Solved: Using RIP in Framerelay switch

raja Saravanan · ‎11-30-2010

Hi,

Can we enable RIP in the router which is used as frame relay switch, please help me amend the configuration, Consider below scenario

Router A is frame-relay switch and is also connected to LAN segment 10.10.10.0/24

Router B is connnected to Router C via Router A using Frame-relay, further Router B has LAN segment 10.10.20.0/24 and Router C has got LAN segment 10.10.30.0/24

Router A S0/1 ( 192.168.10.1) is connected to Router B S0/1 ( 192.168.10.5 ).

Router A S0/2 ( 192.168.10.2) is connected to Router C S0/1 ( 192.168.10.10 ).

Router B uses PVC 100 to connect to Router C.

Router C uses PVC 200 to connect to Router B.

Router A configuration :

frame-relay switching

rip version2

network 10.10.10.0

network 192.168.10.0

int s0/1

ip address 192.168.10.1 255.255.255.240

encap frame-relay

frame-relay intf-type DCE

clock rate 64000

frame-relay route 100 int s0/2 200

int s0/2

ip address 192.168.10.2 255.255.255.240

encap frame-relay

frame-relay intf-type DCE

clock rate 64000

frame-relay route 200 int s0/1 100

Router B configuration :

rip version2

network 10.10.20.0

network 192.168.10.0

int s0/1

ip address 192.168.10.5 255.255.255.240

encap frame-relay

frame-relay map ip 192.168.10.10 100 broadcast

Router C configuration :

rip version2

network 10.10.30.0

network 192.168.10.0

int s0/1

ip address 192.168.10.5 255.255.255.240

encap frame-relay

frame-relay map ip 192.168.10.5 200 broadcast

cadet alain · ‎12-01-2010

Hi raja,

I don't think that a router can act as a frame-relay switch and frame-relay DTE device on same interface but you can use back to back DTE-DTE

frame-relay switching and it will work for sure.

Here's what you've got to do:

First on A each serial interface must be in its own subnet

you must get rid of these commands: frame-relay switching in config mode and frame-relay intf-type dce in interface mode

then you must add this command on each serial of every router: no keepalive ( to disable LMI as here we have no DCE side)

Important: the DLCI must be the same on each side of the serial connection

You'll have to replace your frame-relay interface-dlci commands by frame map ip commands

Don't forget no auto-summury in your rip statements.

Regards.

Don't forget to rate helpful posts.

View solution in original post

cadet alain · ‎12-02-2010

Hi Shaggy,

In Router A, I have configured two serial interfaces as DCE explicity

using the command " frame-relay intf-type DCE" which configuration commands imply that the interfaces will be treated as DTE.

for Frame-relay just putting the interface command encapsulation frame-relay implies it will be a DTE device as far as Frame-relay is concerned.

DLCI # are locally significant, what do you mean by " Important: the DLCI must be the same on each side of the serial connection ".

As you are not using a Frame-relay switch here and so as you enterd no keepalive command to disable LMI you have to put same DLCI on each end of the circuit.By the way DLCI can be locally or globally significant.

How the clocking happens when we configure back to back DTE connections?

The clocking has nothing to do with Frame-relay but simply which side is DCE( female serial cable) will provide clocking.

You always clock on DCE side whether you are doing HDLC, PPP or Frame-relay.

Here DTE to DTE refers to Frame-relay role of the router.

Regards.

Alain.

Don't forget to rate helpful posts.

View solution in original post

Talha Ansari · ‎12-02-2010

The port of frame-relay switch doesn't have any dlci number assigned instead it only knows the mapping of the source and destination dlci number to the respective exit port. Even if you assign an IP address on the port of a frame-relay switch the layer 2 dlci for that port is still missing. The switching of packets in frame-relay happens on the basis of dlci number.

Suppose if you assign an ip address and as well as a dlci number on the port of a frame-relay switch then that connectivity will be a point-to-point connectivity between the CE and the Frame-relay switch.... but yes in this case you can ping the port of the frame-relay switch, establish neighborships of eigrp, bgp, ospf etc with the frame-relay switch but your frame-relay switch will be actually acting as a router in this case.

Hope that helps....

View solution in original post

cadet alain · ‎12-01-2010

Hi raja,

I don't think that a router can act as a frame-relay switch and frame-relay DTE device on same interface but you can use back to back DTE-DTE

frame-relay switching and it will work for sure.

Here's what you've got to do:

First on A each serial interface must be in its own subnet

you must get rid of these commands: frame-relay switching in config mode and frame-relay intf-type dce in interface mode

then you must add this command on each serial of every router: no keepalive ( to disable LMI as here we have no DCE side)

Important: the DLCI must be the same on each side of the serial connection

You'll have to replace your frame-relay interface-dlci commands by frame map ip commands

Don't forget no auto-summury in your rip statements.

Regards.

Don't forget to rate helpful posts.

raja Saravanan · ‎12-01-2010

Hi Cadetalain,

Good day!!! Hope you are doing good, thank you very much for your support, I have few more queries,

1). In Router A, I have configured two serial interfaces as DCE explicity using the command " frame-relay intf-type DCE" which configuration commands imply that the interfaces will be treated as DTE.

2).DLCI # are locally significant, what do you mean by " Important: the DLCI must be the same on each side of the serial connection ".

3). How the clocking happens when we configure back to back DTE connections?

Please help me, I am not able to logically understand the configuration corrections recommended by you. I am trying this in a LAB environment, I need to configure one router as service provider router, that's why I need to configure a frame relay-switch.

Thanks & Regards,

Shaggy

cadet alain · ‎12-02-2010