Serial connections keep flapping after IOS upgrade

[penguinroundup]

Hi,

Last night I upgraded my IOS on my 2821 router to a later train that will support MPLS networks (which we are migrating to in the near future). This morning, two of my 3 serial interfaces have started flapping up & down. Here's an excerpt from my syslog server:

07-12-2005 09:51:34 Local7.Notice 192.168.14.10 70: *Jul 12 14:44:25.789 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/0:0, changed state to up
07-12-2005 09:51:31 Local7.Error 192.168.14.10 69: *Jul 12 14:44:22.789 UTC: %LINK-3-UPDOWN: Interface Serial0/1/0:0, changed state to up
07-12-2005 09:51:29 Local7.Notice 192.168.14.10 68: *Jul 12 14:44:20.789 UTC: %CONTROLLER-5-UPDOWN: Controller T1 0/1/0, changed state to up
07-12-2005 09:46:12 Local7.Notice 192.168.14.10 67: *Jul 12 14:39:03.997 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/0:0, changed state to down
07-12-2005 09:46:12 Local7.Error 192.168.14.10 66: *Jul 12 14:39:02.997 UTC: %LINK-3-UPDOWN: Interface Serial0/1/0:0, changed state to down
07-12-2005 09:46:10 Local7.Notice 192.168.14.10 65: *Jul 12 14:39:00.997 UTC: %CONTROLLER-5-UPDOWN: Controller T1 0/1/0, changed state to down (10 SES)
07-12-2005 09:29:49 Local7.Notice 192.168.14.10 64: *Jul 12 14:22:40.665 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/0:0, changed state to up
07-12-2005 09:29:46 Local7.Error 192.168.14.10 63: *Jul 12 14:22:37.665 UTC: %LINK-3-UPDOWN: Interface Serial0/1/0:0, changed state to up
07-12-2005 09:29:44 Local7.Notice 192.168.14.10 62: *Jul 12 14:22:35.665 UTC: %CONTROLLER-5-UPDOWN: Controller T1 0/1/0, changed state to up
07-12-2005 09:29:41 Local7.Notice 192.168.14.10 61: *Jul 12 14:22:33.625 UTC: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial0/1/0:0, changed state to down
07-12-2005 09:29:41 Local7.Error 192.168.14.10 60: *Jul 12 14:22:32.625 UTC: %LINK-3-UPDOWN: Interface Serial0/1/0:0, changed state to down
07-12-2005 09:29:39 Local7.Notice 192.168.14.10 59: *Jul 12 14:22:30.625 UTC: %CONTROLLER-5-UPDOWN: Controller T1 0/1/0, changed state to down (LOF detected)

This IOS was provided to me by Cisco TAC support, and I double-checked it myself, so I know it's a valid image for my router. I am working w/ Cisco tech support on this, and so far he hasn't found anything suspicious.

I ran a hardware loopback test on my free serial interface, and it didn't do so hot, only about 80% of the pings got a reply. I am going to test my other interfaces after hours.

What the he!! is going on with this thing??? About 2 weeks ago, I tried upgrading the IOS to a different image (again, provided by Cisco tech support), and the exact same thing happened. We wound up plugging in our old 2610 router in a panic because the ports were flapping up & down constantly. I also had our ISP test our circuits, and they came back OK.

Sorry this is such a long post, but this is really aggravating!! Something really strange is going on here. TIA for any advice/suggestions!!!

 

[jneiberger]

What image were you on before the upgrade? What image did you upgrade to? And finally, which image did TAC give you to test?

What modules do you have installed?

 

[techmk]

Make sure that there is no Clocking source selected also that the line is not set for trunking , Check with you Supplier on who is the clocking end

 

[penguinroundup]

It was on the IPBASE image that the router shipped with(c2800-nm-ipbase-mz.123-8.t5.bin) , and I upgraded it to c2800nm-entservicesk9-mz.123-14.t2.bin. I have 2 2-port VWIC modules installed (so 4 ports altogether, but we are only using 3). I am pasting a copy of the configs for the 2 ports that are giving me fits:

interface Serial0/0/0:0
description connection to ABCco
bandwidth 1536
ip address x.x.6.18 255.255.255.252
ip broadcast-address x.x.6.19
no fair-queue

interface Serial0/1/0:0
no ip address
encapsulation frame-relay IETF
no ip route-cache cef
no ip route-cache
!
interface Serial0/1/0:0.1 point-to-point
description connected to LVL Office
ip address 10.10.10.6 255.255.255.252
no ip route-cache
frame-relay interface-dlci 100
!
interface Serial0/1/0:0.2 point-to-point
description connected to JC - DLCI MUST BE CHANGED PRIOR TO NO SHUT
ip address 10.10.10.14 255.255.255.252
no ip route-cache
shutdown
frame-relay interface-dlci 105

I am going to try replacing one of the cards this afternoon during lunch, that will help me determine if it's a hardware issue or something on the line.