You want to check the status of EIGRP on the router.
There are several useful commands for looking at EIGRP status. As we have seen throughout this chapter, the show ip protocols command displays a wealth of useful information:
Router1#show ip protocols
You can look at a routing table of only those routes that were learned via EIGRP as follows:
Router1#show ip route eigrp
Another extremely useful EIGRP command displays a table of all of the adjacent EIGRP routers:
Router1#show ip eigrp neighbors
You can see information about the interfaces that exchange routing information using EIGRP with this command:
Router1#show ip eigrp interfaces
Finally, you can view the EIGRP topology database as follows:
Router1#show ip eigrp topology
The precise output of the show ip protocols command varies depending on what features are enabled. However, we have shown several examples of different output throughout this chapter:
Router1#show ip protocols
Routing Protocol is "eigrp 55"
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Serial0.1 filtered by (prefix-list) Inbound
Default networks flagged in outgoing updates
Default networks not accepted from incoming updates
EIGRP metric weight K1=1, K2=0, K3=1, K4=0, K5=0
EIGRP maximum hopcount 100
EIGRP maximum metric variance 1
Redistributing: static, eigrp 55
Automatic network summarization is not in effect
Maximum path: 4
Routing for Networks:
172.25.2.2/32
172.25.0.0
192.168.20.0
Routing Information Sources:
Gateway Distance Last Update
(this router) 90 5d23h
172.25.2.1 90 00:03:32
Distance: internal 90 external 170
Router1#
The standard command to view the IP routing table is show ip route. However, this will show you all of the IP routes, including static routes, connected routes, routes learned through other protocols, and EIGRP routes. If you just want to see the EIGRP routes, you can add the keyword eigrp to this command:
Router1#show ip route eigrp D*EX 0.0.0.0/0 [170/91942912] via 172.25.2.1, 00:04:29, Serial0.1 Router1#
One of the most useful commands when troubleshooting EIGRP problems looks at the neighbor table:
Router1#show ip eigrp neighbors
IP-EIGRP neighbors for process 55
H Address Interface Hold Uptime SRTT RTO Q Seq Type
(sec) (ms) Cnt Num
1 172.25.2.2 Se0/0.2 7 00:25:16 641 3846 0 148
2 172.25.1.7 Fa0/0.1 80 1w0d 17 200 0 406
0 172.22.1.4 Fa0/1 12 1w0d 3 200 0 259
Router1#
There are several important pieces of information in this list. Obviously, it's useful to look at the IP addresses and interfaces. But it can also be extremely useful to look at the uptime. In this case, two of these neighbors have been up and stable for a week, but the third was reset 25 minutes ago. The router will sort this output so that the most recent neighbors are at the top. This gives you an immediate way to see which neighbors might have problems.
Also useful in this output is the "Q" column. This column tells you how many EIGRP packets are currently queued for the specified neighbor. If the router is consistently queueing EIGRP packets, there may be a congestion or queueing problem with this interface.
If you think you see EIGRP congestion or performance problems like this, it can be useful to look at the interfaces in more detail:
Router1#show ip eigrp interfaces
IP-EIGRP interfaces for process 55
Xmit Queue Mean Pacing Time Multicast Pending
Interface Peers Un/Reliable SRTT Un/Reliable Flow Timer Routes
Fa0/0.1 1 0/0 17 0/10 50 0
Lo0 0 0/0 0 0/10 0 0
Fa0/1 1 0/0 3 0/10 50 0
Se0/0.2 1 0/0 641 0/15 3163 0
Router1#
This command shows useful information, such as how many peers there are on each interface. It also tells you more about any possible queueing issues, breaking out exactly how many routes are still pending.
Another useful command when debugging EIGRP problems is the show ip eigrp toplogy command. This command gives a view of the EIGRP topology table. The topology table is useful because it often includes information about routes that EIGRP has received, but that the router isn't using for whatever reason. For example, if there is a similar route with a better administrative distance, such as a static route, the show ip route command will indicate only the static route. The show ip eigrp toplogy command allows you to look through the whole EIGRP topology table to see exactly why the other route is better:
Router1#show ip eigrp topology
IP-EIGRP Topology Table for AS(55)/ID(172.25.25.1)
Codes: P - Passive, A - Active, U - Update, Q - Query, R - Reply,
r - reply Status, s - sia Status
P 0.0.0.0/0, 1 successors, FD is 28160, tag is 5
via Rstatic (28160/0)
via Summary (28160/0), Null0
P 10.2.2.0/24, 1 successors, FD is 156160
via 172.22.1.4 (156160/128256), FastEthernet0/1
P 10.1.1.0/30, 1 successors, FD is 3845120
via Connected, Serial0/1
P 192.168.10.0/24, 1 successors, FD is 28160, tag is 5
via Rstatic (28160/0)
P 192.168.30.0/24, 1 successors, FD is 156160
via 172.22.1.4 (156160/128256), FastEthernet0/1
P 192.168.20.0/24, 1 successors, FD is 2195456
via 172.25.2.2 (2195456/281600), Serial0/0.2
P 172.25.25.6/32, 1 successors, FD is 156160
via 172.25.1.7 (156160/128256), FastEthernet0/0.1
P 172.25.25.1/32, 1 successors, FD is 128256
via Connected, Loopback0
P 172.25.25.2/32, 1 successors, FD is 2297856
via 172.25.2.2 (2297856/128256), Serial0/0.2
P 172.25.1.0/24, 1 successors, FD is 28160
via Connected, FastEthernet0/0.1
P 172.25.2.0/30, 1 successors, FD is 2169856
via Connected, Serial0/0.2
P 172.22.1.0/24, 1 successors, FD is 28160
via Connected, FastEthernet0/1
Router1#
The EIGRP topology table also shows the successors for each route. The successor is the route that will be installed in case the better one goes away.
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