Information Technology Reference
In-Depth Information
Redistributing: eigrp 1
Automatic network summarization is in effect
Automatic address summarization:
Maximum path: 4
Routing for Networks:
172.16.0.0
192.168.10.4/30
Routing Information Sources:
Gateway Distance Last Update
172.16.3.2 90 4811399
192.168.10.6 90 5411677
Distance: internal 90 external 170
Notice that the output specifies the process ID used by EIGRP. Remember, the process ID
must be the same on all routers for EIGRP to establish neighbor adjacencies and share
routing information.
Task 7: Examine EIGRP Routes in the Routing Tables
View the routing table on the R1 router.
Step 1.
EIGRP routes are denoted in the routing table with a
D
, which stands for DUAL
(Diffusing Update Algorithm), which is the routing algorithm used by EIGRP.
R1#
show ip route
Codes: C - connected, S - static, I - IGRP, R - RIP, M - mobile, B - BGP
D - EIGRP, EX - EIGRP external, O - OSPF, IA - OSPF inter area
N1 - OSPF NSSA external type 1, N2 - OSPF NSSA external type 2
E1 - OSPF external type 1, E2 - OSPF external type 2, E - EGP
i - IS-IS, L1 - IS-IS level-1, L2 - IS-IS level-2, ia - IS-IS inter
area
* - candidate default, U - per-user static route, o - ODR
P - periodic downloaded static route
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 4 subnets, 3 masks
D 172.16.0.0/16 is a summary, 01:16:19, Null0
C 172.16.1.0/24 is directly connected, FastEthernet0/0
D 172.16.2.0/24 [90/2172416] via 172.16.3.2, 01:16:20, Serial0/0/0
C 172.16.3.0/30 is directly connected, Serial0/0/0
D 192.168.1.0/24 [90/2172416] via 192.168.10.6, 01:06:18, Serial0/0/1
192.168.10.0/24 is variably subnetted, 3 subnets, 2 masks
D 192.168.10.0/24 is a summary, 01:06:07, Null0
C 192.168.10.4/30 is directly connected, Serial0/0/1
D 192.168.10.8/30 [90/2681856] via 192.168.10.6, 01:06:07, Serial0/0/1
R1#
Notice that the 172.16.0.0/16 parent network is variably subnetted with three child routes
using either a /24 or /30 mask. Also notice that EIGRP has automatically included a summary
route to Null0 for the 172.16.0.0/16 network. The 172.16.0.0/16 route does not actually
