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Monitoring the Status of Logical Interfaces

Network Director provides real-time statistics on logical Ethernet switching interfaces for switches, routers, Virtual Chassis, and Layer 3 Fabrics.

This topic describes:

Locating Information about Logical Interfaces

Real-time logical interface statistics, including VLAN information, are available from the Show Logical Interfaces window in Monitoring mode. To find this information:

  1. Select Monitor in the Network Director banner.
  2. Select a node in the View pane that contains the logical interface you want to monitor.
  3. Select the Equipment tab.
  4. Click Logical Interfaces in the Tasks pane to open the Show Logical Interface Information table in main window.

Show Logical Interface Information Table

The Show Logical Interface Information table provides interface, VLAN, and spanning-tree status for an interface. The information is presented in a tabular format. The fields in the Show Logical Interface Information table are described in Table 1.

Table 1: Show Logical Interface Information Fields



Logical Interface Name

The logical interface name.

Serial Number

The serial number of the device to which the logical interface belongs.

VLAN Membership ID

The VLAN to which the interface belongs.

Bridge Domain Membership

The bridge domain to which the interface belongs (for only devices that do not use the Enhanced Layer 2 Software (ELS) ).

802.1Q Tag

The IEEE 802.10 identifier for the VLAN.


Indicates whether the packets entering the port are tagged or untagged.

Logical Interface State

Indicates whether the logical interface is up or down.

STP State

Indicates whether the interface is discarding (blocked) or forwarding (unblocked).

Port Mode

Indicates one of three modes: access, tagged-access, or trunk.

  • Access—The interface can be in a single VLAN only.

  • Tagged-access—The interface can accept tagged packets from one access device.

  • Trunk—The interface can be in multiple VLANs and accept tagged packets from multiple devices.