Switch working principle and configuration
One: Data link layer
1. Data link establishment, maintenance and teardown
2. Frame packaging, frame transmission, frame synchronization
3. Frame error checking
4. Flow control
Two: Ethernet MAC address##
Used to identify a single device or a group of devices
on an Ethernet. For the destination address
1. Physical address (unicast address-represented by 0)
2. Logical address (multicast address-represented by 1)
3. f -(Broadcast address-denoted by f)
Three: The working principle of the switch's forwarding
After the switch receives the data frame, first, it will record the source MAC address and the corresponding interface in the data frame in the MAC table, and then check whether there is information about the destination MAC address in the data frame in its MAC table, if so The data frame will be sent out according to the corresponding interface recorded in the MAC table (that is, unicast), if not, the data frame will be sent out from the non-receiving interface (that is, broadcast, or flooded).
4: Introduction to eNSP commonly used commands
1. Basic command
system-view user enters the system command abbreviation sys
sysname to modify the system name command
interface parameter (interface name) enters the interface command abbreviation int parameter (interface name)
ip address xxx.xxx.xxx.xxx subnet mask abbreviation ip add xxx.xxx.xxx.xxx Subnet mask (subnet mask can be replaced by 24)
undo Do not execute the command
quit Return to the previous view Command
return directly return to the user view command
display this to view the current configuration commands (this command can only be used in the interface view Used below) abbreviation dis this