10-26-2010 11:38 AM - edited 03-04-2019 10:16 AM
Dear All,
I have configured a cisco router to work as a Frame Relay switch. I have two serial ports connected to 2 routers.
I find these serial interface on my routers going up and down. Below are my config
FR
================
!
interface Serial0/0
no ip address
encapsulation frame-relay
clock rate 64000
frame-relay intf-type dce
frame-relay route 102 interface Serial0/1 201
!
interface Serial0/1
no ip address
encapsulation frame-relay
clock rate 64000
frame-relay intf-type dce
frame-relay route 201 interface Serial0/0 102
=======================
R1
=========================
interface Serial0/0
no ip address
encapsulation frame-relay
!
interface Serial0/0.1 multipoint
ip address 192.168.1.1 255.255.255.0
frame-relay map ip 192.168.1.2 102 broadcast
!
router ospf 10
router-id 1.1.1.1
log-adjacency-changes
network 172.16.16.0 0.0.0.255 area 0
network 192.168.1.0 0.0.0.255 area 0
neighbor 192.168.1.2
!
======================================
R2
=====================
!
interface Serial0/0
no ip address
encapsulation frame-relay
!
interface Serial0/0.2 multipoint
ip address 192.168.1.2 255.255.255.0
frame-relay map ip 192.168.1.1 201 broadcast
!
router ospf 10
log-adjacency-changes
network 10.10.10.0 0.0.0.255 area 2
network 192.168.1.0 0.0.0.255 area 0
neighbor 192.168.1.1
on FR
=============
Router#
*Mar 1 00:37:55.155: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
*Mar 1 00:38:55.231: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to up
*Mar 1 00:41:17.807: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/0, changed state to down
*Mar 1 00:41:35.275: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1, changed state to down
Any reason why it is doing so? Am I missing any config?
Solved! Go to Solution.
10-27-2010 07:15 AM
by default inverse ARP enabled on the interface and all dlcis linked to physical interface.
you didn't disable inverse arp on physical interfaces then did frame map statements on your multipoint subinterfaces so you linked the dlcis to the subinterfaces and did a static mapping altogether but you surely had a dynamic mapping for the physical interface already in place which was messing things up.
If you give the output of the show frame map, show frame pvc before you disable inv arp and after I think we should see the difference and tell exactly what happened
10-26-2010 12:02 PM
on Frame-relay switch you forgot gobal config command: frame-relay switching.
10-26-2010 12:09 PM
hi cadetalain,
I already have it in my config.
Still does not work. Please let me know if you need any further information.
Thanks in advance
Ravi
10-26-2010 12:39 PM
do a show controllers for each interface on FR and routers to be sure the clocking is on the DCE side.
10-27-2010 05:22 AM
Ravindra,
Try adding "frame-relay lmi-type ansi" under the serial interfaces of your FR switch.
HTH
10-27-2010 05:47 AM
Hi cadetalain/HTH,
Sh controllers s0/0 on FR and R1 made sure that the clock rate is working on fr switch only.
Tried LMI type ANSI....still same result :-(
Solution is tightly required and appreciated.
Thanks
Ravi
10-27-2010 06:15 AM
Try to add frame-relay interface dlci 201/102 in both of the routers (you might check sh frame-relay pvc to see which dlci is showing up). If you have only one pvc, you do not need subinterfaces I guess, but that wouldn't cause a problem.
The thing is as far as you use subinterfaces, you have to tell the router which sub if is using which PVC.
Otherwise, try running debug frame pvc/lmi.
10-27-2010 06:39 AM
Hi,
no frame-relay inverse-arp helped me in resolving the issue. I have no dynamic dlci. can anybody explain me why it resolved the issue. I appreciate you time. Thanks Ravi
10-27-2010 06:15 AM
ok so do a no frame-relay lmi ansi and let cisco lmi autosense work.
Can you post the output of the following show commands:
on your switch: sh frame route and show int serial
on your routers: sh ip int br ,sh int serial , sh frame lmi, sh frame map and sh frame pvc.
10-27-2010 06:40 AM
Hi,
no frame-relay inverse-arp helped me in resolving the issue. I have no dynamic dlci. can anybody explain me why it resolved the issue. I appreciate you time. Thanks Ravi
10-27-2010 07:15 AM
by default inverse ARP enabled on the interface and all dlcis linked to physical interface.
you didn't disable inverse arp on physical interfaces then did frame map statements on your multipoint subinterfaces so you linked the dlcis to the subinterfaces and did a static mapping altogether but you surely had a dynamic mapping for the physical interface already in place which was messing things up.
If you give the output of the show frame map, show frame pvc before you disable inv arp and after I think we should see the difference and tell exactly what happened
10-27-2010 08:43 AM
that makes sense !
let me take this further.
Thank
Ravi
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