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L2-Switch.md

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L2 Switch

This document refers to IOSv-L2 switch.

Usage

After starting the switch, you can open a console to manage and configure it and use the following commands to configure the switch:

Getting Help

  • ?: Command shows a list of available commands. You can add a command name to get help on a specific command.

Configuration Mode

  • sh enable: Enter privileged mode. This is required to configure the switch.
  • conf t: Enter terminal configuration mode
  • interface <interface>: Enter interface configuration mode
  • exit: Exit from the current mode

Show Configuration

  • show interfaces: Show interfaces
  • show interfaces status: Show interface statuses
  • show interfaces description: Show interface descriptions
  • show interfaces <interface>: Show detailed information about the interface

VLAN

  • vlan <vlan-id>: Create a VLAN. VLAN ID must be between 1 and 4094. Enters VLAN configuration mode.

  • name <name>: Set the name of the VLAN.

  • show vlan: Show VLANs

  • show interfaces switchport: Show switchport configuration

    Access Port

    Run the following commands in interface configuration mode to configure an access port:

    • switchport mode access: Configure interface as access port
    • switchport access vlan <vlan-id>: Assign the access port a VLAN

    Trunk Port

    Run the following commands in interface configuration mode to configure a trunk port:

    • switchport trunk encapsulation dot1q: Configure trunk encapsulation as 802.1Q
    • switchport mode trunk: Configure interface as trunk port
    • switchport trunk allowed vlan <vlan-id>: Assign allowed VLANs to the trunk port

STP

  • spanning-tree vlan 1 : Enable STP for VLAN 1
  • show spanning-tree: Show STP configurations
  • spanning-tree priority <value>: Change switch priority value
  • spanning-tree vlan 1 root primary: Set switch as primary root bridge
  • clear spanning-tree [interface]: Clear STP for an interface
  • spanning-tree port-priority [interface] [priority] : Set priority for an interfaceü
  • no spanning-tree vlan 1 : Disable STP for VLAN 1