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Vlan switch port modes


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Vlan switch port modes

  1. 1. VLAN Switch Port Modes When you configure a VLAN, you must assign it a number ID, and you can optionally give it a name. The purpose of VLAN implementations is to associate ports with particular VLANs. You configure the port to forward a frame to a specific VLAN. As mentioned previously–Types of VLAN - you can configure a VLAN in voice mode to support voice and data traffic coming from a Cisco IP phone. You can configure a port to belong to a VLAN by assigning a membership mode that specifies the kind of traffic the port carries and the VLANs to which it can belong. A port can be configured to support these VLAN types: Static VLAN This is when Ports on a switch are manually assigned to a VLAN. Static VLANs are configured using the Cisco CLI. This can also be accomplished with GUI management applications, such as the Cisco Network Assistant. However, a convenient feature of the CLI is that if you assign an interface to a VLAN that does not exist, the new VLAN is created for you. Static Port mode configuration Switch#config t Switch(config)#interface fastEthernet0/15 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10 Switch(config-if)#end Dynamic VLAN A dynamic port VLAN membership is configured using a special server called a VLAN
  2. 2. Membership Policy Server (VMPS). With the VMPS, you assign switch ports to VLANs dynamically, based on the source MAC address of the device connected to the port. The benefit comes when you move a host from a port on one switch in the network to a port on another switch in the network; the switch dynamically assigns the new port to the proper VLAN for that host. Voice VLAN A port is configured to be in voice mode so that it can support an IP phone attached to it . Before you configure a voice VLAN on the port, you need to first configure a VLAN for voice and a VLAN for data.
  3. 3. Voice mode Configuration Switch#config t Switch(config)#interface fastEthernet 0/15 Switch(config-if)#mlsqos trust cos Switch(config-if)#switchport voice vlan 99 Switch(config-if)#switchport mode access Switch(config-if)#switchport access vlan 10 Switch(config-if)#end The configuration command mlsqos trust cos ensures that voice traffic is identified and given priority traffic. Remember that the entire network must be set up to prioritize voice traffic. You cannot just configure the port with this command. The switchport voice vlan 99 commands identifies VLAN 99 as the voice VLAN. You can verify this by using the following command: Switch1#show interfaces fa0/15 switchport Name: Fa0/15 Switchport: Enabled Administrative Mode: static access Operational Mode: down Administrative Trunking Encapsulation: dot1q
  4. 4. Negotiation of Trunking: off Access mode VLAN: 10 (VLAN0010) Trunking Native Mode VLAN: 1(default) Administrative Native VLAN tagging: enabled Voice VLAN: 99 (VLAN099) The switchport access vlan 10 command configures VLAN 10 as the access mode (data) VLAN. You can see this verified in the bottom screen capture: Access Mode VLAN: 10 (VLAN0010). More Related Topics: Types of VLANs ‘What Happens in the VLAN Stays in the VLAN?’ How Private VLANs Work? How to Configure Private VLANs on Cisco 3560 Switches? VLAN Trunking Protocol (VTP) & VTP Modes