我们有 c3850 中继与其他交换机 4948 及其 4 个 1G 中的 LACP 4x1G 接口绑定（etherchannel），我们正在Total output drops使用 2 个接口。
这一切都是昨天开始的，当时我在这个交换机上升级了软件，然后一切都很好。没有意义。我已经在其他交换机上完成了此升级，但到目前为止没有问题。
C3850#sh int g2/0/1
GigabitEthernet2/0/1 is up, line protocol is up (connected)
Hardware is Gigabit Ethernet, address is 1c1d.86a9.3501 (bia 1c1d.86a9.3501)
Description: coreSW_1_W_1of4_p
MTU 1500 bytes, BW 1000000 Kbit/sec, DLY 10 usec,
reliability 255/255, txload 36/255, rxload 25/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 1000Mb/s, media type is 10/100/1000BaseTX
input flow-control is off, output flow-control is unsupported
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:11, output never, output hang never
Last clearing of "show interface" counters never
Input queue: 0/2000/0/0 (size/max/drops/flushes); Total output drops: 133157273
Queueing strategy: fifo
Output queue: 0/40 (size/max)
5 minute input rate 100659000 bits/sec, 61038 packets/sec
5 minute output rate 144390000 bits/sec, 76852 packets/sec
3445318149 packets input, 715126259616 bytes, 0 no buffer
Received 827824 broadcasts (666658 multicasts)
0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog, 666658 multicast, 0 pause input
0 input packets with dribble condition detected
4521665906 packets output, 1080744400610 bytes, 0 underruns
133157273 output errors, 0 collisions, 1 interface resets
0 unknown protocol drops
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier, 0 pause output
0 output buffer failures, 0 output buffers swapped out
柜台：
C3850#sh int g2/0/1 counters
Port InOctets InUcastPkts InMcastPkts InBcastPkts
Gi2/0/1 718020111847 3459023952 668522 161527
Port OutOctets OutUcastPkts OutMcastPkts OutBcastPkts
Gi2/0/1 1084965964251 4539489816 109940 86365
统计：
C3850#sh int g2/0/1 stats
GigabitEthernet2/0/1
Switching path Pkts In Chars In Pkts Out Chars Out
Processor 10458 2249522 0 0
Route cache 0 0 18985 2870366
Total 10458 2249522 18985 2870366
编辑：
我们在链接上的总利用率为 400Mbps，我看到所有链接单独使用约 100 Mbps（这里和那里的几个字节）。
我在网络上没有看到任何性能问题。此中继连接到其他交换机，并且它们也运行相同的速度接口 4x1G。我已经用相同的软件升级了多个交换机，它们都工作正常，没有任何接口错误。