Frame Relay - basic question

[joeadiutori]

Hi All,

I have 2 routers back-to-back in my lab.  I'm trying to configure Frame Relay.  For now I'm just trying to ping from 12.1 to 12.2 but it's not working.  The serial interfaces on both routers are up and up.  And prior to implementting Frame Relay my pings were successful. 

Any ideas???

ROUTER 1:

interface Serial1

ip address 192.168.12.1 255.255.255.0

ip nat inside

encapsulation frame-relay

no keepalive

frame-relay map ip  192.168.12.2  63

ROUTER 2:

interface Serial0
ip address 192.168.12.2  255.255.255.0
no ip directed-broadcast
encapsulation frame-relay
no keepalive
clockrate 56000
frame-relay map ip  192.168.12.1  65

[acampbell · Accepted solution]

Hi,

One of your routers needs to be a frame relay DCE the other DTE (default)

As router 2 is the DCE end of the back to back we will make it the DCE for frame relay too.

ROUTER 2:

!

interface Serial0

frame-relay intf-type dce

!

As this is point to point with no frame relay switch cloud in the middle we need to use the same DLCI at both ends

ROUTER 1:

interface Serial1

ip address 192.168.12.1 255.255.255.0

ip nat inside

encapsulation frame-relay

no keepalive

frame-relay map ip 192.168.12.2 101 broadcast

bandwidth 56

ROUTER 2:

interface Serial0
ip address 192.168.12.2 255.255.255.0
no ip directed-broadcast
encapsulation frame-relay
no keepalive
clockrate 56000

frame-relay intf-type dce
frame-relay map ip 192.168.12.1 101 broadcast

bandwidth 56

!

Hopefully now it will work

show frame pvc

show frame lmi

you should see that the DLCI is active in both routers

yoiu should see LMI stats incrementing

Ping accroos the network

HTH

Alex

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[joeadiutori]

It's working now.  12.1 can ping 12.2.  The only thing I changed was the DLCI.

ROUTER 1:

interface Serial1

ip address  192.168.12.1  255.255.255.0

ip nat inside

encapsulation frame-relay

no keepalive

frame-relay map ip  192.168.12.2  101  broadcast

ROUTER 2:

interface Serial0
ip address  192.168.12.2  255.255.255.0
no ip directed-broadcast
encapsulation frame-relay
no keepalive
clockrate 56000
frame-relay map ip  192.168.12.1  101  broadcast

[Reza Sharifi]

You need to clock the site that is DCE.  If you do a "sh contr inter s0" and s1, it will tell you which side is DCE.

in your case you clock r2.  Is this the DCE site?

HTH

[joeadiutori]

ACCMPBELL - I will now implement the suggestions and let you know

REZA - I think clocking is OK.  At least prior to configuring Frame Relay everything was working fine.  I also configured PPP and that worked fine.  HDLC works fine.  This tells me the clocking is working.  Do you agree? 

[Kishore Chennupati]

I have 2 routers back-to-back in my lab.  I'm trying to configure Frame Relay.  For now I'm just trying to ping from 12.1 to 12.2 but it's not working.  The serial interfaces on both routers are up and up.  And prior to implementting Frame Relay my pings were successful.  
Any ideas???
ROUTER 1:
interface Serial1
ip address 192.168.12.1 255.255.255.0
ip nat inside
encapsulation frame-relay
no keepalive
frame-relay map ip  192.168.12.2  63
ROUTER 2:
interface Serial0
ip address 192.168.12.2  255.255.255.0
no ip directed-broadcast
encapsulation frame-relay
no keepalive
clockrate 56000
frame-relay map ip  192.168.12.1  65

What is the ip nat inside doing? Maybe remove it and try

HTH

Kishore