show interface counters 查看的是从上一次清除计数器之后到当前时间统计的一个数值，是不断累计的，Octets反应的也是累计的字节数（单位byte）,如果要转换为KB那么只需除以1024即可，转换为MB再次除以1024，以此类推
show interface t1/1 中的 xxxx packets input/ packets output 是上面 对应的ucast+mcast+Bcast 的和
TEST-C3560x#sh int t1/1 counters
Port InOctets InUcastPkts InMcastPkts InBcastPkts
Te1/1 57433969236673 179954154943 901404033 109337015
Port OutOctets OutUcastPkts OutMcastPkts OutBcastPkts
Te1/1 273766597900976 272644695974 17117261 17551603
TEST-C3560x#sh int t1/1 | in bytes
MTU 1500 bytes, BW 10000000 Kbit, DLY 10 usec,
180965408293 packets input, 57434203680985 bytes, 0 no buffer
272680110725 packets output, 273767313380298 bytes, 0 underruns
TEST-C3560x#如果需要查看端口实时的流量，可以通过show interface InterfaceName | in rate 查看,这个反应的是该接口的实时流量情况（默认是5分钟的平均值，可以通过接口命令：load-interval 60 进行修改1分钟，单位为秒，也可修改为30-300之间的其他值），数据的单位是bit/sec即bps，如果需要转换为Kb(Kpbs), Mb(Mbps),则需要分别除以一个1000和两个1000来进行转换。
我想你要查看流量，应该是看这一种吧
TEST-C3560x#sh int t1/1 | in rate
Queueing strategy: fifo
5 minute input rate 114545000 bits/sec, 44927 packets/sec ---> 114545 Kbps, 114.545 Mbps
5 minute output rate 563952000 bits/sec, 69844 packets/sec ---> 563952 Kbps, 563.952 Mbps
TEST-C3560x#
附：修改load-interval的 示例
TEST-PoE#sh run int g1/0/1
Building configuration...
Current configuration : 114 bytes
!
interface GigabitEthernet1/0/1
switchport access vlan 10
switchport mode access
spanning-tree portfast
end
TEST-PoE#conf t
Enter configuration commands, one per line. End with CNTL/Z.
TEST-PoE(config)#int g1/0/1
TEST-PoE(config-if)#load-interval ?
<30-600> Load interval delay in seconds
TEST-PoE(config-if)#load-interval 60
TEST-PoE(config-if)#do sh run int g1/0/1
Building configuration...
Current configuration : 132 bytes
!
interface GigabitEthernet1/0/1
switchport access vlan 10
switchport mode access
load-interval 60
spanning-tree portfast
end
TEST-PoE(config-if)#do sh int g1/0/1 | in rate
Queueing strategy: fifo
1 minute input rate 0 bits/sec, 0 packets/sec
1 minute output rate 0 bits/sec, 0 packets/sec
TEST-PoE(config-if)#
ilay
