Ccna routing and Switching Complete Study Guide

config t

Corp(config)# 

int Serial0/0

Corp(config-if)# 

no ip address

Corp(config-if)# 

int Serial1/1

Corp(config-if)# 

no ip address

Corp(config-if)# 

end

Corp#

 

SF# 

config t

SF(config)# 

int Serial0/0

SF(config-if)# 

no ip address

SF(config-if)# 

int Serial0/1

SF(config-if)# 

no ip address

SF(config-if)# 

end

SF#

Now we create the multilink interface on each side of the link and the MLP commands 

to enable the bundle.

Corp#

config t

Corp(config)# 

interface Multilink1

Corp(config-if)# 

ip address 10.1.1.1 255.255.255.0

Corp(config-if)# 

ppp multilink

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Chapter 21 

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  Wide Area Networks

Corp(config-if)# 

ppp multilink group 1

Corp(config-if)# 

end

 

SF#

config t

SF(config)# 

interface Multilink1

SF(config-if)# 

ip address 10.1.1.2 255.255.255.0

SF(config-if)# 

ppp multilink

SF(config-if)# 

ppp multilink group 1

SF(config-if)# 

exit

We can see that a link joins an MLP bundle only if it negotiates to use the bundle when 

a connection is established and the identification information that has been exchanged 

matches the info for an existing bundle.

When you configure the 

ppp multilink group

 command on a link, that link won’t be 

allowed to join any bundle other than the indicated group interface.

Verifying MLP

To verify that your bundle is up and running, just use the 

show ppp multilink

 and 

show 

interfaces multilink1

 commands:

Corp# 

show ppp multilink

 

Multilink1

  Bundle name: Corp

  Remote Endpoint Discriminator: [1] SF

  Local Endpoint Discriminator: [1] Corp

  Bundle up for 02:12:05, total bandwidth 4188, load 1/255

  Receive buffer limit 24000 bytes, frag timeout 1000 ms

    0/0 fragments/bytes in reassembly list

    0 lost fragments, 53 reordered

    0/0 discarded fragments/bytes, 0 lost received

    0x56E received sequence, 0x572 sent sequence

  Member links: 2 active, 0 inactive (max 255, min not set)

    Se0/1, since 01:32:05

    Se1/2, since 01:31:31

No inactive multilink interfaces

We can see that the physical interfaces, Se0/1 and Se1/1, are members of the logical 

interface bundle Multilink 1. So now we’ll verify the status of the interface Multilink1 on 

the Corp router:

Corp#