Information Technology Reference
In-Depth Information
Configure the Ethernet interfaces of PC1, PC2, and PC3.
Step 3.
Configure these interfaces with the IP addresses and default gateways from Table 9-4.
Task 4: Configure EIGRP on the R1 Router
Enable EIGRP.
Step 1.
Use the
router eigrp
command in global configuration mode to enable EIGRP on the R1
router. Enter a process ID of 1 for the
autonomous-system
parameter:
R1(config)#
router eigrp 1
R1(config-router)#
Configure the classful network 172.16.0.0.
Step 2.
When you are in the Router EIGRP configuration submode, configure the classful network
172.16.0.0 to be included in the EIGRP updates that are sent out of R1:
R1(config-router)#
network 172.16.0.0
R1(config-router)#
The router will begin to send EIGRP update messages out each interface belonging to the
172.16.0.0 network. EIGRP updates will be sent out of the FastEthernet 0/0 and Serial
0/0/0 interfaces because they are both on subnets of the 172.16.0.0 network.
Configure the router to advertise the 192.168.10.4/30 network attached to the Serial 0/0/1
interface.
Step 3.
Use the
wildcard-mask
option with the
network
command to advertise only the subnet
and not the entire 192.168.10.0 classful network:
R1(config-router)#
network 192.168.10.4 0.0.0.3
R1(config-router)#
Note:
Think of a wildcard mask as the inverse of a subnet mask. The inverse of the subnet mask
255.255.255.252 is 0.0.0.3. To calculate the inverse of the subnet mask, subtract the subnet mask from
255.255.255.255:
255.255.255.255
- 255.255.255.252 Subtract the subnet mask
-------------------
0. 0. 0. 3 Wildcard mask
When you are finished with the EIGRP configuration for R1, return to privileged EXEC
mode and save the current configuration to NVRAM:
R1(config-router)#
end
%SYS-5-CONFIGI: Configured from console by console
R1#
