We are currently running c3620-is-mz.122-12a in the 3620 routers which have the IMA module in them and they work fine (with the exception that I sure wish the IOS would support CBR on this module).
Due to the IPv4 bug we attempted to upgrade the routers. First we tried c3620-is-mz.122-17a. The code loaded, the Ethernet and serial ports worked but the ATM ports would not come up. So I went back to the software adviser and found that 12.3-1 was also recommended. Of course that version has been replaced by 12.3-1a and so I tried that. Same bad result.
I am getting the sinking feeling that support for the ATM module on the 3620 has stopped.
We have implemented the work around recommended via ACL's.
Should be just limp along on that?