Ver y borrar estadísticas de tráfico en una interfaz

Depende del modelo de tu router, pero te envío por ejemplo un NE40M2F:

Ver estadísticas:
Al mostrar la interface, te incluye las estadísticas:
<Huawei>dis inte gi0/3/21
GigabitEthernet0/3/21 current state : UP (ifindex: 27)
Line protocol current state : DOWN
Link quality grade : GOOD
Description: Hacia M10i Proceres ge-0/3/1.4070 | | ROADM A3615
Route Port,The Maximum Transmit Unit is 1500
Internet protocol processing : disabled
IP Sending Frames' Format is PKTFMT_ETHNT_2, Hardware address is 68cc-6ea5-7c19
The Vendor PN is RTXM191-400
The Vendor Name is WTD
Port BW: 1G, Transceiver max BW: 1G, Transceiver Mode: SingleMode
WaveLength: 1310nm, Transmission Distance: 10km
Rx Power: -7.37dBm, Warning range: [-20.000, -3.000]dBm
Tx Power: -6.02dBm, Warning range: [-9.003, -3.000]dBm
Loopback: none, full-duplex mode, negotiation: disable, Pause Flowcontrol: Receive Enable and Send Enable
Last physical up time : 2020-06-10 14:51-06:00
Last physical down time : 2020-06-10 14:51-06:00
Current system time: 2020-06-10 14:51-06:00
Statistics last cleared:never
Last 300 seconds input rate: 0 bits/sec, 0 packets/sec
Last 300 seconds output rate: 108 bits/sec, 0 packets/sec
Input peak rate 0 bits/sec, Record time: -
Output peak rate 179 bits/sec, Record time: 2020-06-10 14:51-06:00
Input: 0 bytes, 0 packets
Output: 971200156 bytes, 2446348 packets
Input:
Unicast: 0 packets, Multicast: 0 packets
Broadcast: 0 packets, JumboOctets: 0 packets
CRC: 0 packets, Symbol: 0 packets
Overrun: 0 packets, InRangeLength: 0 packets
LongPacket: 0 packets, Jabber: 0 packets, Alignment: 0 packets
Fragment: 0 packets, Undersized Frame: 0 packets
RxPause: 0 packets
Output:
Unicast: 0 packets, Multicast: 2446348 packets
Broadcast: 0 packets, JumboOctets: 0 packets
Lost: 0 packets, Overflow: 0 packets, Underrun: 0 packets
System: 0 packets, Overruns: 0 packets
TxPause: 0 packets
Last 300 seconds input utility rate: 0.00%
Last 300 seconds output utility rate: 0.01%

-Limpiar estadísticas:
<Huawei>reset statistics interface GigabitEthernet 0/3/21