Need help understanding eigrp topology table

Billy_Bob

To my understanding a route qualifies to be a feasible successor if its reported distance is less than then current successors feasible distance. However, there are a few times here where the FS has a RD greater than the successors FD. Am I missing something?


R1#sh ip ei to all-links
IP-EIGRP Topology Table for AS(1)/ID(1.1.1.1)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status

P 10.10.1.0/30, 1 successors, FD is 2681856, serno 47
via 10.0.1.1 (2681856/2169856), Serial0/0
P 10.10.2.0/30, 1 successors, FD is 2681856, serno 46
via 10.0.1.1 (2681856/2169856), Serial0/0
P 10.10.3.0/30, 1 successors, FD is 3193856, serno 49
via 10.0.1.1 (3193856/2681856), Serial0/0
via 10.0.2.2 (4217856/3705856), Serial0/1
P 10.3.1.0/24, 1 successors, FD is 2684416, serno 62
via 10.0.2.2 (2684416/2172416), Serial0/1
P 10.0.2.0/30, 1 successors, FD is 2169856, serno 2
via Connected, Serial0/1
P 10.2.1.0/24, 1 successors, FD is 2172416, serno 52
via 10.0.2.2 (2172416/28160), Serial0/1
P 10.0.3.0/30, 1 successors, FD is 2681856, serno 51
via 10.0.2.2 (2681856/2169856), Serial0/1
P 10.1.2.0/24, 1 successors, FD is 28160, serno 4
via Connected, FastEthernet0/0.3
P 10.2.2.0/24, 1 successors, FD is 2172416, serno 53
via 10.0.2.2 (2172416/28160), Serial0/1
P 10.1.1.0/24, 1 successors, FD is 28160, serno 3
via Connected, FastEthernet0/0.2
P 10.3.2.0/24, 1 successors, FD is 2684416, serno 56
via 10.0.2.2 (2684416/2172416), Serial0/1
via 10.0.1.1 (3708416/3196416), Serial0/0
P 10.0.1.0/30, 1 successors, FD is 2169856, serno 1
via Connected, Serial0/0
P 10.4.2.0/24, 2 successors, FD is 3196416, serno 61
via 10.0.1.1 (3196416/2684416), Serial0/0
via 10.0.2.2 (3196416/2684416), Serial0/1
P 10.0.4.0/30, 1 successors, FD is 3193856, serno 54
via 10.0.2.2 (3193856/2681856), Serial0/1
via 10.0.1.1 (3705856/3193856), Serial0/0
P 10.4.1.0/24, 2 successors, FD is 3196416, serno 63
via 10.0.1.1 (3196416/2684416), Serial0/0
via 10.0.2.2 (3196416/2684416), Serial0/1
P 10.0.5.0/30, 1 successors, FD is 3193856, serno 60
via 10.0.1.1 (3193856/2681856), Serial0/0
via 10.0.2.2 (3705856/3193856), Serial0/1
P 10.20.6.0/24, 1 successors, FD is 2707456, serno 50
via 10.0.1.1 (2707456/2195456), Serial0/0
P 10.20.7.0/24, 1 successors, FD is 2195456, serno 45
via 10.0.1.1 (2195456/281600), Serial0/0
P 10.20.5.0/24, 1 successors, FD is 2707456, serno 48
via 10.0.1.1 (2707456/2195456), Serial0/0

jason_lunde

you used the "all-links" subcommand. That will include links that are in the table but do not pass the feasibility condition. So you will see both your feasible successors...and what I call "the others". Its a real good command to use, and compare to the output of a show ip eigrp topology.

oxzgan

jason_lunde wrote: »

you used the "all-links" subcommand. That will include links that are in the table but do not pass the feasibility condition. So you will see both your feasible successors...and what I call "the others". Its a real good command to use, and compare to the output of a show ip eigrp topology.

yes excatly