How to configure Frame Realy

Configuring Frame Relay involves the following steps:

Change the encapsulation

Go in interface mode and select the Frame Relay encapsulation on the interface. There are two types of Frame Relay encapsulations: Cisco and IETF. Cisco is the default. Syntax to set your encapsulation is

 encapsulation frame-relay [ietf]

Configure LMI type

The three LMI types are Cisco, Ansi, and Q933a. For IOS 11.2 and higher, the LMI type is automatically detected

 frame-relay lmi-type [cisco | ansi | 933a]

Configure Frame Relay map

configuring a static Frame Relay map, is optional unless you are using subinterfaces. The Frame Relay map will map a Layer 3 address to a local DLCI. This step is optional because inverse-arp will automatically perform this map for you. The syntax for a Frame Relay map is as follows:

frame-relay map protocol address dlci [broadcast] [cisco | ietf]

Configure subinterfaces

If you are using a routing protocol in a hub-and-spoke topology, you will probably want to use subinterfaces to avoid the split-horizon problem. To configure a subinterface, remove the IP address off the main interface and put it under the subinterface. Configuring a subinterface involves assigning it a number and specifying the type. The following command creates point-to-point subinterface serial0/0.1

 Router(config)#interface serial0/0.1 point-to-point

To create a multipoint subinterface, enter multipoint instead:

 Router(config)#interface serial0/0.1 multipoint

Assign IP address to subinterface

After entering one of these commands you will be taken to the subinterface configuration mode where you can enter your IP address:

Router(config-subif)#ip address 10.0.0.2 255.0.0.0

If you are using a multipoint subinterface, you will need to configure frame-relay maps and you cannot rely on inverse-arp.

If you are using a point-to-point subinterface, you will need to assign a DLCI to the subinterface. This is only for point-to-point subinterfaces; this is not needed on the main interface or on multipoint subinterfaces. To assign a DLCI to a point-to-point subinterface, enter the following command under the subinterface:

 frame-relay interface-dlci dlci

Configuration of Frame Relay

Lets practically implement whatever you learn so far. Download this pre configured topology and load it in packet tracer.

Download topology for packet tracer

Now first configure R1. Fast Ethernet port and hostname is already configured. Double click on R1 and configure serial port for frame relay encapsulation and further create sub interface for connecting R2, R3, R4. Configure also static route for connecting remaining network.

Configure R1

R1>enable

R1#configure terminal

R1(config)#interface serial 0/0/0

R1(config-if)#encapsulation frame-relay

R1(config-if)#no shutdown

R1(config-if)#exit

R1(config-subif)#interface serial 0/0/0.102 point-to-point

R1(config-subif)#ip address 192.168.1.245 255.255.255.252

R1(config-subif)#frame-relay interface-dlci 102

R1(config-subif)#exit

R1(config)#interface serial 0/0/0.103 point-to-point

R1(config-subif)#ip address 192.168.1.249 255.255.255.252

R1(config-subif)#frame-relay interface-dlci 103

R1(config-subif)#exit

R1(config)#interface serial 0/0/0.104 point-to-point

R1(config-subif)#ip address 192.168.1.253 255.255.255.252

R1(config-subif)#frame-relay interface-dlci 104

R1(config-subif)#exit

R1(config)#ip route 192.168.1.64 255.255.255.224 192.168.1.246

R1(config)#ip route 192.168.1.96 255.255.255.224 192.168.1.250

R1(config)#ip route 192.168.1.128 255.255.255.224 192.168.1.254

R1(config)#exit

configure R2

R2>enable

R2#configure terminal

R2(config)#interface serial 0/0/0

R2(config-if)#encapsulation frame-relay

R2(config-if)#no shutdown

R2(config-if)#exit

R2(config)#interface serial 0/0/0.101 point-to-point

R2(config-subif)#ip address 192.168.1.246 255.255.255.252

R2(config-subif)#frame-relay interface-dlci 101

R2(config-subif)#exit

R2(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.245

configure R3

R3>enable

R3#configure terminal

R3(config)#interface serial 0/0/0

R3(config-if)#encapsulation frame-relay

R3(config-if)#no shutdown

R3(config-if)#exit

R3(config)#interface serial 0/0/0.101 point-to-point

R3(config-subif)#ip address 192.168.1.250 255.255.255.252

R3(config-subif)#frame-relay interface-dlci 101

R3(config-subif)#exit

R3(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.249

R3(config)#

configure R4

R4>enable

R4#configure terminal

R4(config)#interface serial 0/0/0

R4(config-if)#encapsulation frame-relay

R4(config-if)#no shutdown

R4(config-if)#exit

R4(config)#interface serial 0/0/0.101 point-to-point

R4(config-subif)#ip address 192.168.1.254 255.255.255.252

R4(config-subif)#frame-relay interface-dlci 101

R4(config-subif)#exit

R4(config)#ip route 0.0.0.0 0.0.0.0 192.168.1.253

R4(config)#

now verify by doing ping from pc0 to all pc. It should be ping successfully. I have uploaded a configured topology but use it as the final resort first try yourself to configure it.

Donload Configured Frame Relay

Router(config)#interface serial 0/0/0	Enter in interface mode
Router(config-if)#encapsulation frame-relay	Turns on Frame Relay encapsulation with the default encapsulation type of cisco
Router(config-if)#frame-relay lmitype {ansi | cisco | q933a}	Depending on the option you select, this command sets the LMI type to the ANSI standard, the Cisco standard, or the ITU-T Q.933 Annex A standard.
Router(config-if)#frame-relay interface-dlci 110	Sets the DLCI number of 110 on the local interface and enters Frame Relay DLCI configuration mode
Router(config-fr-dlci)#exit	Returns to interface configuration mode
Router(config-if)#frame-relay map ip 192.168.100.1 110 broadcast	Maps the remote IP address (192.168.100.1) to the local DLCI number (110). The optional broadcast keyword specifies that broadcasts across IP should be forwarded to this address. This is necessary when using dynamic routing protocols.
Router(config-if)#no frame-relay inverse arp	Turns off Inverse ARP.
Router#show frame-relay map	Displays IP/DLCI map entries
Router#show frame-relay pvc	Displays the status of all PVCs configured
Router#show frame-relay lmi	Displays LMI statistics
Router#clear frame-relay counters	Clears and resets all Frame Relay counters
Router#clear frame-relay inarp	Clears all Inverse ARP entries from the map table
Router#debug frame-relay lmi	Used to help determine whether a router and Frame Relay switch are exchanging LMI packets properly