display interface brief main

Function

The display interface brief command displays brief information about all interfaces on a device, including the physical status and protocol status of the interfaces, latest inbound and outbound bandwidth usage, and the number of sent and received error packets.

Format

display interface brief [ ifType ]

display interface brief [ ifType ] main

Parameters

Parameter	Description	Value
ifType	Displays brief information about the specified main interface.	-
main	Displays brief information about the main interface.	-

Parameter

Description

Value

ifType

Displays brief information about the specified main interface.

main

Displays brief information about the main interface.

Views

All views

Default Level

1: Monitoring level

Task Name and Operations

Task Name	Operations
interface-mgr	read

Usage Guidelines

Usage Scenario

Before you monitor interface status or locate an interface fault, run the display interface brief command to view the status of and statistics on the interface. The command output helps you diagnose faults.

Compared with the display interface command, the display interface brief command provides briefer interface information, focusing on the most important information.

Perform any of following operations based on the interface status and statistics:

If the interface is Down, check whether the link connection is correct or whether interface negotiation succeeds.
Interface statistics reflect traffic received and sent. If the interface has a lot of error statistics, check whether the interface is attacked or whether the link quality is stable.

Follow-up Procedure

Run the reset counters interface command to delete interface statistics displayed using the display interface brief command.

Example

The actual command output varies according to the device. The command output here is only an example.

# Display brief information about all interfaces on an existing device.

<HUAWEI> display interface brief
PHY: Physical
*down: administratively down
^down: standby
(l): loopback
(s): spoofing
(E): E-Trunk down
(b): BFD down
(B): Bit-error-detection down
(e): ETHOAM down
(d): Dampening Suppressed
(p): port alarm down
(ld): loop-detect trigger down
(td): transceiver unmatch down
(mf): mac-flapping blocked
(c): CFM down
(sd): STP instance discarding
InUti/OutUti: input utility/output utility
Interface                   PHY   Protocol  InUti OutUti   inErrors  outErrors
Eth-Trunk0                  down  down         3%      7%        12          0
Eth-Trunk1                  down  down         0%      0%         0          0
GigabitEthernet0/1/1        down  down         0%      0%         0          0
GigabitEthernet0/1/2.1      down  down         0%      0%         0          0
GigabitEthernet0/1/3       *down  down        50%     30%         0          0
GigabitEthernet0/1/4(10G)   down  down         0%      0%         0          0
GigabitEthernet0/1/4.1(10G) down  down         0%      0%         0          0
GigabitEthernet0/1/8        up(l) up           0%      0%         0          0
GigabitEthernet0/1/16        up(l) up           0%      0%         0          0
GigabitEthernetGigabitEthernet0/0/0        up    up        0.01%  0.01%          0          0                                                      
GigabitEthernet0/1/0:0(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:1(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:2(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:3(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:4(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:5(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:6(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:7(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:8(10G) down  down         0%     0%          0          0                                                      
GigabitEthernet0/1/0:9(10G) down  down         0%     0%          0          0  
LoopBack0                   down  up(s)        0%      0%         0          0
NULL0                       up    up           0%      0%         0          0

**Table 1** Description of the **display interface brief main** command output
Item	Description
Interface	Name and number of an interface. If Eth-Trunk logical interfaces have member interfaces, these member interfaces are displayed in alphabetical order. The first character of each line in the output is indented by two spaces. Interface types are the same as those displayed in the display interface brief command output. Bandwidth identifier displayed in the brackets after a GE interface: Actual bandwidth of the interface. For example, the name of a 10 Gbit/s GE main interface or sub-interface is tagged with the 10G bandwidth identifier. For a main interface or sub-interface whose bandwidth is limited by a license, the bandwidth identifier is displayed after the interface name. For a main interface or sub-interface with adaptive bandwidth, the bandwidth identifier is displayed after the interface name.
PHY	Physical status of the interface. up: The physical layer of this interface is working properly. down: The physical layer of this interface becomes faulty. *down: Administratively Down. The administrator has run the shutdown command on this interface. ^down: The interface is a backup interface. (l): loopback: This interface is enabled with the loopback function. (b): BFD down: The physical layer of the interface is in the bidirectional forwarding detection (BFD) Down state. (E): E-Trunk down. The Eth-Trunk interface goes Down due to E-Trunk protocol negotiation. (p): port alarm down The interface goes Down physically due to an alarm, such as a CRC alarm.
Protocol	Link layer protocol status of the interface. up: The link layer protocol of this interface is working properly. down: The link layer protocol of this interface becomes faulty. (l): loopback: This interface is enabled with the loopback function. (s): spoofing: This interface is enabled with the spoofing function. (b): BFD down: The link layer protocol of the interface is in the BFD Down state. (B): Bit-error-detection down, The data link layer of the interface is in the Bit-error-detection down state. (e): ETHOAM down: The physical layer of the interface is in the Ethernet in the First Mile (EFM) fault state. (d): dampening suppressed: The protocol of the interface is suppressed. (ld): loop-detect trigger down. The interface is set to Down to prevent a loop. (c): CFM down. The interface goes Down due to the CFM configuration. (mf): mac-flapping blocked. Traffic on the interface is interrupted due to a network loop. (sd): STP instance discarding. Traffic on the interface is blocked because the loop is disconnected due to STP calculation. Blank: The interface is not configured with a link layer protocol.
InUti	Average inbound bandwidth usage of this interface in the last 300 seconds. Average inbound bandwidth usage in the last 300 seconds = Average inbound rate in the last 300 seconds/Interface bandwidth. When the average inbound bandwidth usage is lower than 0.01% and this interface is receiving traffic, value 0.01% is displayed. When the interface bandwidth becomes lower, bandwidth usage may become 100% because adjusting the traffic volume is delayed. Hyphens (--) indicates that this type of interface does not support the display of bandwidth usage. You can run the set flow-stat interval command to change the interval at which traffic statistics are collected.
OutUti	Average outbound bandwidth usage in the last 300 seconds. Average outbound bandwidth usage in the last 300 seconds = Average outbound rate in the last 300 seconds/Interface bandwidth. When the average outbound bandwidth usage is lower than 0.01% and this interface is sending traffic, value 0.01% is displayed. When the interface bandwidth becomes lower, bandwidth usage may become 100% because adjusting the traffic volume is delayed. Hyphens (--) indicates that this type of interface does not support the display of bandwidth usage. You can run the set flow-stat interval command to change the interval at which traffic statistics are collected.
inErrors	Number of error packets received by an interface. After the reset counters interface command is run in the user view or the number of received error packets reaches the maximum value 0xFFFFFFFF, the number of received error packets is set to 0.
outErrors	Number of error packets sent by an interface. After the reset counters interface command is run in the user view or the number of sent error packets reaches the maximum value 0xFFFFFFFF, the number of sent error packets is set to 0.