Some books describe the topology table as a compilation of routing tables from all the neighboring routers.
Gareth did a good job trying to explain the feasible distance vs. advertised distance thing...there's also a good explanation of this in Ch 1 of the EGIRP Network Design Solutions (Cisco Press) - you may need to re-read it a few times though. Another thing to remember is that the receiving router adds its interface metric to the distance reported by the neighboring router. A router's feasibility distance is its minimum distance to a destination - put another way, the best path to a destination network. A neighbor router meets the feasibility condition if it reports a lower distance than the feasibility distance. As Gareth said, this ensures that the neighbor isn't using a path back through the querying router If a router meets the feasibility condition it is a feasible successor. Clear as mud yet? -----Original Message----- From: [EMAIL PROTECTED] [mailto:[EMAIL PROTECTED]]On Behalf Of Hunt Lee Sent: Friday, November 02, 2001 4:03 PM To: [EMAIL PROTECTED] Subject: EIGRP [7:25125] 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)? 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? Thanks in advance. Best Regards, Hunt Message Posted at: http://www.groupstudy.com/form/read.php?f=7&i=25191&t=25125 -------------------------------------------------- FAQ, list archives, and subscription info: http://www.groupstudy.com/list/cisco.html Report misconduct and Nondisclosure violations to [EMAIL PROTECTED]
