Information Technology Reference
In-Depth Information
Display the routing table on RTA.
Step 2.
RTA#
show ip route
(output omitted)
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 2 subnets, 2 masks
D 172.16.0.0/16 is a summary, 00:23:16, Null0
C 172.16.0.0/18 is directly connected, FastEthernet0/0
10.0.0.0/8 is variably subnetted, 2 subnets, 2 masks
D 10.0.0.0/8 is a summary, 00:23:20, Null0
C 10.0.0.0/30 is directly connected, Serial0/0/1
Notice that RTA does not have routes to the simulated LANs on RTB and RTC. Enter the
command to disable automatic summarization on all three routers.
Step 3.
Each router should have the
no auto-summary
command configured within the EIGRP
routing process.
Task 4: Configure Manual Summarization
Display the routing table on RTA.
Step 1.
RTA#
show ip route
(output omitted)
Gateway of last resort is not set
172.16.0.0/16 is variably subnetted, 9 subnets, 3 masks
D 172.16.160.0/19 [90/2297856] via 10.0.0.2, 00:00:16, Serial0/0/1
D 172.16.128.0/19 [90/2297856] via 10.0.0.2, 00:00:16, Serial0/0/1
D 172.16.224.0/19 [90/2297856] via 10.0.0.2, 00:00:16, Serial0/0/1
D 172.16.192.0/19 [90/2297856] via 10.0.0.2, 00:00:16, Serial0/0/1
C 172.16.0.0/18 is directly connected, FastEthernet0/0
D 172.16.112.0/20 [90/2297856] via 10.0.0.9, 00:00:29, Serial0/0/0
D 172.16.96.0/20 [90/2297856] via 10.0.0.9, 00:00:30, Serial0/0/0
D 172.16.80.0/20 [90/2297856] via 10.0.0.9, 00:00:30, Serial0/0/0
D 172.16.64.0/20 [90/2297856] via 10.0.0.9, 00:00:30, Serial0/0/0
10.0.0.0/30 is subnetted, 3 subnets
C 10.0.0.8 is directly connected, Serial0/0/0
C 10.0.0.0 is directly connected, Serial0/0/1
D 10.0.0.4 [90/21024000] via 10.0.0.9, 00:00:30, Serial0/0/0
[90/21024000] via 10.0.0.2, 00:00:30, Serial0/0/1
Notice that RTA has 12 routes. Some of these routes can be summarized to reduce the size
of the routing table. On RTB and RTC, enter the command to summarize the simulated
LANs into one summary route.
Step 2.
The simulated LANs on RTB share the same bit pattern for the first 21 bits of the network
prefix 172.16.128.0.
The simulated LANS on RTC share the same bit pattern for the first 18 bits of the network
prefix 172.16.64.0.
