I just realized that Cisco 3825 actually has only 2 NM slots, it appeared to have 3 NM slots but only slot 1 and slot 2 have an internal connector, the third unnumbered slot only has a bracket within.
My Cisco 3825 crashed, perhaps my NMs did not installed properly….I am not sure.
Slot 1 was NM-8A/S
Slot 2 was NM-4A/S
I swapped the position:
Slot 1 is NM-4A/S
Slot 2 is NM-8A/S
Here’s the output while router is rebooting:
Cisco 3825 (revision 1.2) with 224256K/37888K bytes of memory.
2 Gigabit Ethernet interfaces
12 Low-speed serial(sync/async) interfaces
1 Channelized (E1 or T1)/PRI port
1 Virtual Private Network (VPN) Module
DRAM configuration is 64 bits wide with parity enabled.
479K bytes of NVRAM.
250200K bytes of ATA System CompactFlash (Read/Write)
NM is extended, instead of recognizing serial NMs individually the total number of ports were combined.
— System Configuration Dialog —
Would you like to enter the initial configuration dialog? [yes/no]: no
Would you like to terminate autoinstall? [yes]: no
Please Wait. Autoinstall being attempted over Serial1/0 !!!!!!!!!!!!!
Auto installation was performed for slot 1 (NM 4A/S)