Information Technology Reference
In-Depth Information
represent a path to reach the parent network, 172.16.0.0/16. If a packet destined for
172.16.0.0/16 does not match one of the level 2 child routes, it is sent to the Null0 interface:
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
The 192.168.10.0/24 network is also variably subnetted and includes a Null0 route:
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
View the routing table on the R3 router.
Step 2.
The routing table for R3 shows that both R1 and R2 are automatically summarizing the
172.16.0.0/16 network and sending it as a single routing update. Because of automatic
summarization, R1 and R2 are not propagating the individual subnets. Because R3 is get-
ting two equal-cost routes for 172.16.0.0/16 from both R1 and R2, both routes are includ-
ed in the routing table.
R3# show ip route
<output omitted>
D 172.16.0.0/16 [90/2172416] via 192.168.10.5, 01:15:35, Serial0/0/0
[90/2172416] via 192.168.10.9, 01:15:22, Serial0/0/1
C 192.168.1.0/24 is directly connected, FastEthernet0/0
192.168.10.0/24 is variably subnetted, 3 subnets, 2 masks
D 192.168.10.0/24 is a summary, 01:15:22, Null0
C 192.168.10.4/30 is directly connected, Serial0/0/0
C 192.168.10.8/30 is directly connected, Serial0/0/1
R3#
Task 8: Configure EIGRP Metrics
View the EIGRP metric information.
Step 1.
Use the show ip interface command to view the EIGRP metric information for the Serial
0/0/0 interface on the R1 router. Notice the values that are shown for the bandwidth, delay,
reliability, and load.
R1# show interface serial0/0/0
Serial0/0/0 is up, line protocol is up (connected)
Hardware is HD64570
Internet address is 172.16.3.1/30
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255
Encapsulation HDLC, loopback not set, keepalive set (10 sec)
<output omitted>
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