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Managing VLANs

Adding Virtual LAN (VLAN) support to a Layer 2 switch offers some of the benefits of both bridging and routing. Like a bridge, a VLAN switch forwards traffic based on the Layer 2 header, which is fast, and like a router, it partitions the network into logical segments, which provides better administration, security and management of multicast traffic.

A VLAN is a set of end stations and the switch ports that connect them. You may have many reasons for the logical division, such as department or project membership. The only physical requirement is that the end station and the port to which it is connected both belong to the same VLAN.

Each VLAN in a network has an associated VLAN ID, which appears in the IEEE 802.1Q tag in the Layer 2 header of packets transmitted on a VLAN. An end station may omit the tag, or the VLAN portion of the tag, in which case the first switch port to receive the packet may either reject it or insert a tag using its default VLAN ID. A given port may handle traffic for more than one VLAN, but it can only support one default VLAN ID.

VLAN Configuration

Use the VLAN Configuration page to define VLAN groups stored in the VLAN membership table. Your switch supports up to 4091 VLANs. VLAN 1 is the default VLAN of which all ports are members. To display the VLAN Configuration page, click Switching > VLAN > Configuration in the navigation menu.

VLAN Configuration--

VLAN Configuration Fields

Field

Description

VLAN ID List

You can use this screen to create a new VLAN or delete or reconfigure an existing VLAN. Use this pull-down menu to select one of the existing VLANs, or select Create to add a new one.

VLAN ID - Individual/ Range

When Create is select from the VLAN ID List, specify the VLAN Identifier for the new VLAN. You can also enter a range of VLAN IDs.

VLAN Name

Use this optional field to specify a name for the VLAN. It can be up to 32 alphanumeric characters long, including blanks. The default is blank. VLAN ID 1 is always named "Default."

VLAN Type

This field identifies the type of the VLAN you are configuring. You cannot change the type of the default VLAN (VLAN ID = 1): it is always type "Default." When you create a VLAN, using this screen, its type will always be "Static." A VLAN that is created by GVRP registration initially has a type of "Dynamic." You can use this pull-down menu to change its type to "Static".

Participation All

Select this field to apply the same VLAN participation and tagging settings to all ports.

Use this field to specify whether all the ports will participate in this VLAN. The factory default is Autodetect. The possible values are:

  • Include: All the ports are always a member of this VLAN. This is equivalent to registration fixed in the IEEE 802.1Q standard.
  • Exclude: All the ports are never a member of this VLAN. This is equivalent to registration forbidden in the IEEE 802.1Q standard.
  • Autodetect: Specifies that all ports may be dynamically registered in this VLAN via GVRP. All ports will not participate in this VLAN unless it receives a GVRP request. This is equivalent to registration normal in the IEEE 802.1Q standard.

Tagging All

Select the tagging behavior for all the ports in this VLAN. The factory default is Untagged. The possible values are:

  • Tagged: All frames transmitted for this VLAN will be tagged.
  • Untagged: All frames transmitted for this VLAN will be untagged.

VLAN Participation

Select this field to specify per-port VLAN participation and tagging settings.

Interface

Indicates which port is associated with the fields on this line.

Status

Indicates the current value of the participation parameter for the port.

Participation

Use this field to specify whether a port will participate in this VLAN. The factory default is "Autodetect." The possible values are:

  • Include: This port is always a member of this VLAN. This is equivalent to registration fixed in the IEEE 802.1Q standard.
  • Exclude: This port is never a member of this VLAN. This is equivalent to registration forbidden in the IEEE 802.1Q standard.
  • Autodetect: Specifies that port may be dynamically registered in this VLAN through GVRP. The port will not participate in this VLAN unless it receives a GVRP request. This is equivalent to registration normal in the IEEE 802.1Q standard.

Tagging

Select the tagging behavior for this port in this VLAN. The factory default is "Untagged." The possible values are:

  • Tagged: all frames transmitted for this VLAN will be tagged.
  • Untagged: all frames transmitted for this VLAN will be untagged.

If you make any changes to the page, click Submit to apply the changes to the system. To delete a VLAN, select the VLAN from the VLAN ID and Name field, and click Delete. You cannot delete the default VLAN.

VLAN Status

Use the VLAN Status page to view information about the VLANs configured on your system. To access the VLAN Status page, click Switching > VLAN > Status in the navigation menu.

VLAN Status

VLAN Status Fields

Field

Description

VLAN ID

The VLAN Identifier (VID) of the VLAN. The range of the VLAN ID is 1 to 4093.

VLAN Name

The name of the VLAN. VLAN ID 1 is always named Default.

VLAN Type

The VLAN type, which can be one of the following:

  • Default: (VLAN ID = 1) -- always present
  • Static: A VLAN you have configured
  • Dynamic: A VLAN created by GVRP registration that you have not converted to static, and that GVRP may therefore remove.

VLAN Port Configuration

Use the VLAN Port Configuration page to configure a virtual LAN on a port. To access the VLAN Port Configuration page, click Switching > VLAN > Port Configuration in the navigation menu.

VLAN Port Configuration

VLAN Port Configuration Fields

Field

Description

Interface

Select the interface for which you want to display or configure data. Select All to set the parameters for all ports to same values.

Port VLAN ID

Specify the VLAN ID you want assigned to untagged or priority tagged frames received on this port. The factory default is 1.

Acceptable Frame Types

Specify how you want the port to handle untagged and priority tagged frames. Whichever you select, VLAN tagged frames will be forwarded in accordance with the IEEE 802.1Q VLAN standard. The factory default is Admit All.

  • VLAN Only: The port will discard any untagged or priority tagged frames it receives.
  • Admit All: Untagged and priority tagged frames received on the port will be accepted and assigned the value of the Port VLAN ID for this port.

Ingress Filtering

Specify how you want the port to handle tagged frames:

  • Enable: A tagged frame will be discarded if this port is not a member of the VLAN identified by the VLAN ID in the tag.
  • Disable: All tagged frames will be accepted. The factory default is disable.

Port Priority

Specify the default 802.1p priority assigned to untagged packets arriving at the port.

If you change any information on the page, click Submit to apply the changes to the system.

VLAN Port Summary

Use the VLAN Port Summary page to view VLAN configuration information for all the ports on the system.To access the VLAN Port Summary page, click Switching > VLAN > Port Summary in the navigation menu.

VLAN Port Summary

VLAN Port Summary Fields

Field

Description

Interface

Identifies the physical interface associated with the rest of the data in the row.

Port VLAN ID Configured

Identifies the VLAN ID assigned to untagged or priority-tagged frames received on this port. The factory default is 1.

Port VLAN ID Current

Displays the actual VLAN ID in use for the port. If the port was acquired by another module, the actual value may differ from the configured VLAN ID.

Acceptable Frame Types

Indicates how the port handles untagged and priority tagged frames.

  • VLAN Only: The port discards any untagged or priority tagged frames it receives.
  • Admit All: Untagged and priority tagged frames received on the port are accepted and assigned the value of the Port VLAN ID for this port.

Ingress Filtering

Shows how the port handles tagged frames

  • Enable: A tagged frame is discarded if this port is not a member of the VLAN identified by the VLAN ID in the tag.
  • Disable: All tagged frames are accepted, which is the factory default.

Port Priority

Identifies the default 802.1p priority assigned to untagged packets arriving at the port.

Click Refresh to reload the page and view the most current information.

Reset VLAN Configuration

Use the Reset Configuration page to return all VLAN parameters for all interfaces to the factory default values. To access the Reset Configuration page, click Switching > VLAN > Reset Configuration in the navigation menu.

Reset VLAN Configuration

When you click Reset, the screen refreshes, and you are asked to confirm the reset. Click Reset again to restore all default VLAN settings for the ports on the system.

VLAN Internal Usage Configuration

Use the VLAN Internal Usage Configuration page to assign a Base VLAN ID for internal allocation of VLANs to the routing interface. To access the VLAN Internal Usage page, click Switching > VLAN > Internal Usage Configuration in the navigation menu.

VLAN Internal Usage Configuration

VLAN Internal Usage Configuration Fields

Field

Description

Base VLAN ID

The Base VLAN ID for Internal allocation of VLANs to the routing interface.

Allocation Policy

Allocation Policy for VLAN ID in ascending or descending order.

VLAN Internal Usage

Use the VLAN Internal Usage page to view internal allocation of VLANs to the routing interface. To access the VLAN Internal Usage page, click Switching > VLAN > Internal Usage in the navigation menu.

VLAN Internal Usage

Click Refresh to display the latest information from the router.

See Also

Configuring Switching Information

Configuring DHCP Snooping

Private VLANs

Double VLAN (DVLAN) Tunneling

Configuring Protected Ports

Managing Protocol-Based VLANs

Managing IP Subnet-Based VLANs

Managing MAC-Based VLANs

Voice VLAN Configuration

Creating MAC Filters

Configuring GARP

Configuring Dynamic ARP Inspection

Configuring IGMP Snooping

Configuring IGMP Snooping Queriers

Configuring MLD Snooping

Configuring MLD Snooping Queriers

Creating Port Channels

Viewing Multicast Forwarding Database Information

Configuring Spanning Tree Protocol

Mapping 802.1p Priority

Configuring Port Security

Managing LLDP

Dot1ad Provider Bridging

Dot1ag Connectivity Fault Management (CFM)

Operations and Management

Priority-Based Flow Control

802.1AS

Multiple Registration Protocol Configuration