I have a switch stack consisting of one 3750-24TS-S and one 3750G-24-S. Originally each unit was configured with a name and a management IP address, then the two units were connected via the stacking cable(s). No other configuration was done; this is just a plain vanilla backbone.
When viewed through Cisco Network Assistant the stack appears as one unit. I try to always boot the 3650G first, so its name and IP address appears as the stack address. There is very limited information available about the member unit either from CNA or the command line regardless of which console port I connect to (posters here warned me about that before I bought the 3750s; they were right).
I also have an RPS unit connected to the DC input of each switch as a rudimentary redundent power solution.
All working fine, until the AC power supply on the 3750-24TS went bad. The RPS picked up as designed (and I then found that even though the RPS unit weights 15 kg and could probably start my car, it will only supply one unit at a time. Another lesson). Cisco RMA'd me a replacement unit and last night I tried to put it in.
Problem: the replacement 3750-24TS will not operate as part of the stack. If I boot it standalone it comes up, asks for a name and IP address, and then brings all 26 ports up. But if I then connect it to the stack it boots, gets to the show ver equivalent in the boot sequence, and freezes. The two tops status LEDs are green, but all other LEDs are dark and the ports do not come up. This is true whether I give it the same name/IP as the original unit, a different name/IP than the original unit, or just leave it unconfigured when I bring it up in the stack.
I thought to download the saved config via CNA, but there is no way to access the 2nd unit. The only thing I see from the command line is that the 3750G master thinks it has a stacking cable attached, but I can't get anything on the replacement member.
Is the replacement unit bad, or is there another configuration recovery procedure that I need to execute?