Each log message, sent from the switch to the log host, can have its source address set to the same value.
This is useful because the administrator can distinguish at the log host which switch sent the log. Also,
the administrator can create an access-list that allows only one source address per switch to send logs.
The following command sets the source address by using one of the interfaces of the switch. Thus, this
interface must be configured with an IP address for this setting to be successful. The Loopback 0
interface would be a good choice for the source address.