The way I understand EIGRP to work out feasable sucessors is the following
:-
Feasible distance. This value is used in the feasibility condition check. If
the neighbor's reported distance (the metric after the slash) is less than
the feasible distance, the feasibility condition is met and that path is a
feasible successor. Once the software determines it has a feasible
successor, it does not have to send a query for that destination.
Please look at the last entry in the topology table below (pls note the FD
of 572672) :-
140.202.153.81 (Serial1/0), from 140.202.153.81, Send flag is 0x0
Composite metric is (3549696/3037696), Route is External
The only thing that is the same with the 3 sucessors are the last entry (I
suppose it's an FS) is the external metric of 2816.
router>sh ip eigrp top 154.202.0.0 255.255.192.0
IP-EIGRP topology entry for 154.202.0.0/18
State is Passive, Query origin flag is 1, 3 Successor(s), FD is 572672
Routing Descriptor Blocks:
140.202.125.10 (Hssi4/0/0), from 140.202.125.10, Send flag is 0x0
Composite metric is (572672/19200), Route is External
Vector metric:
Minimum bandwidth is 44247 Kbit
Total delay is 20110 microseconds
Reliability is 255/255
Load is 1/255
Minimum MTU is 1500
Hop count is 2
External data:
Originating router is 154.202.200.165
AS number of route is 202
External protocol is EIGRP, external metric is 19200
Administrator tag is 202 (0x000000D4)
140.202.47.109 (Fddi5/0), from 140.202.47.109, Send flag is 0x0
Composite metric is (572672/570112), Route is External
Vector metric:
Minimum bandwidth is 44247 Kbit
Total delay is 20110 microseconds
Reliability is 255/255
Load is 12/255
Minimum MTU is 1500
Hop count is 2
External data:
Originating router is 154.202.1.165
AS number of route is 202
External protocol is EIGRP, external metric is 2816
Administrator tag is 202 (0x000000D4)
140.202.143.223 (Fddi6/0), from 140.202.143.223, Send flag is 0x0
Composite metric is (572672/570112), Route is External
Vector metric:
Minimum bandwidth is 44247 Kbit
Total delay is 20110 microseconds
Reliability is 255/255
Load is 12/255
Minimum MTU is 1500
Hop count is 2
External data:
Originating router is 154.202.1.165
AS number of route is 202
External protocol is EIGRP, external metric is 2816
Administrator tag is 202 (0x000000D4)
140.202.153.81 (Serial1/0), from 140.202.153.81, Send flag is 0x0
Composite metric is (3549696/3037696), Route is External
Vector metric:
Minimum bandwidth is 1024 Kbit
Total delay is 41010 microseconds
Reliability is 255/255
Load is 161/255
Minimum MTU is 1500
Hop count is 3
External data:
Originating router is 154.202.1.166
AS number of route is 202
External protocol is EIGRP, external metric is 2816
Administrator tag is 202 (0x000000D4)
router>
________________________________________________________________
Ken Farrington
Global Networks, Barclays Capital, 5 The North Colonnade, Canary
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* Mob : 07768-866655
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