Switch Configuration

Switch Configuration

1. Basic Switch Configuration

   • Configure a Switch with Initial Settings
     • Switch Boot Sequence
       • 1. First, the switch loads a power-on self-test (POST) program stored in ROM 2. Next, the switch loads the boot loader software. 3. The boot loader performs low-level CPU initialization. 4. The boot loader initializes the flash file system on the system board. 5. Finally, the boot loader locates and loads a default IOS operating system software image into memory and gives control of the switch over to the IOS.
     • Recovering From a System Crash
       • Step 1. Connect a PC by console cable to the switch console port. Step 2. Unplug the switch power cord. Step 3. Reconnect the power cord to the switch and, within 15 seconds, press and hold down the Mode button while the System LED is still flashing green. Step 4. Continue pressing the Mode button until the System LED turns briefly amber and then solid green; then release the Mode button. Step 5. The boot loader switch.
     • Switch LED Indicators
     • Preparing for Basic Switch Management
       • o prepare a switch for remote management access, the switch must be configured with an IP address and a subnet mask. Keep in mind, that to manage the switch from a remote network, the switch must be configured with a default gateway.
     • Configuring Basic Switch Management Access with IPv4
       • Step 1. Configure Management Interface. Step 2. Configure Default Gateway. Step 3. Verify Configuration
   • Configure Switch Ports
     • Duplex Communication
     • Configure Switch Ports at the Physical Layer
     • Auto-MDIX
     • Verifying Switch Port Configuration
     • Network Access Layer Issues
     • Troubleshooting Network Access Layer Issues

2. Switch Security

   • Secure Remote Access
     • SSH Operation
       • Secure Shell (SSH) is a protocol that provides a secure (encrypted) management connection to a remote device. SSH should replace Telnet for management connections. Telnet is an older protocol that uses unsecure plaintext transmission of both the login authentication (username and password) and the data transmitted between the communicating devices.
     • Configuring SSH
     • Verifying SSH
       • On a PC, an SSH client such as PuTTY, is used to connect to an SSH server.
   • Switch Port Security
     • Secure Unused Ports
       • Disable Unused Ports
         • Switch(config)# interface range type module/first-number – last-number
   • Port Security: Operation
     • Port Security
       • Secure MAC Address Types
         • Static secure MAC addresses - MAC. Dynamic secure MAC addresses - MAC. Sticky secure MAC addresses - MAC
   • Port Security: Violation Modes
   • Port Security: Configuring
   • Port Security: Verifying
     • Verify Port Security. Verify Port Security Settings. Verify Secure MAC Addresses
   • Ports in Error Disabled State
     • When a port is configured with port security, a violation can cause the port to become error disabled. When a port is error disabled, it is effectively shut down and no traffic is sent or received on that port. A series of port security related messages display on the console

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