Mpls : Simple Mpls Implementation Using Juniper Two Routers/Switches (L3)

Configuration on Router R3

R3>enable

R3#conf term

R3(config)#int loopback 0

R3(config-if)#ip address 172.16.3.1 255.255.0.0

R3(config-if)#no shutdown

R3(config-if)#exit

R3(config)#int fastethernet 0/0

R3(config-if)#ip address 172.16.23.3 255.255.0.0

R3(config-if)#no shutdown

R3(config-if)#exit

R3(config)#router eigrp 1

R3(config-router)#no auto-summary

R3(config-router)#network 172.16.0.0

R3(config-route)#exit

R3(config)#interface fastethernet 0/0

R3(config-if)#mpls ip

When everything is configured ping from R1 to R3

R1#ping 172.16.3.1

Verify

R1#show ip route

Verify MPLS configuration

b. Using Juniper routers

For MPLS to be activated, it is necessary to add the MPLS protocol family to the interfaces that will bear MPLS traffic.

Interface activation: The MPLS family requires to be activated on all the interfaces using MPLS traffic. Enter the [edit interfaces] mode to start configuring MPLS.

user@juniper>edit
user@juniper#edit interfaces

[edit interfaces]

user@juniper#set ge-0/0/0 unit 0 family mpls

[edit interfaces]

user@juniper# set fe-0/0/1 unit 0 family mpls
 
user@juniper# show

     fe-0/0/1 {

         unit 0 {

             family inet {

                 address 192.168.0.1/24;

             }

             family mpls;

         }

     }

     ge-0/0/0 {

         unit 0 {

             family inet {

                 address 192.168.1.1/24;

             }

             family mpls;

         }

     }

Protocol activation: Before MPLS can be implemented in a network it must be explicitly be enabled under the [edit protocols] section.

[edit]

 user@juniper# edit protocols

 [edit protocols]

 user@juniper# set mpls interface all 

 [edit protocols]

 user@juniper# show

     mpls {

         interfaces all;

     } 

 [edit protocols]

 user@juniper#commit

To allow neighbor discovery LDP need to be enabled on interface under [edit protocols].