dis interface

dis interface 加管道符 匹配drop 关键字有信息显示，不加管道符却没有drop关键字，这是咋回事

<H3C>dis interface | include drop 

Input: 0 packets, 0 bytes, 0 drops 

Output: 0 packets, 0 bytes, 0 drops

 Input: 0 packets, 0 bytes, 0 drops 

Output: 0 packets, 0 bytes, 0 drops 

Input: 0 packets, 0 bytes, 0 drops 

Output: 0 packets, 0 bytes, 0 drops 

<H3C>dis interface FortyGigE1/0/53 Current state: DOWN Line protocol state: DOWN IP packet frame type: Ethernet II, hardware address: 60e8-d851-0100 Description: FortyGigE1/0/53 Interface Bandwidth: 40000000 kbps Loopback is not set 40Gbps-speed mode, unknown-duplex mode Link speed type is force link, link duplex type is autonegotiation Flow-control is not enabled Maximum frame length: 9216 Allow jumbo frames to pass Broadcast max-ratio: 100% Multicast max-ratio: 100% Unicast max-ratio: 100% PVID: 1 MDI type: Automdix Port link-type: Access Tagged VLANs: None Untagged VLANs: 1 Port priority: 2 Last link flapping: Never Last clearing of counters: Never Current system time:2023-08-17 10:28:49 Last time when physical state changed to up:- Last time when physical state changed to down:2023-08-17 09:44:24 Peak input rate: 0 bytes/sec, at 00-00-00 00:00:00 Peak output rate: 0 bytes/sec, at 00-00-00 00:00:00 Last 300 second input: 0 packets/sec 0 bytes/sec 0% Last 300 second output: 0 packets/sec 0 bytes/sec 0% Input (total): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Input (normal): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Input: 0 input errors, 0 runts, 0 giants, 0 throttles 0 CRC, 0 frame, 0 overruns, 0 aborts 0 ignored, 0 parity errors Output (total): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Output (normal): 0 packets, 0 bytes 0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses Output: 0 output errors, 0 underruns, 0 buffer failures 0 aborts, 0 deferred, 0 collisions, 0 late collisions 0 lost carrier, 0 no carrier