Frame Relay Point-to-Point Config?????

mehdi.saghaei

Hello, Is there anyone who can help me about configuring the Point-to-Point Frame Relay?

I have two 2501 Routers with (one of the has 12.1 IOS version and another has 12.0 IOS) ,which are connected to each other via Serial 0 Interfaces, as the following:

R1

Interface Serial 0
Encapsulation Frame-Relay
no shutdown
no keepalive

Interface serial 0.1 point-to-point
ip address 10.0.0.1 255.0.0.0
Frame-relay interface-dlci 100
no shutdown



R2

Interface serial 0
Encapsulation Frame-Relay
Frame-Relay intf-type DCE
no shutdown
no keepalive

Interface serial 0.1 point-to-point
ip address 10.0.0.2 255.0.0.0
Frame-Relay interface-dlci 101
no shutdown

After configuration the result of Show frame-relay PVC shows the PVC status is: STATIC and result of the Show frame-relay MAP command, shows the Interface ser 0.1 point-to-point is UP and broadcast. Also both of the interfaces (Serial 0 and Serial 0.1 point-to-point) on each router are UP.
The problem is, I can not ping from R1 to R2 or Conversely.

Can you help me?

mysql1988

You need a frame-relay switch before the configuration is going to work.

You cannot configure a frame-relay over back-to-back serial connections

dtlokee

You can do a back to back configuration if you turn off keepalives, it's not a realistic way to configure frame-relay, but it would allow you to configure a DLCI between the two routers and have the PVC's come up. The best way is to get a router like a 2520 that has 4 serial ports that you can use for your frame relay switch.

benbuiltpc

To answer your question, you need a clock rate on the DCE side, and the DLCIs must match, according to this:


http://www.cisco.com/warp/public/125/frbacktoback.html


I tried it in Packet Tracer and got it working.

shamir_79

Hi,

The R2 configuration should be

#int serial 0
#encapsulation frame-relay
#int serial 0.2 point-to-point
#ip address 10.0.0.2 255.0.0.0
#Frame-Relay interface-dlci 101
#no shutdown

Check for the DCE side cable and according to that define the "Clock Rate" on the Router.
Check you Frame-Relay switch also.

Troubleshoot it.

Regards,
Shamir

mehdi.saghaei wrote: »

Hello, Is there anyone who can help me about configuring the Point-to-Point Frame Relay?

I have two 2501 Routers with (one of the has 12.1 IOS version and another has 12.0 IOS) ,which are connected to each other via Serial 0 Interfaces, as the following:

R1

Interface Serial 0
Encapsulation Frame-Relay
no shutdown
no keepalive

Interface serial 0.1 point-to-point
ip address 10.0.0.1 255.0.0.0
Frame-relay interface-dlci 100
no shutdown



R2

Interface serial 0
Encapsulation Frame-Relay
Frame-Relay intf-type DCE
no shutdown
no keepalive

Interface serial 0.1 point-to-point
ip address 10.0.0.2 255.0.0.0
Frame-Relay interface-dlci 101
no shutdown

After configuration the result of Show frame-relay PVC shows the PVC status is: STATIC and result of the Show frame-relay MAP command, shows the Interface ser 0.1 point-to-point is UP and broadcast. Also both of the interfaces (Serial 0 and Serial 0.1 point-to-point) on each router are UP.
The problem is, I can not ping from R1 to R2 or Conversely.

Can you help me?

summer08

hi i just have a simple problem about frame relay point to point
(btw im using packet tracer 5.2)
im doing this topology w/c includes 3 routers (2811 router) connected to a frame relay
i was given a network address of 10.30.20.16/28 in the frame relay
my DLCI's are
102 = R1 to R3
301 = R3 to R1
and
202 = R2 to R3
302 = R3 to R2
so 102 will be configured in R1, 202 in R2, 301 and 302 in R3
so when i configured frame relay point to point per subinterface,
I used /28 for the subnet mask
i didnt had any problems with R1 and R2
in R3, I configured s0/0/1.301 with a subnet of /28
but when i tried doing this in s0/0/1.302 here's what i got

R3(config)#int s0/0/1.302 point-to-point
R3(config-subif)#ip add 10.30.20.20 255.255.255.240
% 10.30.20.16 overlaps with Serial0/0/1.301

so what does this mean?
someone told me to use /30 for the subnet mask
so i got this

R3(config-subif)#ip add 10.30.20.20 255.255.255.252
Bad mask /30 for address 10.30.20.20

so what subnet mask should i use?
i know its just an easy problem for some but i'm just a beginner so i'm not good in troubleshooting yet
anyway thanks in advance to whoever's gonna answer my question

Xenz

I'm trying to decipher your post but

10.30.20.16/28
10.30.20.17 - 10.30.20.30

does the other address overlap in this range?

10.30.20.20/30
10.30.20.21 - 10.30.20.22

You can't use the network address 10.30.20.20. You should really go back to review on subnetting.

summer08

here's my ip addresses

network address given in the frame relay switch is 10.30.20.16/25

in R1, s0/0/1.102 = 10.30.20.17/28
in R2, s0/0/1.202 = 10.30.20.18/28
in R3, s0/0/1.301 = 10.30.20.19/28
s0/0/1.302 = 10.30.20.20/28

im only having problems with 302 b/c once I configure 301 with /28 subnet mask then 302 will give me the message

R3(config)#int s0/0/1.302 point-to-point
R3(config-subif)#ip add 10.30.20.20 255.255.255.240
% 10.30.20.16 overlaps with Serial0/0/1.301

i was told to split the subnet mask and use /30
but im just confused on where to use /30...

Xenz

You would use a /30 mask on the Point to Point links. You would need a full/partial mesh to use your addressing scheme. That is, you're using 2 P2P links which means you need 2 different subnets. If you had a mesh topology going, you could use IP's in the same subnet.

See my example I gave before regarding address ranges.

/28

network - broadcast
10.30.20.0 - 10.30.20.15
10.30.20.16 - 10.30.20.31

/30

network - broadcast
10.30.20.0 - 10.30.20.3
10.30.20.4 - 10.30.20.7
10.30.20.8 - 10.30.20.11
10.30.20.12 - 10.30.20.15
10.30.20.16 - 10.30.20.19
10.30.20.20 - 10.30.20.23

You need to go back to subnetting before you start tackling frame-relay.