Commands it reads
| show version | Software change and reloads |
| show ip interface brief | Interfaces that dropped, came up or changed IP |
| show interfaces status | Ports disconnected, err-disabled or moved VLAN |
| show ip ospf neighbor | Lost or stuck adjacencies, with an MTU hint |
| show ip bgp summary | Peers down and prefix-count swings |
| show cdp neighbors | Neighbours no longer seen |
| show ip route | Missing routes and routes learned differently |
| anything else | Line-by-line differences for you to read |
Abbreviations work (sh ip int br). Paste the whole terminal session with prompts, or one command's output at a time.