120 Labs for Cisco CCNA 200-125 and CCENT Exams

Lab 97: Configuring Multilink PPP (MLPPP)

Lab Objective

The objective of this lab exercise is for you to learn how to configure a Multilink PPP connection.

Lab Purpose:

MLPPP is a feature that will allow you to provide redundancy and some sort of load balancing by using two links (interfaces) and the benefits of the encapsulation protocol of PPP. As a Cisco engineer, as well as in the Cisco CCNA exam, you will be expected to know how to implement MLPPP functionality.

Certification Level:

This lab is suitable for ICND2 and CCNA certification exam preparation.

Lab Difficulty:

This lab has a difficulty rating of 7/10.

Readiness Assessment:

When you are ready for your certification exam, you should complete this lab in no more than 10 minutes.

Lab Topology:

Please use the following topology to complete this lab exercise:

Task 1:

Configure hostnames on R1 and R2 as illustrated in the topology.

Task 2:

Create a Multilink interface on R1 and R2 with the following settings:

  • Multilink group: 1
  • Encapsulation type: PPP
  • IP address: As in the diagram

Task 3:

Configure both Serial interfaces on R1 and R2 to join Multilink group 1.

Task 4:

Make sure that there is reachability between R1 and R2 via the MLPPP interface and that the interface is up and running.

Configuration and Verification

Task 1:

For reference information on configuring hostnames, please refer to earlier labs.

Task 2:

R1#conf t 
Enter configuration commands, one per line.  End with CTRL/Z. 
R1(config)#int multilink 1 
R1(config-if)#encapsulation ppp 
R1(config-if)#ppp multilink group 1 
R1(config-if)#no shutdown 
R1(config-if)#ip add 192.168.10.1 255.255.255.252 
R1(config-if)#end 

R2(config)#int multilink 1 
R2(config-if)#encapsulation ppp 
R2(config-if)#ppp multilink group 1 
R2(config-if)#no shutdown 
R2(config-if)#ip add 192.168.10.2 255.255.255.252 
R2(config-if)#end

Task 3:

R1#config t 
Enter configuration commands, one per line.  End with CTRL/Z. 
R1(config)#int serial0/0 
R1(config-if)#encapsulation ppp 
R1(config-if)#ppp multilink group 1 
R1(config-if)#no shutdown 
R1(config-if)#exit 

R1(config)#int serial0/1 
R1(config-if)#encapsulation ppp
R1(config-if)#ppp multilink group 1 
R1(config-if)#no shutdown 
R1(config-if)#exit 

R2(config)#int serial0/0 
R2(config-if)#encapsulation ppp 
R2(config-if)#ppp multilink group 1 
R2(config-if)#no shutdown 
R2(config-if)#exit 

R2(config)#int serial0/1 
R2(config-if)#encapsulation ppp 
R2(config-if)#ppp multilink group 1 
R2(config-if)#no shutdown 
R2(config-if)#exit

Task 4:

R1#sh ip int brief 
Interface   IP-Address    OK?   Method    Status     Protocol 
Serial0/0   unassigned    YES   unset     up         up       
Serial0/1   unassigned    YES   unset     up         up       
Multilink1  192.168.10.1  YES   manual    up         up 

R2#sh ip int brief 
Interface   IP-Address    OK?   Method    Status     Protocol 
Serial0/0   unassigned    YES   unset     up         up       
Serial0/1   unassigned    YES   unset     up         up       
Multilink1  192.168.10.2  YES   manual    up         up 

R1#ping 192.168.10.2 

Type escape sequence to abort. 
Sending 5, 100-byte ICMP Echos to 192.168.10.2, timeout is 2 seconds: 
!!!!! 
Success rate is 100 percent (5/5), round-trip min/avg/max = 56/67/96 ms

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