I have an EIGRP question that I'm a bit confused:
Firstly, let me try to see if I understand the terms: (for EIGRP)
Successor - A neighoring router used for packet forwarding that has a least
cost path to a destination.
Feasible Successor - Next-hop router for the backup path.
If this is the case, on TCP / IP Vol 1 (by Doyle) at p342 Fig 8.8
It shows the following EIGRP topology table:- (for Router Chanute)
Chanute# show ip eigrp topology
P 10.1.6.0 /24, 1 successors, FD is 768
via 10.1.2.1 (768 / 512), Ethernet0
First number (768) is the Feasible Dist of this local router (Chanute),
while the second number is the Advertised Dist from the neighbor router (at
10.1.2.1)
Since the first number equals the FD, this 10.1.2.1 is a successor for
subnet 10.1.6.0 /24. However, Jeff said "the route to 10.1.6.0 has an FD of
768 (which I agree so far), and Wright (at 10.1.2.1) is the only feasible
successor. ???
But isn't 10.1.2.1 the successor rather than the feasible successor?
As another example: (for another router called Langley)
Langley# show ip eigrp topology
P 10.1.2.0 /24, 1 successors, FD is 768
via 10.1.3.1 (768 / 256), Serial 0
via 10.1.5.2 (1280 / 256), Serial 1
In this case, since the route via 10.1.3.1 has FD have 768, it will be the
successor,
and the route via 10.1.5.2 has FD have 1280 (which is > 768) - so it is a
feasible successor
Am I on the right track?
Time to go home....
Thanks for any help in advance,
Best Regards,
Hunt Lee
System Engineer
WebCentral
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