Comments in-line: ""Hunt Lee"" wrote in message [EMAIL PROTECTED]">news:[EMAIL PROTECTED]... > Can anyone please help me on this? > > For EIGRP, I understand that for routing table, EIGRP has kept a separate > routing table for each protocol: so it has one for IP EIGRP, another one > for IPX EIGRP, and another one for AppleTalk EIGRP. But what's a topology > table (show ip eigrp topology)?
I always think of it as the Router's notebook. All the possible routes are scribbled in to the topology table so that it can calculate the routes which will actually go in to the routing table. ie the one(s) with the lowest distance (or which fit within the range if variance is used). > > Also, I have read the BSCN book (by Cisco Press) many many times... I > understand that the successor is the EIGRP main route, while the feasible > successor is the backup route. but the book states that to qualify as a > feasible successor, the next-hop router must have an advertised distance > less than the feasible distance of the current successor - also, what's the > difference between the advertised distance and the feasible distance? Tricky to visualise the reason for this one. I'll have a go at explaining. The advertised distance is the distance from the next hop router to the destination, whereas the feasible distance is the distance from this router (ie including the distance from this router to the next hop). So...If the advertised distance is greater than the feasible distance of the current successor (not allowed), the chances are that this route that is being advertised is actually back through you and via the current successor. I've got to admit I'm rusty - been pushing too many pens lately, so more than happy for someone to step in and correct if necessary. > > Thanks in advance. > > Best Regards, > Hunt Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=25149&t=25125 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
