EIGRP output explanation..

Unanswered Question
Dec 11th, 2008

Hi All,

Can someone shed some light on the below EIGRP o/p.. Iam trying to figure out '0' successor meaning in R1 and is there anyway I can see the Successors IPs for the networks listed in R2 topology table.

R1:

#sh ip eigrp 29 topology

IP-EIGRP Topology Table for AS(29)/ID(192.168.101.3)

P 0.0.0.0/0, 0 successors, FD is Inaccessible, tag is 100

via 10.40.2.2 (55040/51200), GigabitEthernet3/4

via 10.40.1.2 (51456/51200), GigabitEthernet1/1

P 1.1.1.4/30, 0 successors, FD is Inaccessible

via 10.40.2.2 (55040/51200), GigabitEthernet3/4

via 10.40.1.2 (51456/51200), GigabitEthernet1/1

P 192.168.109.0/24, 0 successors, FD is Inaccessible

via 10.40.2.2 (55040/51200), GigabitEthernet3/4

via 10.40.1.2 (51456/51200), GigabitEthernet1/1

R2:

P 0.0.0.0/0, 1 successors, FD is 51200, tag is 100

via Redistributed (51200/0)

P 1.1.1.4/30, 1 successors, FD is 51200

via Redistributed (51200/0)

P 192.168.109.0/24, 1 successors, FD is 51200

via Redistributed (51200/0)

P 192.168.110.0/24, 1 successors, FD is 51200

via Redistributed (51200/0)

Thank you

MS

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lejoe.thomas Thu, 12/11/2008 - 14:45

hi Mehboob,

It looks like you're redistributing these routes in eigrp AS 29 or a possible route feedback

This reason why it shows FD as inaccessible is because R1 is not using eigrp routes for the prefixes in the routing table. There could another protocol with a better metric for those routes. Perhaps a show ip route for prefixes in the eigrp topology would help.

In your case since you'd like eigrp routes to be preferred, tweaking the administrative distance to be higher than 170 on the routes from routing protocol which is currently preferred would produce the desired result.

HTH

Lejoe

mvsheik123 Fri, 12/12/2008 - 09:08

Hi,

Thank you. So incase of R2, where it is showing as..

P 192.168.109.0/24, 1 successors, FD is 51200

via Redistributed (51200/0)

P 192.168.110.0/24, 1 successors, FD is 51200

via Redistributed (51200/0)

P 192.168.111.0/24, 1 successors, FD is 51200

via Redistributed (51200/0)

That means the Successors being learned via redistribution?How do i see who is the successor..?

Thank you

MS

lejoe.thomas Fri, 12/12/2008 - 19:13

Hi,

That means the Successors being learned via redistribution?

The routes are being redistributed into eigrp, however since the advertised distance is 0 (51200/0), these routes have better metric from another protocol and are not installed in the routing as being learnt from eigrp, since eigrp external routes have an administrative distance of 170.

How do i see who is the successor..?

Eigrp routes for these prefixes are not installed in the routing table, hence there is no successor shown.

Use sh ip eigrp topology [prefix]

should give details regarding the next-hop or successor

Use sh ip route [prefix] to see the details regarding prefix.

HTH

Lejoe

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