Back to Back Routers: Setting up Frame Relay

[rburke]

Hello everyone,

Ok, well what I have is 2 CiscoPro 2501 routers that I want to setup a back to back Frame Relay WAN link. I just upgraded one of the routers IOS to 12.0.6, but the other was a different revision of the processor and won't upgrade, so it is using IOS 11.1. The problem is that I had both of these using the back to back Frame Relay through a DCE-DTE back to back Serial cord before the upgrade. Now, I set everytrhing up as it was before, I think, but it isn't working. I'm at work and don't have access to the routers now, but I'll post their config asap. If anyone has any ideas before then I'd appreciate it. Do both routers need to be running the same IOS for it to work??

burke

 

[rburke]

Ok, I finally got time to get some snapshots from my routers, which hopefully ya'll can help me fix. I'm using a back-to-back DB60(DCE) - D60(DTE) 3 ft cable. Both routers are CiscoPro 2501.

Overview:

Router A(IOS 12.0.6) -------------Router B(IOS 11.1.5)
(DCE) (DTE)
(S0)192.168.1.1 (S1)192.168.1.2


Router A (sh run):

Current configuration:
!
version 12.0
service timestamps debug uptime
service timestamps log uptime
no service password-encryption
!
hostname Router
!
!
ip subnet-zero
frame-relay switching
!
!
!
interface Ethernet0
no ip address
no ip directed-broadcast
shutdown
!
interface Serial0
no ip address
no ip directed-broadcast
encapsulation frame-relay
no ip mroute-cache
clockrate 1000000
frame-relay intf-type dce
!
interface Serial0.1 point-to-point
ip address 192.168.1.1 255.255.255.0
no ip directed-broadcast
frame-relay interface-dlci 16 CISCO
!
interface Serial1
no ip address
no ip directed-broadcast
shutdown
!
ip classless
!
!
line con 0
transport input none
line aux 0
line vty 0 4
!
end

(SH FRAME PVC)

PVC Statistics for interface Serial0 (Frame Relay DCE)

DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = INACTIVE, INTERFACE = Serial0.1

input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
out bcast pkts 0 out bcast bytes 0
pvc create time 00:10:00, last time pvc status changed 00:10:00


(SHOW FRAME LMI)

LMI Statistics for interface Serial0 (Frame Relay DCE) LMI TYPE = CISCO
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Rcvd 0 Num Status msgs Sent 0
Num Update Status Sent 0 Num St Enq. Timeouts 59




Router B (sh run):

Current configuration:
!
version 11.1
service slave-log
service udp-small-servers
service tcp-small-servers
!
hostname Router
!
!
!
interface Ethernet0
no ip address
shutdown
!
interface Serial0
no ip address
shutdown
no fair-queue
!
interface Serial1
no ip address
encapsulation frame-relay
!
interface Serial1.1 point-to-point
ip address 192.168.1.2 255.255.255.0
frame-relay interface-dlci 16 CISCO
!
no ip classless
!
line con 0
line aux 0
line vty 0 4
login
!
end

(SH FRAME PVC)
PVC Statistics for interface Serial1 (Frame Relay DTE)

DLCI = 16, DLCI USAGE = LOCAL, PVC STATUS = INACTIVE, INTERFACE = Serial1.1

input pkts 0 output pkts 0 in bytes 0
out bytes 0 dropped pkts 0 in FECN pkts 0
in BECN pkts 0 out FECN pkts 0 out BECN pkts 0
in DE pkts 0 out DE pkts 0
pvc create time 00:01:37, last time pvc status changed 00:01:37

(SH FRAME LMI)

LMI Statistics for interface Serial1 (Frame Relay DTE) LMI TYPE = CISCO
Invalid Unnumbered info 0 Invalid Prot Disc 0
Invalid dummy Call Ref 0 Invalid Msg Type 0
Invalid Status Message 0 Invalid Lock Shift 0
Invalid Information ID 0 Invalid Report IE Len 0
Invalid Report Request 0 Invalid Keep IE Len 0
Num Status Enq. Sent 72 Num Status msgs Rcvd 0
Num Update Status Rcvd 0 Num Status Timeouts 71



If someone could take a look at this and help me out hten I'd appreciate it. I erased my config prior to loading these settings, so everything is pretty much clean slate. The wierd thing is that I can make it work if I switch the routers and Router A is DTE and Router B is DCE, so I know the cable works. Please help me figure this out.

burke

 

[rburke]

If someone could help me I'd REALLY appreciate it.

Thanks,
burke

 

[svermill]

burke,

You need to check this out:

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

Notice that the most basic frame encapsulated config does not make use of LMI. Follow the link to hybrid switching if that is necessary for what you are trying to accomplish. I suspect that it is since you have 'frame-relay switching' enabled on routera. Notice that you need frame relay map statements in such a scenario.

 

[minhquan]

bruke,
Give us the result after that you do:
First, use no keepalive to disables the LMI mechanism for serial lines using FR encapsulation.
Second, show frame-relay pvc, you'll see PVC STATUS = STATIC.
OK, tell me if it's still not working.
Regard.
My mail add: nguyenminhquan@hotmail.com

 

[letanhien]

your problem is dlci. you have a same dlci at both router, it need to change to show dlci of distance end router.

 

[minhquan]

I can't understand? i had setup 2 router Cisco 2500 similar to the rburke's config, anh then, it work properly. It isn't any fault.

 

[kleta]

The only thing that I see, that is different from my setup that works is frame-relay intf-type is no set to DTE on the DTE side.

I hope it helps.

Kurt

 

[rsivanandan]

Hi,

Looks like a bit of confusion. Just to have a frame connection without LMI, all that is needed is as below on both sides (change the ip addresses) and take out the frame-relay switching and frame-relay intf-type commands, that is for LMI;

interface Serial1
no ip address
encapsulation frame-relay
no keepalive
!
interface Serial1.1 point-to-point
ip address 192.168.1.2 255.255.255.0
frame-relay interface-dlci 16 CISCO