eigrp neighbor not showing

leblanc
leblanc used Ask the Experts™
on
I am trying to figure out why R2 does not see S2 as its eigrp nei (see diagram). R1 can see S1 and R2. The only difference is a L2 switch between R2 and S2.

diagram
R2#sh ip eigrp nei

IP-EIGRP neighbors for process 100

H   Address         Interface      Hold Uptime    SRTT   RTO   Q   Seq

                                   (sec)          (ms)        Cnt  Num

0   10.10.200.2     Gig0/0         12   01:02:56  40     1000  0   11

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R1#sh ip eigrp nei

IP-EIGRP neighbors for process 100

H   Address         Interface      Hold Uptime    SRTT   RTO   Q   Seq

                                   (sec)          (ms)        Cnt  Num

0   10.10.200.1     Gig0/0         12   01:03:19  40     1000  0   9

1   10.10.20.254                   13   00:41:23  40     1000  0   10

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S1#sh ip eigrp nei

IP-EIGRP neighbors for process 100

H   Address         Interface      Hold Uptime    SRTT   RTO   Q   Seq

                                   (sec)          (ms)        Cnt  Num

0   10.10.101.2     Gig0/2         13   00:43:10  40     1000  0   7

1   10.10.20.250    Vlan           11   00:42:57  40     1000  0   12

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S2#sh ip eigrp nei

IP-EIGRP neighbors for process 100

H   Address         Interface      Hold Uptime    SRTT   RTO   Q   Seq

                                   (sec)          (ms)        Cnt  Num

0   10.10.101.1     Vlan           12   00:43:56  40     1000  0   9

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Distinguished Expert 2018
Commented:
You did not provide enough details for correct answer. Problem could me as simple as configuration error (or few of those) and there is no configuration details. This is guessing game, I guess. :)
Anyway, from information that are available, IP addresses that are present on topology diagram R2 could be configured to be neighbor with L2 switch and not switch S2 (IP addresses on R2 10.10.10.250 and S2  (10.10.138/24, 10.10.100/24) are not in the same IP address range). L2 switches do not support EIGRP and  EIGRP neighbors that are not in the same IP address range will not established adjacency.
Your problem will be sort out if you either replace Layer 2 S1 or S2 switch to Layer 3 switch as L2 switch doesn't support routing. Or to see EIGRP neighbors from R2 to S2 they should be in the same subnet but that make no sense.
leblancAccounting

Author

Commented:
S1 and S2 are layer 3 switches.

Predrag,
I think you got it. "EIGRP neighbors that are not in the same IP address range will not established adjacency" I added an SVI 10 (which is in R2) in S2, I know have the S2 as eigrp neighbor from R2. Bascially, I need a L3 link so that eigrp can be advertised.

Now the strange thing is to reach 10.10.20.100, the preferred path is via R2 from S2 which is 2 hops away. I shutdown R2 and the traceroute shows that it is only 1 hop away from S2 to S1. Any idea why it takes the R2 S2 path instead of S2 S1. All the bandwidth are gigs.


S2#traceroute 10.10.20.100
Type escape sequence to abort.
Tracing the route to 10.10.20.100

  1   10.10.10.250    42 msec   4 msec    1 msec    
  2   10.10.200.2     0 msec    0 msec    0 msec    
  3   *     0 msec    0 msec    

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S2#traceroute 10.10.20.100
Type escape sequence to abort.
Tracing the route to 10.10.20.100

  1   10.10.101.1     2 msec    0 msec    0 msec    
  2   10.10.20.100    0 msec    14 msec   0 msec   

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Distinguished Expert 2018

Commented:
That would be too much to guess, it could be anything (including static route configured on S2 :) ).
Check routing table and EIGRP database on S2, it should give you some clue.
TimotiStDatacenter Technician
Top Expert 2012

Commented:
Can you post vlan trunk configs and gig interface configs from switch2?
Accounting
Commented:
I think there is a bug in GNS3. I rebuilt the lab and it is working as it should now.
leblancAccounting

Author

Commented:
I rebuilt the lab. I think there is a bug in GNS3

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