Configuring Basic Frame Relay

Frame Relay Basic Configuration

¿What is Frame Relay?

Frame Relay is a standardized wide area network technology that specifies the physical and logical link layers of digital telecommunications channels using a packet switching methodology. Originally designed for transport across Integrated Services Digital Network (ISDN) infrastructure, it may be used today in the context of many other network interfaces.

Network providers commonly implement Frame Relay for voice (VoFR) and data as an encapsulation technique, used between local area networks (LANs) over a wide area network (WAN). Each end-user gets a private line (or leased line) to a Frame Relay node. The Frame Relay network handles the transmission over a frequently-changing path transparent to all end-user extensively-used WAN protocols. It is less expensive than leased lines and that is one reason for its popularity. The extreme simplicity of configuring user equipment in a Frame Relay network offers another reason for Frame Relay's popularity.

With the advent of Ethernet over fiber optics, MPLS, VPN and dedicated broadband services such as cable modem and DSL, the end may loom for the Frame Relay protocol and encapsulation.[citation needed] However many rural areas remain lacking DSL and cable modem services. In such cases the least expensive type of non-dial-up connection remains a 64-kbit/s frame-relay line. Thus a retail chain, for instance, may use Frame Relay for connecting rural stores into their corporate WAN.

Frame Relay Basic Commands

• R1 Configuration

R1>enable

R1#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

R1(config)#interface Serial0/0.122 point-to-point

R1(config-subif)#ip address 172.18.12.1 255.255.255.252

R1(config-subif)#frame-relay interface-dlci 122

R1(config-fr-dlci)#exit

R1(config-subif)#interface Serial0/0.123 point-to-point

R1(config-subif)#ip address 172.18.13.1 255.255.255.252

R1(config-subif)#frame-relay interface-dlci 123

R1(config-subif)#end

R1#

%SYS-5-CONFIG_I: Configured from console by console

R1#

Objective 2. – On R2, create the sub-interface Serial0/0.221 and assign it the interface DLCI of 221 and the IP Address of 172.18.12.2/30

R2 con0 is now available

• R2 Configuration

R2>enable

R2#configure terminal

Enter configuration commands, one per line. End with CNTL/Z.

R2(config)#interface Serial0/0.221 point-to-point

R2(config-subif)#ip add 172.18.12.2 255.255.255.252

R2(config-subif)#frame-relay interface-dlci 221

R2(config-fr-dlci)#end

R2#

%SYS-5-CONFIG_I: Configured from console by console

R2#

Objective 3. – On R3, create the sub-interface Serial0/0.321 and assign it the

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