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.

hankooknara

thank you for the explanation.

however, even though I had below configuration for router 1 and 2, it didn't work.

I coudln't ping and when I did show frame-relay map or other frame relay related commands, nothing showed up(or said frame-relay was inactive and wasn't able to ping.....
Can you see if what I could have missed..?

router1
interface Serial0/0
ip address 29.0.0.1 255.255.255.0
encapsulation frame-relay
frame-relay interface-dlci 102
frame-relay lmi-type ansi

router2
!
interface Serial0/0
ip address 29.0.0.2 255.255.255.0
encapsulation frame-relay
frame-relay interface-dlci 201
frame-relay lmi-type ansi
!

EdTheLad

Remove from both routers
frame-relay interface-dlci 201,
frame-relay interface-dlci 102,
frame-relay lmi-type ansi ( also remove from switch)
The lmi can be detected automatically along with the dlci's, so the less config you have the less you need to troubleshoot.
After you remove start a ping, it will take about a minute for the arp to update.
do "show frame-relay map" on both routers,inactive means you can see the switch but not the far router.You want to see active.If it doesnt work, copy and paste your config and outputs of "sh fr map" "sh fr pvc" etc.