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EIGRP Router not populating topology table with expected route (Lab)

Chris Murray
Cisco Employee
Cisco Employee

‎11-30-2014 07:33 PM - edited ‎03-07-2019 09:43 PM

I cannot figure out why Core1 isn't learning backup routes to the loopback subnets on lan 1 and lan 2. I understand why they wouldn't be FS routes, but shouldn't they still be in the topology table?

Here's an output from Core 1's topology table:

Core1#show ip eigrp topo all
IP-EIGRP Topology Table for AS(1)/ID(192.168.6.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.2.1.0/24, 1 successors, FD is 435200, serno 29
        via 192.168.6.1 (435200/409600), FastEthernet0/1
P 10.1.0.0/24, 1 successors, FD is 435200, serno 52
        via 192.168.5.1 (435200/409600), FastEthernet0/0
P 10.1.7.0/24, 1 successors, FD is 435200, serno 53
        via 192.168.5.1 (435200/409600), FastEthernet0/0
P 10.2.7.0/24, 1 successors, FD is 435200, serno 30
        via 192.168.6.1 (435200/409600), FastEthernet0/1
P 192.168.1.0/24, 1 successors, FD is 307200, serno 10
        via 192.168.6.1 (307200/281600), FastEthernet0/1
P 192.168.2.0/24, 1 successors, FD is 25651200, serno 26
        via 192.168.6.1 (25651200/25625600), FastEthernet0/1
        via 192.168.5.1 (25676800/25651200), FastEthernet0/0
P 192.168.3.0/24, 1 successors, FD is 25651200, serno 54
        via 192.168.5.1 (25651200/25625600), FastEthernet0/0
        via 192.168.6.1 (25676800/25651200), FastEthernet0/1
P 192.168.4.0/24, 1 successors, FD is 307200, serno 51
        via 192.168.5.1 (307200/281600), FastEthernet0/0

P 192.168.5.0/24, 1 successors, FD is 281600, serno 1
        via Connected, FastEthernet0/0
P 192.168.6.0/24, 1 successors, FD is 281600, serno 9
        via Connected, FastEthernet0/1

 

Any insight is appreciated!, Thank you!

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Frederick Damstra
Level 1
Level 1

‎11-30-2014 07:42 PM

We'll need to know more about your topology to answer your question.  You won't learn the routes if they're being filtered earlier on.  But you should see them if they're from a direct neighbor.

'show ip eigrp neigh' will tell you if you're forming neighbor relationships.

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Chris Murray
Cisco Employee
Cisco Employee
In response to Frederick Damstra

‎11-30-2014 07:52 PM

Thanks for taking a look Fred. Did you get a chance to look at the topology table? I've have not configured any filtering. All neighborships in the topology have formed, the core router just doesn't seem to want to populate the topology table with non-successor routes it sees from Distro 1 and Distro 2. I've confirmed that Distro 1 and Distro 2 are advertising the routes to Core 1.

 

Example output from Distro 2:

 

*Mar  1 00:35:54.447: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.1.0/24 - do advertise out FastEthernet1/0
*Mar  1 00:35:54.447: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.1.0/24 metric 25753600 - 25600000 153600
*Mar  1 00:35:54.447: IP-EIGRP(Default-IP-Routing-Table:1): 10.2.7.0/24 - do advertise out FastEthernet1/0
*Mar  1 00:35:54.447: IP-EIGRP(Default-IP-Routing-Table:1): Int 10.2.7.0/24 metric 25753600 - 25600000 153600

 

(Distro 2 is connected to Core1 on fa 1/0.)

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johnlloyd_13
Level 9
Level 9

‎11-30-2014 07:57 PM

hi,

try using show eigrp topology all-links instead.

this will show you all possible routes including those that are neither successor nor FS.

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Chris Murray
Cisco Employee
Cisco Employee
In response to johnlloyd_13

‎11-30-2014 08:01 PM

Hello John,

"show ip eigrp topo all" is an abbreviated form of "show ip eigrp topology all-links" the output would be the same but I've included it for your reference.

Core1#show ip eigrp topo all-links
IP-EIGRP Topology Table for AS(1)/ID(192.168.6.2)

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 10.2.1.0/24, 1 successors, FD is 435200, serno 52
        via 192.168.6.1 (435200/409600), FastEthernet0/1
P 10.1.0.0/24, 1 successors, FD is 435200, serno 40
        via 192.168.5.1 (435200/409600), FastEthernet0/0
P 10.1.7.0/24, 1 successors, FD is 435200, serno 41
        via 192.168.5.1 (435200/409600), FastEthernet0/0
P 10.2.7.0/24, 1 successors, FD is 435200, serno 53
        via 192.168.6.1 (435200/409600), FastEthernet0/1
P 192.168.1.0/24, 1 successors, FD is 307200, serno 50
        via 192.168.6.1 (307200/281600), FastEthernet0/1
P 192.168.2.0/24, 1 successors, FD is 25651200, serno 51
        via 192.168.6.1 (25651200/25625600), FastEthernet0/1
        via 192.168.5.1 (25676800/25651200), FastEthernet0/0
P 192.168.3.0/24, 1 successors, FD is 25651200, serno 38
        via 192.168.5.1 (25651200/25625600), FastEthernet0/0
        via 192.168.6.1 (25676800/25651200), FastEthernet0/1
P 192.168.4.0/24, 1 successors, FD is 307200, serno 39
        via 192.168.5.1 (307200/281600), FastEthernet0/0

Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
       r - reply Status, s - sia Status

P 192.168.5.0/24, 1 successors, FD is 281600, serno 3
        via Connected, FastEthernet0/0
P 192.168.6.0/24, 1 successors, FD is 281600, serno 4
        via Connected, FastEthernet0/1

0 Helpful

johnlloyd_13
Level 9
Level 9
In response to Chris Murray

‎11-30-2014 08:20 PM

right my bad.

how about issuing the following on Core1 and post it here?

show ip eigrp topology 10.1.0.0/24

show ip eigrp topology 10.1.7.0/24

show ip eigrp topology 10.2.0.0/24

show ip eigrp topology 10.2.7.0/24

show ip eigrp topology 10.1.0.0/24

 

show ip route 10.1.0.0 255.255.255.0

show ip route 10.1.7.0.0 255.255.255.0

show ip route 10.2.0.0 255.255.255.0

show ip route 10.2.7.0 255.255.255.0

 

it would be also helpful if you could post the config of all routers.

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