I had a strange problem here after upgrading Cisco 3750X.
The upgrading was going smoothly, I copied a newer IOS to the flash from another Cisco 3750X through TFTP, changed the boot image.
It took a while do to the microcode upgrading, finally, it started to boot up. But when it completes the boot up, I can't see the nornal login prompt, but only some strange codes. From what I can see, it seems some decoding problem, as if I plug or unplug a cable from the swich, the strange code pops up again, like in normal situation, the console tells you that the interface is going up and down.
The original image of the switch: c3750e-universalk9-mz.122-53.SE2.bin
Upgrade to image: c3750e-universalk9-mz.122-55.SE3.bin
However, I don't have any problem to telnet to this switch, as it has correct IP address and login configured before the upgrading. I have reboot the switch for couple of times, reconnect to the serial port still doesn't show me anything.
I am wonering has any one has met this situation before? Thanks in advance! Below is the detailed message shown after the boot up.
cisco WS-C3750X-48 (PowerPC405) processor (revision A0) with 262144K bytes of memory.
Processor board ID FDO1449Z04L
Last reset from power-on
1 Virtual Ethernet interface
1 FastEthernet interface
52 Gigabit Ethernet interfaces
2 Ten Gigabit Ethernet interfaces
The password-recovery mechanism is enabled.
512K bytes of flash-simulated non-volatile configuration memory.
I checked the running config of this switch, I noticed that for some reason, a line called "line speed 115200" was added under "Line con 0". I did this on the boot loader only when doing the IOS transfer through Xmodem. I have already changed it back in the boot loader, I've no idea why it was added into the running config.
I just simply changed it to "line speed 9600", then everything is back to normal.
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