Hunt Lee wrote: > I understand that EBGP connection has to be directly connected, > so in this > case, this example is absolutely correct. But I also read on > the book which > states BGP speaker will not advertise any routes unless IGP (or > static > route) can reach BGP's next hop. So in this example, how come > there is no > IGP or static running? Or are they not necessary if there isn't > any third or > fourth router attached to router A or B? >
BGP will NOT ADVERTISE a route (if synchronization is not turned off) if it does not know about it via IGP (do a show ip route to see it) or if the next-hop is unreachable. The above example will work because BGP INDEED KNOWS about the status of next hop via "DIRECTLY CONNECTED" status. Also, if there is another router C which belongs to the same AS as A & there is a router D belonging to different AS (than A or B), in that case C will not advertise routes learned from B unless it has learned of its existence via an IGP (of course the next hop should be reachable, and hence the need for an IGP). hth Nick Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=29948&t=29942 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
