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ICND2 Skill Builders
Part 3: IP Routing Protocols
Lab 27: OSPF Frame Relay Configuration I
Overview
This lab begins with a working internetwork with valid IP addresses on all routers and PCs and with
OSPF fully configured on R1, R2, and R3. This lab shows the OSPF configuration of R4 and the
resulting routing tables.
Topology
10.2.1.0/27
S0/0/0
PC2
R2
Fa0/0
10.102.1.0/28
DLCI 101
DLCI 102 –
10.102.1.1
Fa0/0
PC1
10.1.1.1
S0/0/0
S0/0/0
10.3.1.0/27
R1
10.103.1.0/28
DLCI 101
PC3
10.1.1.0/27
DLCI 103 –
R3
Fa0/0
10.103.1.1
DLCI 104 –
10.104.1.1
10.4.1.0/27
10.104.1.0/28
PC4
R4
Fa0/0
DLCI 101
S0/0/0
Figure 1
Network Topology for This Lab
page 1
© 2009 Pearson Education, Inc. All rights reserved. This publication is protected by copyright.

Detailed Lab Steps
Step 1.
Connect to R4 from the simulator user interface using the password ciscopress.
Step 2.
Show the current IP-enabled interfaces by issuing the show ip interface brief command.
Write down the configured interfaces and IP addresses.
Step 3.
Enter privileged exec mode using the enable command with password ciscopress.
Step 4.
Move to global configuration mode using the configure terminal command.
Step 5.
Enter router configuration mode with a process ID of 10 by issuing the router ospf 10
command.
Step 6.
Plan for two OSPF network commands. In the first, match R4’s S0/0/0.1 subinterface,
placing it into area 0. Use a wildcard mask that matches all addresses in that subinter-
face’s subnet. Plan a second network command to match R4’s Fa0/0 interface, again
with a wildcard mask that matches all addresses in Fa0/0’s subnet, putting Fa0/0 in area
0. Record the two commands you plan to use here.
Step 7.
Configure the two OSPF network commands planned in the previous step.
Step 8.
Exit back into enable mode by entering the end command.
Step 9.
Display neighbor status on R4 using the show ip ospf neighbor command. What is the
router ID of each neighbor? What is the interface IP address?
Step 10.
View the IP routing table by issuing the show ip route command. How many inter-area
routes exist? How many intra-area routes?
Hints and Answers
Table 1 provides hints and tips for any lab steps that do not supply complete details and provides
answers for any lab steps that ask questions.
page 2
© 2009 Pearson Education, Inc. All rights reserved. This publication is protected by copyright.

Table 1
Hints and Answers
Step
Hint or Answer
2
S0/0/0.1 – 10.104.1.2 /28
Fa0/0 – 10.4.1.1 /27
6
To find the wildcard mask for S0/0/0.1, subtract the subnet mask (255.255.255.240) from
255.255.255.255, giving 0.0.0.15. The address field in this first network command should also
be the subnet number, which is 10.104.1.0. For the second command, subtract the subnet mask
(255.255.255.224) from 255.255.255.255, giving a wildcard mask of 0.0.0.31. Use R4’s Fa0/0
subnet number of 10.4.1.0. As a result, the two commands you should plan are:
network 10.104.1.0 0.0.0.15 area 0
network 10.4.1.0 0.0.0.31 area 0
9
R4 lists a single neighbor: 1.1.1.1. The output also notes that this neighbor’s interface IP address
is 10.104.1.1, which, according to Figure 1, is R1. As it turns out, R1 has been configured with
an IP address of 1.1.1.1 on its loopback 0 interface.
10
R4 sees 6 OSPF-learned routes, all of which are listed with an O on the left side of the com-
mand output. These routes are intra-area routes. In this lab’s initial configurations, all interfaces
on R1, R2, and R3 were placed into area 0.
Configuration Steps
Example 1 shows a sample of the lab exercise being completed on R4’s CLI.
Example 1
Example of Performing This Lab
R4#configure terminal
R4(config)#router ospf 10
R4(config-router)#network 10.4.1.0 0.0.0.31 area 0
R4(config-router)#network 10.104.1.0 0.0.0.15 area 0
R4(config-router)#end
R4#
page 3
© 2009 Pearson Education, Inc. All rights reserved. This publication is protected by copyright.

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