ATM IMA group fails when one of the three T1's goes down

Unanswered Question
May 31st, 2007

I've got a 3845 w/ATM AIM module and 4 T1 controller interfaces. The IMA group has 3 T1's in the group. When any one of the three T1's in this group does down, the entire IMA interface goes down. I've checked the min interfaces for the ima group to be up, it's currently at 1. I'm not getting much help from TAC so far. They wanted me to try a different version of IOS since the one we were running on has an advisory. I could not find any bugs related to this issue on this version. I've now running the TAC recommended ver 12.4(10b). That did not help. Still have the issue.

Feels like a config issue, but I've not been able to pin it down. Below are some config snippits and a "show ima interface" output.

Any help would be appreciated.

network-clock-participate wic 0

network-clock-participate wic 1

no network-clock-participate wic 2

network-clock-participate aim 0

network-clock-select 1 T1 0/0/0

network-clock-select 5 T1 0/0/1

network-clock-select 8 T1 0/1/0

controller T1 0/0/0

mode atm aim 0

framing esf

linecode b8zs

description ***** T1 Interface - ATM IMA Bundle

!

controller T1 0/0/1

mode atm aim 0

framing esf

linecode b8zs

description ***** T1 Interface - ATM IMA Bundle

!

controller T1 0/1/0

mode atm aim 0

framing esf

linecode b8zs

description ***** T1 Interface - ATM IMA Bundle

interface ATM0/IMA0

description **** ATM IMA Interface

no ip address

ip route-cache flow

atm bandwidth dynamic

no atm ilmi-keepalive

!

interface ATM0/IMA0.40 point-to-point

ip address < removed >

ip nat inside

ip virtual-reassembly

no snmp trap link-status

pvc 1/40

vbr-nrt 4608 4608

tx-ring-limit 3

max-reserved-bandwidth 100

CMC-TUC-3845#show ima interface

Interface ATM0/IMA0 is up

Group index is 28

Ne state is operational, failure status is noFailure

IMA Group Current Configuration:

Tx/Rx minimum required links 1/1

Maximum allowed diff delay is 25ms, Tx frame length 128

Ne Tx clock mode CTC, configured timing reference link ATM0/0/0

Test pattern procedure is disabled

IMA Group Total Counters (time elapsed 735 seconds):

466572 Tx cells, 629004 Rx cells

1 Ne Failures, 10 Fe Failures, 228 Unavail Secs

IMA link Information:

Link Physical Status NearEnd Rx Status Test Status

---- --------------- ----------------- -----------

ATM0/0/0 up active disabled

ATM0/0/1 up active disabled

ATM0/1/0 up

I have this problem too.
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mohammedmahmoud Fri, 06/01/2007 - 04:24

Hi,

Can you please clarify the status of the interfaces:

ATM0/0/0 up active disabled

ATM0/0/1 up active disabled

ATM0/1/0 up

BR,

Mohammed Mahmoud.

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