Frame relay

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  • Publicado : 2 de julio de 2010
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PT: Configuring Frame Relay

Objectives

• View the default internetwork configuration.
• Configure Frame Relay connectivity.
• Configure Static and Default routing.
• Verify connectivity.

Background/Scenario

Four routers must be interconnected in a hub-and-spoke Frame Relay configuration. Router R1 is the hub, and routers R2, R3, and R4 are spoke routers. The FrameRelay connections will be established using Frame Relay point-to-point connections over subinterfaces from R1 to each spoke router. Routing will be established using static routes on the hub router and default routes on all spoke routers. The frame relay switch(es) have already been configured within the cloud.

Remote administrative access is established using SSH with the username admin andpassword cisco.

Task 1: Configure Frame Relay and Static Routing on the Hub Router (R1).

Step 1. Verify Default Configurations.

a. On all four routers, enter privileged EXEC mode with the password cisco.

b. From privileged EXEC mode on all four routers, issue the show running-config command to verify running configurations.

Note: All routers have been preconfigured with hostnames,enable password, and SSH connectivity. All LAN interfaces have also been configured with IP addresses and are currently active.

c. Use the show ip route command to verify routing tables.

Step 2. Configure the Physical Frame Relay Interface on R1.

When configuring frame-relay subinterfaces, the main physical interface must be enabled for Frame Relay connectivity; therefore, configure FrameRelay on the serial 0/0/0 interface of router R1. The Frame Relay LMI type is autosensed and will not be manually configured.

a. From privileged EXEC mode on R1, enter global configuration mode.

d. Enter the following commands on R1 to enable Frame Relay on the physical interface.

R1(config)# interface serial0/0/0
R1(config-if)# encapsulation frame-relayR1(config-if)# no shutdown

Step 3. Configure the Subinterfaces on R1.

Frame Relay subinterfaces will be configured using point-to-point Frame Relay. Configure the point-to-point connections to the three spoke routers via subinterfaces and assign the appropriate dlci number to each frame relay connection, see the table below:

|S0/0/0.102 |IP: 10.0.1.1|DLCI: 102 |
| |SM: 255.255.255.252 | |
|S0/0/0.103 |IP: 10.0.1.5 |DLCI: 103 |
| |SM: 255.255.255.252 ||
|S0/0/0.104 |IP: 10.0.1.9 |DLCI: 104 |
| |SM: 255.255.255.252 | |

a. Create and configure subinterface s0/0/0.102. From global configuration mode, enter the following commands:R1(config)# interface Serial0/0/0.102 point-to-point
R1(config-subif)# ip address 10.0.1.1 255.255.255.252
R1(config-subif)# frame-relay interface-dlci 102
R1(config-subif)# exit

e. Repeat the above steps to create and configure subinterface s0/0/0.103 and s0/0/0.104.

R1(config)# interface Serial0/0/0.103 point-to-pointR1(config-subif)# ip address 10.0.1.5 255.255.255.252
R1(config-subif)# frame-relay interface-dlci 103
R1(config-subif)# exit
R1(config)# interface Serial0/0/0.104 point-to-point
R1(config-subif)# ip address 10.0.1.9 255.255.255.252
R1(config-subif)# frame-relay interface-dlci 104
R1(config-subif)# exit

Step 4. Configure Static Routing...
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