frame relay switch question

hankooknara

while doing the lab, I see the below frame-relay switch config.

Can someone tell me how to interpret the frame-relay route section?

thank you.



interface Serial0/5
description Connection to NMR1 S0/0
no ip address
encapsulation frame-relay
clock rate 72000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 102 interface Serial0/6 201
frame-relay route 103 interface Serial0/0 301
frame-relay route 104 interface Serial1/0 401
!

EdTheLad

hankooknara wrote:

while doing the lab, I see the below frame-relay switch config.

Can someone tell me how to interpret the frame-relay route section?

thank you.



interface Serial0/5
description Connection to NMR1 S0/0
no ip address
encapsulation frame-relay
clock rate 72000
frame-relay lmi-type ansi
frame-relay intf-type dce
frame-relay route 102 interface Serial0/6 201
frame-relay route 103 interface Serial0/0 301
frame-relay route 104 interface Serial1/0 401
!

Frame-relay uses dlcis at the datalink layer to address frames, ethernet uses the mac address.On your router port you will have a destination ip address mapped to a frame-relay dlci.Which means if you ping the destination address all the data will be sent in frames with the dlci bit marked as configured in the router.These frames will arrive at the frame-relay switch and if configured as your example above, they arrive on serial port 0/5 with dlci 102 they will get switched to serial port 0/6 and the dlci in the frame will be changed to 201.The receiving router should be configured with a dlci 201 to receive the frames.