EIGRP is a very interesting distance vector routing protocol that offers advanced options. It is preferably used in certain scenarios such as VPNs, DMVPN, etc.
EIGRP exists in two modes of operation: classic and named.
Of course, depending on the IP protocol used in the network, for each mode there are two possibilities: Classic EIGRPv4, Classic EIGRPv6, Named EIGRP with IPv4 address family, and Named EIGRP with IPv6 address family.
The scenario is: what if all these cases are grouped within the same network, and a router is configured to maintain EIGRP with all its variants! Is there a magic command that can display and verify all parameters at once?
Like OSPF, for example, you cannot display with a single command the parameters of OSPFv2 and OSPFv3 for IPv4 and IPv6.
With the command show eigrp protocols, you can display all the fundamental EIGRP configuration parameters in a single check! This command is crucial and less frequently used by engineers for initial troubleshooting compared to show ip protocols, because it instantly verifies the consistency of the basic configuration (AS, K-values, Router-ID, etc.).
Here is our topology, and I will not go into detailed configuration, as that is not the goal of this blog.

Here is a general overview of the EIGRP configuration on R1. Note that we have different types of EIGRP instances to cover all possible cases.

Let's now see what the show eigrp protocols command will display on R1!

Yes, indeed! As you can see, with a single command, you get relevant information about all EIGRP instances, regardless of their type: classic EIGRPv4, EIGRPv6, or Named according to the address family. This is a feature not found, for example, with OSPF, BGP, or RIP.
I look forward to showing you another magic command of the EIGRP protocol!
My GitHub