EIGRP Router ID is an important component to EIGRP and is a way for EIGRP to identify each router that is participating in the EIGRP ASN domain.
The EIGRP enabled router uses the following 3 steps to determine its ID:
- Manual configuration within the EIGRP config
- Highest IPv4 address on an enabled and operating loopback interface
- Highest IPv4 address on an enabled and operating non loopback interface
Manually configuring an EIGRP Router ID: