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Cisco 3640, NM-4T1-IMA intermittent no connectivity issue

HELP!!! I have a customer with a Cisco 3640 router and an NM-4T1-IMA (currently 1 T-1). Every so often there connection to the WAN just dies and the router requires a reload to regain connectivity. Local routing is unaffected. This problem happens every couple of weeks, days, or may not happen for a year or more but when it does it is a very bad thing. The ISO image is c3640-ik9s-mz.123-14.t3.bin. The router has a full 128/32 flash/mem.

The log output is as follows:

2006-10-30 13:48:57 Local7.Notice 192.168.1.254 4617: Oct 30 13:41:23: %IMA-5-ACTIVE_LINK_CHANGE: IMA Group ATM3/IMA1 now has 1 active links, active link bitmap is 0x1.

2006-10-30 13:49:07 Local7.Error 192.168.1.254 4618: Oct 30 13:41:33: %LINK-3-UPDOWN: Interface ATM3/0, changed state to down

2006-10-30 13:49:07 Local7.Error 192.168.1.254 4619: Oct 30 13:41:33: %LINK-3-UPDOWN: Interface ATM3/IMA1, changed state to down

2006-10-30 13:49:07 Local7.Notice 192.168.1.254 4620: Oct 30 13:41:34: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM3/0, changed state to down

2006-10-30 13:49:08 Local7.Notice 192.168.1.254 4621: Oct 30 13:41:34: %LINEPROTO-5-UPDOWN: Line protocol on Interface ATM3/IMA1, changed state to down

The T-1 is fine. A 24 hour monitor was clean. I also happen to be the telephone company T-1 tech.

The router interface is as follows:

interface ATM3/0

description Physical Interface for 60.XXXX.XXXXX..XX - Backbone T1

no ip address

no atm ilmi-keepalive

ima-group 1

no scrambling-payload

!

interface ATM3/1

description **** NOT IN USE ****

no ip address

shutdown

no atm ilmi-keepalive

no scrambling-payload

!

interface ATM3/2

description **** NOT IN USE ****

no ip address

shutdown

no atm ilmi-keepalive

no scrambling-payload

!

interface ATM3/3

description **** NOT IN USE ****

no ip address

shutdown

no atm ilmi-keepalive

no scrambling-payload

!

interface ATM3/IMA1

description Primary Connector Interface for Sub-IF

no ip address

no atm ilmi-keepalive

!

interface ATM3/IMA1.1 point-to-point

description Connector Interface for 60.XXXX.XXXXX..XX - Backbone T1

ip address XX.XXX.XXX.XX 255.255.255.XXX

ip verify unicast reverse-path

no ip unreachables

ip accounting output-packets

ip nat outside

ip virtual-reassembly

atm pvc X 0 XXX aal5snap

Some one please help. Any suggestions would be great. Let me know if I can provide any additional information.

3 REPLIES
Silver

Re: Cisco 3640, NM-4T1-IMA intermittent no connectivity issue

Silver

Re: Cisco 3640, NM-4T1-IMA intermittent no connectivity issue

Hi Shawn ,

Can you paste the output of "" sh ima int atm3/ima1.

Thanks,

Satish

Silver

Re: Cisco 3640, NM-4T1-IMA intermittent no connectivity issue

Hi ,

Troubleshooting ATM IMA Links on Cisco 2600 and 3600 Routers

http://www.cisco.com/warp/customer/121/ima_tshoot.html

Thanks,

satish

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