怎么查看链路拥塞，丢包

交换机的话直接dis interface查看对应接口last 300 sec的值，也可以在接口下通过flow-interval 5更改查看周期为5S，如果查看到Last 5 seconds input到了带宽值或者接近了，则可能发生了拥塞。查看丢包的话也可以通过在设备上流统来确认

[2032-S10500]dis int Ten-GigabitEthernet 1/2/0/1
Ten-GigabitEthernet1/2/0/1
Current state: DOWN
Line protocol state: DOWN
IP packet frame type: Ethernet II, hardware address: 84d9-3123-b800
Description: Ten-GigabitEthernet1/2/0/1 Interface
Bandwidth: 10000000 kbps
Loopback is not set
Media type is not sure, port hardware type is no connector
Unknown-speed mode, unknown-duplex mode
Link speed type is autonegotiation, 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: 0
Last link flapping: Never
Last clearing of counters: Never
Current system time:2023-06-18 09:12:50
Last time when physical state changed to up:-
Last time when physical state changed to down:2023-06-12 09:42:49
 Peak input rate: 0 bytes/sec, at 2023-06-12 09:43:27
 Peak output rate: 0 bytes/sec, at 2023-06-12 09:43:27
 Last 5 seconds input: 0 packets/sec 0 bytes/sec -%
 Last 5 seconds output: 0 packets/sec 0 bytes/sec -%
 Input (total):  0 packets, 0 bytes
         0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses
 Input (normal):  0 packets, - bytes
         0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses
 Input:  0 input errors, 0 runts, 0 giants, 0 throttles
         0 CRC, 0 frame, - overruns, 0 aborts
         - ignored, - parity errors
 Output (total): 0 packets, 0 bytes
         0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses
 Output (normal): 0 packets, - bytes
         0 unicasts, 0 broadcasts, 0 multicasts, 0 pauses
 Output: 0 output errors, - underruns, - buffer failures
         0 aborts, 0 deferred, 0 collisions, 0 late collisions
         0 lost carrier, - no carrier