Hi all,
I have a question about EIGRP Topology table. As I know, if there is many
path can go to a network, the EIGRP topology table will only stores the
route of the "Successor" and the "Feasible Successor". The path will become
"Feasible Successor" if its "Reported Distance" is less than the "Feasible
Distance". However, I found the following in my network:
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R1#show ip eigrp topology 172.20.178.0 255.255.255.0
IP-EIGRP topology entry for 172.20.178.0 255.255.255.0
State is Passive, Query origin flag is 1, 1 Successor(s), FD is 675072
Routing Descriptor Blocks:
172.20.100.1 (Ethernet1), from 172.20.100.1, Send flag is 0x0
Composite metric is (675072/649472), Route is Internal
Vector metric:
Minimum bandwidth is 6146 Kbit
Total delay is 10100 microseconds
Reliability is 255/255
Load is 24/255
Minimum MTU is 1500
Hop count is 2
172.20.31.2 (Serial2), from 172.20.31.2, Send flag is 0x0
Composite metric is (3258880/2330112), Route is Internal
Vector metric:
Minimum bandwidth is 1536 Kbit
Total delay is 62200 microseconds
Reliability is 255/255
Load is 7/255
Minimum MTU is 1500
Hop count is 6
172.20.32.2 (Serial5), from 172.20.32.2, Send flag is 0x0
Composite metric is (2462720/1789952), Route is Internal
Vector metric:
Minimum bandwidth is 1536 Kbit
Total delay is 31100 microseconds
Reliability is 255/255
Load is 44/255
Minimum MTU is 1500
Hop count is 3
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When I show the EIGRP topology table in R1, it show 3 routes (I think 1 is
the Successor and 2 are the Feasible Successor). Actually, there should be 5
routing path can reach the network "172.20.178.0", it only display 3 of
them, I think it is due to the other 2 have greater "Reported Distance" and
they cannot become the "Feasible Successor". Is that true?
My another question is: when R1 go to network "172.20.178.0", it chooses the
router "172.20.100.1" and the "Feasible Distance" is 675072. The "Reported
Distance" of the path through the router "172.20.31.2" and "172.20.32.2" are
"2330112" and "1789952" which are much greater than the "Feasible Distance".
They should not be stored in the topology table. How come they will
displayed in the table? Please help.
Regards.
dovelet
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