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I recently bought a 16 port analogue modem module for my 3661 router. The 3661 router already got two 4MT module slotted into slot 1 and 2 and both working fine.
I slot in my 16 port modem module and do the aaa config and it works fine. However, about 4 days of AAA my serial ports experience some problems. Serial will be up but line protocol will be down. It happen to all the serial ports.
Out of curiosity I remove the AAA new-model and the serial ports all comes up.
This is my config
--moderator edit-- Router1#sho conf
Using 6770 out of 129016 bytes
service timestamps debug uptime
service timestamps log uptime
hostname --moderator edit-- Router1
no logging console
aaa authentication login use-radius group radius local
aaa authentication ppp use-radius if-needed group radius local
aaa authorization exec default group radius local if-authenticated
aaa authorization network default group radius local if-authenticated
There was a similar problem noted in 12.1(03a)T01 (Bug CSCds32691) which was fixed in T05. You seem to be using 12.2 and it's really strange that you are facing the problem. I think it'll be a good idea to try your configuration using a different version of the IOS.
Thank you for your response. I think I have fix my problem. I just change the encapsulation on my serial ports to hdlc. I think when the serial goes down and comes back it did try to use the AAA method.
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