For EIGRP routers to form a neighbor relationship, both routers must share a directly connected
IP subnet. A log message that displays that EIGRP neighbors are ???not on common subnet???
indicates that an improper IP address exists on one of the two EIGRP neighbor interfaces. Use the
show interface interface command to verify the IP addresses.
Example 5-9 Con?¬?rming EIGRP Neighbor Relationships
RouterX# sshhooww iipp eeiiggrrpp nneeiigghhbboorrss
IP-EIGRP neighbors for process 100
H Address Interface Hold Uptime SRTT RTO Q Seq
(sec) (ms) Cnt Num
1 10.23.23.2 Se0/0/1 13 00:02:26 29 2280 0 15
0 10.140.1.1 Se0/0/0 10 00:28:26 24 2280 0 25
Troubleshoot
EIGRP Neighbor
Relationships
Troubleshoot
EIGRP Routing
Table Issues
Troubleshoot
EIGRP
Authentication
Are all
interface statuses
up/up?
Are you
receiving ???Not on
common subnet???
error?
Are all
required EIGRP
neighbors
configured?
Does
all required
hello packet
information match
neighbor?
194 Chapter 5: Implementing EIGRP
In the output in Example 5-10, the interface address is 10.2.2.3/24.
The network command that is con?¬?gured under the EIGRP routing process indicates which router
interfaces will participate in EIGRP.
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