To specify the messages to send to an enabled target, you can set a message severity level, a filter name, and a match expression. These items determine which messages are sent to the target. You can also configure the format of the messages in the targets. For example, the console display target is configured to get messages of severity info and greater, the NVRAM target gets messages of severity warning and greater, and the memory buffer target gets messages of severity debug-data and greater. All the targets are associated by default with a filter named DefaultFilter that passes all events at or above the default severity threshold. All the targets are also associated with a default match expression that matches any messages (the expression that matches any message is displayed as Match : (none) from the command line). And finally, each target has a format associated with it.
In addition, you can configure the source IP address for a syslog target. Configuring the source IP address allows the management station or syslog server to identify from which switch it received the log messages.
NoteThe address family (i.e IPv4 or IPv6) of the specified source IP address must be the same as the address family of the syslog server.