these are mandatory so they will alway be in the packet). The > > discretionary and optional attributes may or may not be there. When > > updating the BGP table these attributes are analyzed and then the route is > > chosen to the destination. Remember that a router will send an update > > packet to you. It is adding the AS that is passes through to the AS_PATH > > field. This is one of the requirements in order to have a route to a > > destination. Next_Hop (IP Address) is also a requirement so you know > where > > to go next. Origin defines what AS this update came from. > > Actually, this in incorrect. The Origin attribute has nothing to do with > what AS the route comes from. It has to do with how the route in question > was passed into BGP. > > The best reference for path-attributes is still, the one and only, RFC1771. > Anybody who really really wants to understand BGP must read this. > > > I re-read the > > chapter 3 times and have it cold now! I typically re-read and it clears > > everything up that I missed. > > > > ""maine dude"" wrote in message > > [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > > > Hi I'm having problems on understanding how attributes work. I > understand > > > what they are there for but when questions come up I am unable to relate > > the > > > question to what I understand when I read the book. Are there any > simpler > > > guides available. I have the same problem with prefix-lists. -DJ > > > > > > > > > > > > --------------------------------- > > > Get a bigger mailbox -- choose a size that fits your needs. > > > > > > http://uk.docs.yahoo.com/mail_storage.html Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=50334&t=50248 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
