ITC/3AV WIKI

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**ACCESS OR TRUNK PORT**


Note：By default , trunk port carries traffic for all vlans that is created , and we strongly recommend you to prune every trunk port to allow only the traffic of useful vlan pass through in case that unknown unicast ,broadcast and multicast packets floods through the overall network ,leading to a heavier CPU burden and useless consumption of system resource.

 
**Bold Text**
**I. Configuration Steps**

**1.  Configuring access port**

The following example shows how to configure interface F0/1 as an access port and assign interface F0/1 to VLAN 100

Ruijie>en

Ruijie#conf t

Ruijie(config)#interface fastEthernet 0/1

Ruijie(config-if)#switchport mode access

Ruijie(config-if)#switchport access vlan 100

Ruijie(config-if)#end

Ruijie#wr

 

Note：By default, all ports are access mode and belongs to VLAN 1

Enter "show vlan" privilege EXEC command to verify that interface F0/1 belongs to VLAN 100

Ruijie# show vlan

VLAN Name                             Status    Ports    

---- -------------------------------- --------- -----------------------------------

   1 VLAN0001                         STATIC   Fa0/3, Fa0/4, Fa0/5           

                                                Fa0/6, Fa0/7, Fa0/8, Fa0/9           

                                                Fa0/10, Fa0/11, Fa0/12, Fa0/13       

                                                Fa0/14, Fa0/15, Fa0/16, Fa0/17       

                                                Fa0/18, Fa0/19, Fa0/20, Fa0/21       

                                                Fa0/22, Fa0/23, Fa0/24, Fa0/25       

                                                Fa0/26, Fa0/27, Fa0/28, Fa0/29       

                                                Fa0/30, Fa0/31, Fa0/32, Fa0/33       

                                                Fa0/34, Fa0/35, Fa0/36, Fa0/37       

                                                Fa0/38, Fa0/39, Fa0/40, Fa0/41       

                                                Fa0/42, Fa0/43, Fa0/44, Fa0/45       

                                                Fa0/46, Fa0/47, Fa0/48, Gi0/49       

                                                Gi0/50                               

 100 VLAN0100                       STATIC    Fa0/1,Fa0/2

 

**2.  Configuring trunk port**

The following example shows how to configure interface G0/49 as a trunk port

Ruijie#configure terminal

Ruijie(config)#interface gigabitEthernet 0/49

Ruijie(config-if)#switchport mode trunk

Ruijie(config-if)#end

 

 In the following example, "show interface trunk" privilege EXEC command is used to verify all trunk port status

Ruijie# **show interfaces trunk**

Interface                      Mode   Native VLAN VLAN lists

------------------------ ------ ----------- ----------

FastEthernet 0/48            Off    1           ALL

GigabitEthernet 0/49     On     1           ALL     

GigabitEthernet 0/50       Off    1           ALL

 

**3. Pruning a Trunk port (Mandatory)**

This example shows how to prune a trunk port to carry traffic only for vlan 5, 10 and 20-30

Ruijie#**configure terminal**

Ruijie(config)#interface gigabitEthernet 0/1

Ruijie(config-if-GigabitEthernet 0/1)#switchport mode trunk

Ruijie(config-if-GigabitEthernet 0/1)#switchport trunk allowed vlan remove 1-4,6-9,11-19,31-4094  

Ruijie(config-if-GigabitEthernet 0/1)#end

Ruijie#wr