CCNA 3 Labs and Study Guide - BINARYBB.INFO – @jagalbraith

RTA(config-if)#ip summary-address rip 10.1.0.0 ?
A.B.C.D IP network mask
RTA(config-if)#ip summary-address rip 10.1.0.0 255.255.248.0 ?
RTA(config-if)#ip summary-address rip 10.1.0.0 255.255.248.0
RTA(config-if)#end
Notice the subnet mask matches the summary of all the simulated LANs for RTA. This summary should
conform to the subnet the student determined in Task 1, Step 1 above.
Next, encourage the students to use other commands besides show run and show ip route to see the effect
of this configuration. A powerful command that displays routing configuration information is show ip protocols.
Notice the highlighted portion of the output shows the summary route.
RTA#show ip protocols
Routing Protocol is “rip”
Sending updates every 30 seconds, next due in 23 seconds
Invalid after 180 seconds, hold down 180, flushed after 240
Outgoing update filter list for all interfaces is not set
Incoming update filter list for all interfaces is not set
Redistributing: rip
Default version control: send version 2, receive version 2
Interface Send Recv Triggered RIP Key-chain
Serial0/0 2 2
Loopback1 2 2
Loopback2 2 2
Loopback3 2 2
Loopback4 2 2
Automatic network summarization is not in effect
Address Summarization:
10.1.0.0/21 for Serial0/0
Maximum path: 4
Routing for Networks:
10.0.0.0
172.16.0.0
Routing Information Sources:
Gateway Distance Last Update
172.16.1.2 120 00:00:10
Distance: (default is 120)
Chapter 1: Introduction to Classless Routing 91
Now verify that RTB has received the new summary route as highlighted in the following output. All the
routes may be listed, including the /25 routes, because RIP has not yet timed out these routes. You can
either wait for the /25 routes to be flushed or simply refresh the routing table by using the clear ip route *
command.
RTB#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