CompNtwk : Lab 6.1.4 Using CIDR to Ensure Route Summarization

Step 1: Cable and configure the network

Referring to the topology diagram, connect the console (or rollover) cable to the console port on the router and the other cable end to the host computer with a DB-9 or DB-25 adapter to the COM 1 port. Ensure that power has been applied to both the host computer and router.

Step 2: Perform basic router configurations

Establish a HyperTerminal, or other terminal emulation program, from PC1 to each of the three routers in turn and perform the following configuration functions:

Clear any existing configurations on the routers.

Configure the router hostname.

Disable DNS lookup.

Configure an EXEC mode password.

Configure a message-of-the-day banner.

Configure a password for console connections.

Configure a password for vty connections.

Step 3: Configure the interfaces on the three routers

Configure the interfaces on the three routers with the IP addresses from the table.

Save the running configuration to the NVRAM of the router.

Step 4: Configure the Ethernet interfaces

Configure the Ethernet interfaces of Hosts PC1, PC2, and PC3 with the IP addresses from the addressing

table provided under the topology diagram.

Step 5: Verify connectivity of routers

Verify that each router can ping each of the neighboring routers across the WAN links. You should

not have connectivity between end devices yet. However, you can test connectivity between two

routers and between an end device and its default gateway. Troubleshoot if connectivity is not achieved.

Step 6: Verify connectivity of Host PCs

Verify that PC1, PC2, and PC3 can ping their respective default gateways. Troubleshoot if connectivity is not achieved.

Step 7: Configure EIGRP routing on router R1

Consider the networks that need to be included in the EIGRP updates that are sent out by the R1 router.

What directly connected networks exist on R1?

172.17.0.0

172.18.0.0

172.19.0.0

What commands are required to enable EGIRP and include the connected networks in the routing updates?

router eigrp 1

network 172.17.0.0

network 172.18.0.0

network 172.19.0.0

Are there any router interfaces that do not need to have EIGRP updates sent out? Ya

If yes, which ones? Fa0/0 and Fa0/1

What command is used to disable EIGRP updates on these interfaces?

passive-interface FastEthernet0/0 and passive-interface FastEthernet0/1

Step 8: Configure EIGRP on router R2

Consider the networks that need to be included in the EIGRP updates that are sent out by the R2 router.

What directly connected networks exist on R2?

172.16.0.0

172.17.0.0

172.20.0.0

What commands are required to enable EGIRP and include the connected networks in the routing updates?

router eigrp 1

network 172.16.0.0

network 172.17.0.0

network 172.20.0.0

Are there any router interfaces that do not need to have EIGRP updates sent out?Ya

If yes, which ones?

Fa0/0 and Fa0/1

What command is used to disable EIGRP updates on these interfaces?

passive-interface FastEthernet0/0

Step 9: Configure EIGRP routing on the R3 router

Consider the networks that need to be included in the EIGRP updates that are sent out by the R3 router.

What directly connected networks exist on R3?

172.20.0.0

10.1.0.0

What commands are required to enable EGIRP and include the connected networks in the routing updates?

router eigrp 1

network 172.20.0.0

network 10.1.0.0

Are there any router interfaces that do not need to have EIGRP updates sent out?Ya

If yes, which ones?Fa0/0 and Fa0/1

What command is used to disable EIGRP updates on these interfaces?

passive-interface FastEthernet0/0

Step 10: Verify the configurations

Ping between devices to confirm that each router can reach each device on the network and that there is

connectivity between all the PCs. If any of the above pings failed, check your physical connections and configurations. Troubleshoot until connectivity is achieved.

Step 11: Display the EIGRP routing table for each router

Are there summary routes in any of the routing tables?

Ya, tetapi hanya untuk jaringan 10.1.0.0. Auto-summary EIGRP diaktifkan secara default dan merangkum subnetwork 10.1.0.0/16 ke jaringan 10.0.0.0 / 8 classful.

Are there any summary routes for the 172.x.0.0 networks?Tidak

Step 12: Remove automatic summarization

On each of the three routers, remove automatic summarization to force EIGRP to report all subnets. A sample command is given for R1.

R1(config)#router eigrp 1

R1(config-router)#no auto-summary

Step 13: Configure manual summarization on R2

On R2, configure manual summarization so that EIGRP summarizes the four networks 172.16.0.0/16,

172.17.0.0/16, 172.18.0.0/16, and 172.19.0.0/16 as one CIDR route, or 172.16.0.0/14.

You are summarizing multiple classful networks, which creates a supernet, and results in a classless (/14)

network address being advertised.

R2(config)#interface s0/0/1

R2(config-if)#ip summary-address eigrp 1 172.16.0.0 255.252.0.0

Step 14: Confirm that R2 is advertising a CIDR summary route

Examine the routing table of each router using the show ip route command.

R1#show ip route

Codes: C – connected, S – static, 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

i – IS-IS, su – IS-IS summary, 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

C 172.17.0.0/16 is directly connected, Serial0/0/0

D 172.16.0.0/16 [90/2172416] via 172.17.0.2, 02:13:05, Serial0/0/0

C 172.19.0.0/16 is directly connected, Loopback0

C 172.18.0.0/16 is directly connected, FastEthernet0/0

D 172.20.0.0/16 [90/2681856] via 172.17.0.2, 02:05:21, Serial0/0/0

10.0.0.0/16 is subnetted, 1 subnets

D 10.1.0.0 [90/2684416] via 172.17.0.2, 00:04:25, Serial0/0/0

R2#show ip route

Codes: C – connected, S – static, 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

i – IS-IS, su – IS-IS summary, 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

C 172.17.0.0/16 is directly connected, Serial0/0/0

C 172.16.0.0/16 is directly connected, FastEthernet0/0

D 172.19.0.0/16 [90/2172416] via 172.17.0.1, 02:14:37, Serial0/0/0

D 172.18.0.0/16 [90/2172416] via 172.17.0.1, 02:14:37, Serial0/0/0

C 172.20.0.0/16 is directly connected, Serial0/0/1

10.0.0.0/16 is subnetted, 1 subnets

D 10.1.0.0 [90/2172416] via 172.20.0.1, 00:05:57, Serial0/0/1

D 172.16.0.0/14 is a summary, 00:11:55, Null0

R3#show ip route

Codes: C – connected, S – static, 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

i – IS-IS, su – IS-IS summary, 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

C 172.20.0.0/16 is directly connected, Serial0/0/1

10.0.0.0/16 is subnetted, 1 subnets

C 10.1.0.0 is directly connected, FastEthernet0/0

D 172.16.0.0/14 [90/2172416] via 172.20.0.2, 00:13:32, Serial0/0/1

Which router has a summarized route to the 172.x.0.0 networks in its routing table?

R3

D 172.16.0.0/14 [90/2172416] via 172.20.0.2, 00:13:32, Serial0/0/1

 

Step 15: Clean up

Erase the configurations and reload the routers. Disconnect and store the cabling. For PC hosts that are

normally connected to other networks (such as the school LAN or to the Internet), reconnect the appropriate cabling and restore the TCP/IP settings.

Reflection

In this lab, automatic summarization was used. Could route summarization still be applied if more effective use of the IPv4 address space had been made by using VLSM for those networks requiring fewer addresses, such as the serial links between routers?

 

Leave a Reply

Fill in your details below or click an icon to log in:

WordPress.com Logo

You are commenting using your WordPress.com account. Log Out / Change )

Twitter picture

You are commenting using your Twitter account. Log Out / Change )

Facebook photo

You are commenting using your Facebook account. Log Out / Change )

Google+ photo

You are commenting using your Google+ account. Log Out / Change )

Connecting to %s

%d bloggers like this: