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Command Spanning-Tree Cost Use This command modifies the interface cost used in calculating the root port for spanning-tree on a switch. Lower is better. Syntax Switch(config-if)#spanning-tree cost <cost> Example In the below example we will configure SW2 to use Fa0/24 as the root port for all VLANs. CopySW2(config)#do …
Command Spanning-Tree Vlan Port-Priority Use If a loop occurs, spanning tree uses the port priority when selecting an interface to put into the forwarding state. Lower is better Syntax Switch(config-if)#spanning-tree vlan <vlan range> port-priority <priority> Example In the below example we will configure SW2 to prefer to use …
Command Switchport Access Vlan Use Sets the VLAN that the interface belongs to. Syntax Switch(config-if)#switchport access vlan <vlan # > Example In this example, port fa0/2 on SW3 is set to VLAN 10. Here is the VLAN information on SW3 before the changes. Notice that all interfaces belong …
Command Switchport Trunk Native Vlan Use Changes the native VLAN for dot1q encapsulation. Syntax Switch(config-if)#switchport trunk native vlan <vlan #> Example In this example, the native VLAN for int fa0/2 is changed. CopySW#conf t SW#int fa0/2 SW3(config-if)#switchport trunk native vlan 55 Here’s the trunking information for SW3. CopySW3(config-if)#do show …
Command Spanning-Tree Vlan Cost Use This command modifies the interface cost used in calculating the root port for spanning-tree on a switch for a specified vlan range. Lower is better. Syntax Switch(config-if)#spanning-tree vlan <vlan range> cost <cost> Example In the below example we will configure SW2 to use …
Command Switchport Mode Access Use Sets interface to access mode. Syntax Switch(config-if)#switchport mode access Example In this example int fa0/2 is set to access mode on SW4. CopySW2#conf t Enter configuration commands, one per line. End with CNTL/Z. SW2(config)#int fa0/2 SW2(config-if)#switchport mode access
Command Spanning-Tree Vlan Priority Use This command is used to change the VLAN priority for spanning-tree. Syntax Switch(config)#spanning-tree vlan priority <#> Example In the below example we will configure SW2’s priority of Vlan 1 to be 4096. CopySW1(config)#spanning vlan 1 priority 4096 Notice the priority is now 4096 …
Command IP Default-Gateway Use Provides a default-gateway for the switch to send all unknown IP packets. Allows proper communication between switches and routers. Syntax Switch(config)#ip default-gateway <ip address> Example In the below example we will configure SW1 to use a default-gateway to ping R1’s loopback0. First, we will …
Command Spanning-Tree Backbonefast Use This command will prevent a switch that has lost its link to the root switch from becoming root when the root is still running. If switches receive an inferior BPDU from a switch, backbonefast will send them the proper information for reaching the root. …
Command VTP Mode Transparent Use VTP transparent mode allows the switch to modify its VLAN databasem but will not propagate changes from a server. Additionally, VTP transparent mode allows the switch to configure extended range VLANS (1006-4094). Syntax Switch(config)#vtp mode transparent Example In the below example we will …
