There some layer 2 and layer 3 Cisco Switchs our network,And there is other project,the project about logging.I want to take some Log reports from these switchs,Which logs can ı take? For example : Which switch ports Most Port changed?
Logging depends on the network topology. You don't have to log changes to switchports connected to clients, although sometimes it's needed to troubleshoot certain problems. But you really need to log changes to switchports used to connect the switches with the routers or the other switches.
You mentioned you have layer3 switches, so I suppose these are the core switches of your network. You definitely have to take logs from those switches to prevent possible problems with the network.
As mentioned above, you need to setup a syslog server. I personally use Kiwi Syslog Daemon, which is also free but SolarWinds has a very nice one too. To avoid using a server for a simple task like logging, you could install other monitoring software on that machine as well. After all, logging is not a task that needs all of the available system resources.
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