Interface configuration process of layer-3 Switch Load Balancing (1)

Layer-3 Switch configuration-configure a group of layer-2 ports

 
 

  
  
Configure terminal enters configuration status
  
  
Nterface range {port-range} enters the group configuration status
 
 

Layer-3 Switch configuration-configure Layer-3 Ports

 
 

  
  
Configure terminal enters configuration status
  
  
Interface {fastethernet | gigabitethernet} interface-id} | {vlan-id} | {port-channel-number} enter the port configuration status
  
  
No switchport changes the physical port to a layer-3 Port
  
  
Ip address ip_address subnet_mask configure the ip address and mask
  
  
No shutdown activation Port
 
 

Example:

 
 

  
  
Switch(config)# interface gigabitethernet0/2 
  
  
Switch(config-if)# no switchport 
  
  
Switch(config-if)# ip address 192.20.135.21 255.255.255.0 
  
  
Switch(config-if)# no shutdown 
 
 

Layer-3 Switch configuration --Configure VLAN

 
 

  
  
Configure terminal enters configuration status
  
  
 
  
  
Vlan-id: enter a VLAN id and then enter the vlan configuration state. You can enter a new VLAN id or the old one for modification.
  
  
 
  
  
Name vlan-name (optional) enter a VLAN name. If no VLAN name is configured, the default name is the four-digit number filled with 0 before the VLAN number. For example, VLAN0004 is the default name of vlan4.
  
  
 
  
  
Mtu-size (optional) Change MTU size
 
 

Example:

 
 

  
  
Switch # configure terminal
  
  
Switch (config) # vlan 20
  
  
Switch (config-vlan) # name test20
  
  
Switch (config-vlan) # end
  
  
Or
  
  
Switch # vlan database
  
  
Switch (vlan) # vlan 20 name test20
  
  
Switch (vlan) # exit
 
 

Layer-3 Switch configuration-- The port is assigned to a VLAN.

 
 

  
  
Configure terminal enters configuration status
  
  
Interface-id: enter the port to be allocated
  
  
Switchport mode access defines L2 ports
  
  
Switchport access vlan-id assigns a port to a VLAN
 
 

Example:

 
 

  
  
Switch # configure terminal
  
  
Enter configuration commands, one per line. End with CNTL/Z.
  
  
Switch (config) # interface fastethernet0/1
  
  
Switch (config-if) # switchport mode access
  
  
Switch (config-if) # switchport access vlan 2
  
  
Switch (config-if) # end
  
  
Switch #
  
  
Configure VLAN trunk
  
  
Configure terminal enters configuration status
  
  
Interface-Id: enter the port configuration status
  
  
Switchport trunk encapsulation {isl | dot1q | negotiate} configure trunk to encapsulate ISL or 802.1Q or
 
 

Layer-3 Switch configuration-Automatic negotiation

Example:

 
 

  
  
Switchport mode {dynamic {auto | desirable} | trunk}: configure the layer-2 trunk mode.
  
  
Dynamic auto-automatically negotiate whether it is a trunk
  
  
Dynamic desirable-set the port to trunk. If the peer ports are trunk and desirable, configure Native VLAN
  
  
802.1q) or in automatic mode, trunk-sets the port to the forced trunk mode, regardless of whether the peer port is trunkswitchport access vlan-id (optional)
  
  
Specify a default VLAN. If the port is no longer trunkswitchport trunk native vlan-id, specify the 802.1Q native VLAN number.
 
 

 
 

  
  
Switch# configure terminal 
  
  
Enter configuration commands, one per line. End with CNTL/Z. 
  
  
Switch(config)# interface fastethernet0/4 
  
  
Switch(config-if)# switchport mode trunk 
  
  
Switch(config-if)# switchport trunk encapsulation dot1q 
  
  
Switch(config-if)# end 
 
 

Layer-3 Switch configuration --Define the VLAN allowed by the TRUNK

 
 

  
  
Configure terminal Sub-entry configuration status
  
  
Interface-id: enter port configuration
  
  
Switchport mode trunk: configure the Layer 2 port as trunk
  
  
Switchport trunk allowed vlan {add | all | listen t | remove} vlan-list (optional) configure the VLAN allowed by the trunk. Use add, all, listen t, remove
  
  
No switchport trunk allowed vlan allows all VLANs to pass through
 
 

Example:

 
 

  
  
Switch(config)# interface fastethernet0/1 
  
  
Switch(config-if)# switchport trunk allowed vlan remove 2 
  
  
Switch(config-if)# end 
 
 

Layer-3 Switch configuration-configure Native VLAN802.1q)

 
 

  
  
Configure terminal enters configuration status
  
  
Interface-id: enter the port configured as 802.1qtrunk
  
  
Switchport trunk native vlan-Id configuration native VLAN number
  
  
No switchport trunk native vlan port configuration command returns to the default status
 
 

Layer-3 Switch configuration-configure Load Balancing Based on port Weights

 
 

  
  
Configure terminal enters Switch 1 configuration status
  
  
Vtp domain-name configuration VTP domain
  
  
Vtp mode server configures Switch 1 to VTP server.
  
  
Show vtp status verify VTP Configuration
  
  
Show vlan verification VLAN
  
  
Configure terminal enters configuration status
  
  
Interface fastethernet 0/1 enters port F0/1
  
  
Switchport trunk encapsulation {isl | dot1q | negotiate} configure trunk encapsulation
  
  
Configure switchport mode trunk to trunk
  
  
Show interfaces fastethernet0/1 switchport verify VLAN configuration