Contents
What are the conditions for eigrp neighbors?
Table 4-4 Neighbor Requirements for EIGRP and OSPF
| Requirement | EIGRP | OSPF |
|---|---|---|
| Interfaces’ primary IP addresses must be in same subnet. | Yes | Yes |
| Must not be passive on the connected interface. | Yes | Yes |
| Must use the same ASN (EIGRP) or process-ID (OSPF) in the router configuration command. | Yes | No |
How do I clear my eigrp neighbor?
To remove and reestablish the Enhanced Interior Gateway Routing Protocol (EIGRP) neighbor entries from the appropriate table, use the clear ip eigrp neighbors command.
How eigrp establish neighbor relationships?
Through the hello protocol, an EIGRP router dynamically discovers other EIGRP routers directly connected to it. When an EIGRP router receives a hello packet from a router belonging to the same autonomous system (AS), it establishes a neighbor relationship (adjacency).
How do I check EIGRP?
To verify that the router recognizes EIGRP routes for any neighbors, use the show ip route eigrp command, as shown in Example 3-26. Example 3-27 exhibits the show ip route command, which displays the full IP routing table, including the EIGRP routes.
Why is my EIGRP neighbor not on common subnet?
According to the troubleshooting flowchart in Figure 7-5, the three causes of getting the “EIGRP neighbor not on common subnet” error message are the following: The IP address has been misconfigured on interfaces. The primary and secondary IP addresses of the neighboring interface don’t match.
What happens to EIGRP when an interface goes down?
When an interface goes down, EIGRP takes down the neighbors that are reachable through that interface and flushes all routes learned through that neighbor. Misconfigured hello and hold intervals. The EIGRP hold interval can be set independently of the hello interval if you issue the ip hold-time eigrp command.
What do you need to know about EIGRP?
EIGRP is an advanced distance vector routing protocol that has to establish a neighbor relationship before updates are sent. Because of this the first thing we’ll have to do is check if the neighbor adjacency is working properly.
How to troubleshoot flapping neighbors with Cisco EIGRP?
You can use these commands in order to troubleshoot flapping neighbors: 1 show eigrp interface detail 2 show ip eigrp neighbor detail 3 ping unicast 4 ping with size full MTU 5 ping with “verify reply data” 6 ping multicast 7 debug eigrp packet (hello) 8 show ip eigrp traffic 9 show ip traffic | begin EIGRP