The Journey of a Network Engineer

Nov 3 2011   9:06AM GMT

How to configure Frame-Relay Switching?



Posted by: Sulaiman Syed
Tags:
CCIE
Cisco
Configure
exam
how
Lab
map
router
switching

For some reason i thought that i have written an entry for Frame-Relay switching. But the records show none. So here it comes.

During studies of CCIE, you might need to configure a Router to act as a frame-relay switch. The configurations are very simple and straight forward. There is the old IOS way, where configurations are done on the interface command line. The new way is by using the command connect from the global

The network diagram is shown. It is simple yet enough to demonstrate the configurations for the purpose in hand.

CCIE

To configure FR switch, use the following commands.

config t

frame-relay switching

interface Serial1/2
no ip address
encapsulation frame-relay
serial restart-delay 0
clock rate 64000
frame-relay intf-type dce
exit

interface Serial1/3
no ip address
encapsulation frame-relay
serial restart-delay 0
clock rate 64000
frame-relay intf-type dce
exit

connect R1_R2 serial 1/2 132 serial 231

Or alternatively, the old IOS commands can be used.

interface Serial1/2
no ip address
encapsulation frame-relay
serial restart-delay 0
clock rate 64000
frame-relay intf-type dce
frame-relay route 132 interface Serial1/3 231
exit

interface Serial1/3
no ip address
encapsulation frame-relay
serial restart-delay 0
clock rate 64000
frame-relay intf-type dce
frame-relay route 231 interface Serial1/2 132
exit

While the configurations for R1 and R2 are straight and simple.

R1 will utilize the inverse ARP. R2 will disable inverse ARP and use static ARP mapping.

R1
conf t
interface Serial1/1
ip address 155.1.12.1 255.255.255.0
encapsulation frame-relay
serial restart-delay 0
end

R2
conf t
interface Serial1/1
ip address 155.1.12.2 255.255.255.0
encapsulation frame-relay
serial restart-delay 0
frame-relay map ip 155.1.12.1 231
no frame-relay inverse-arp
end

With this, the configurations are done. Simple yet important to be ready for CCIE lab exam.

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