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EIGRP topology:How do I see which network is a router connected to ?

Hi there,

From looking at the EIGRP topology table, what is the approach to find out which networks is a given router connected to ?

For example, imagine I want to find out which networks is the router at 173.17.10.2 directly connected to ? What should I consider when looking into that information in the show EIGRP topology table shown below ?

RouterA#show ip eigrp topology all-links

P 173.17.3.128/25, 2 successors, FD is 30721, serno 9

via 173.17.10.2 (30721/28160), FastEthernet0/1

via 173.17.3.2 (30721/28160), FastEthernet0/3

P 192.168.0.0/24, 1 successors, FD is 156160, serno 16

via 173.17.0.2 (156160/120256), Fa0/0

via 173.17.10.2 (158720/156160), Fa0/1

P 173.17.10.0/24, 1 successors, FD is 20514560, serno 15

via Connected, Fa0/1

P 173.17.0.0/30, 1 successors, FD is 20514560, serno 15

via 182.16.1.1 (201514560/20512000), Fa0/2

via 173.17.10.2 (201518120/204514560), Fa0/1

P 173.17.1.0/24, 1 succssors, FD is 30721, serno 8

via 173.17.10.2 (30721/28160), Fa0/1

via 173.17.3.2 (33280/30721), Fa0/3

P 173.17.3.0/24, 1 sucessors, FD is 28160, serno 3

via Connected, Fa0/3

2 REPLIES
Hall of Fame Super Bronze

Re: EIGRP topology:How do I see which network is a router connec

The information is provided on the output. If the routes were learned from a remote router, you will see the IP address of the remote router after the 'via' while if the network is a 'connected' network, it will be shown as such.

In your case, you have 173.17.10.0/24 and 173.17.3.0/24 as 'Connected' networks.

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Thanks

New Member

Re: EIGRP topology:How do I see which network is a router connec

Initially I thought it was by looking at 'connected' as well, but then the answer from the book contradicts this approach. According to the book, the correct answer is that router 173.17.10.2 is directly connected to 3 networks:

173.17.2.0/24

173.17.3.128/25

192.168.0.0/24

Any idea what is the rationale used on this ?

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