Viewing Interface Statistics
Packets that need to be forwarded to the adjacent network element or a neighboring device along a routing path might be dropped by a router owing to several factors. Some of the causes for such a loss of traffic or a block in transmission of data packets include overloaded system conditions, profiles and policies that restrict the bandwidth or priority of traffic, network outages, or disruption with physical cable faults. You can use a number of show commands to determine and analyze the statistical counters and metrics related to any traffic loss and take an appropriate corrective measure. The fields displayed in the View Interface Statistics dialog box help in diagnosing and debugging network performance and traffic-handling efficiency problems.
To view interface statistical details:
- From the View selector, select Service View.
The functionalities that you can configure in this view are displayed on the View pane.
- Click the Monitor mode icon in the Service
View of the Connectivity Services Director banner.
The workspaces that are applicable to this mode are displayed on the Tasks pane.
- From the Service View pane, select the type of service
for which you want to view interface statistics.
The service statistical details are displayed in the middle pane.
- From the Tasks pane, which is displayed on the right,
select Tasks > Show Interface Statistics.
The End Point Details dialog box is displayed for the selected service.
The Interface Traffic Statistics dialog box displays only the managed endpoints of the E-Line service. Unmanaged device endpoints are not shown in the grid, and therefore the charts are also not applicable for unmanaged endpoints of the E-Line service.
A graphical view and a tabular view of interface statistics are displayed. You can view the interface statuses, such as errors and the operational conditions of the interfaces, that enables you in analyzing, troubleshooting, and rectifying problems with dropped packets or untransmitted bytes. Some of the causes for such a loss of traffic or a block in transmission of data packets include overloaded system conditions, profiles and policies that restrict the bandwidth or priority of traffic, network outages, or disruption with physical cable faults. This operation is equivalent to the show interface statistics command that you can run from the Junos OS CLI interface. You can search for specific devices or interfaces by entering a search item and clicking the Search icon. A line graph is displayed with the input packets and errors, and output packets and errors shown on the vertical axis and the time shown on the horizontal axis. The following color-coded legends reference the line graphs:
Packets In (Orange)—Number of packets received on the interface
Packets Out (Green)—Number of packets sent from the interface
Errors In (Blue)—Number of inbound errors received on the interface
Errors Out (Purple)—Number of outbound errors transmitted from the interface
The Interface Details table displays all the UNI parts of the service. Also, the physical interface for the logical interface participating in the service is displayed.
Device Name—Name of the device
Interface—Name of the interface
Interface Type—Whether the interface is physical or logical
Encapsulation—Physical or logical encapsulation configured on the interface.
Operational Status—Operational status of the physical interface: Up, Down.
Admin Status—Administrative state of the interface: Enabled or Disabled.
MAC Address—MAC address of the physical interface.
Input Packets—Number of packets received on the interface.
Output Packets—Number of packets sent from the interface.
Last Poll Time—Date and time at which the statistical detail was obtained by polling and retrieving from the device for the specified interface.
The Packet Counter tab on the right side of the page displays the following fields in a table. It is applicable for physical interfaces only. The values displayed are in rates of packets per second.
Input Unicasts—Number of input unicast packets for the physical interface
Output Unicasts—Number of output unicast packets for the physical interface
Input Multicast—Number of input multicast packets for the physical interface
Output Multicast—Number of output multicast packets for the physical interface
Input Broadcast—Number of input broadcast packets for the physical interface
Output Broadcast—Number of output broadcast packets for the physical interface
The Error Counter tab on the right side of the page displays the following fields in a table. It is available for physical interfaces only. The values displayed are in rates of packets per second.
Input Errors—Number of errors packets received on the physical interface
Output Drops—Number of outgoing packets that are dropped by the physical interface
Input Framing Errors—Number of packets with framing errors that are received on the physical interface
Input Drops—Number of incoming packets that are dropped by the physical interface
Input Discards—Number of incoming packets discarded by the physical interface
Output Errors—Number of error packets sent out from the physical interface