发布时间：2013-09-25
点击量：7510switch#show interfaces gigabitEthernet 2/1
Index(dec):1 (hex):1
GigabitEthernet 2/1 is UP , line protocol is UP
Hardware is Broadcom 5464 GigabitEthernet //phy 型号
Interface address is: no ip address
MTU 1500 bytes, BW 1000000 Kbit //MTU 带宽
Encapsulation protocol is Bridge, loopback not set
Keepalive interval is 10 sec , //set 链路脉冲
Carrier delay is 2 sec //载波延时，口链路的载波检测信号DCD 从Down 状态到Up 状态的时间延时
如果DCD 在延时之内发生变化，那么系统将忽略这种的状态的变化而不至于上层的数据链路层重新协商
RXload is 1 ,Txload is 1 //接口负载利用率1/255，每5 分钟统计
Queueing strategy: FIFO //这些都是给路由器用的，交换机不应该show 这些信息，目前在新版本10.4（2b2）中已经不显示了。
Output queue 0/0, 0 drops;
Input queue 0/75, 0 drops
Switchport attributes:
interface's description:""
medium-type is copper
lastchange time:5 Day: 7 Hour:47 Minute:40 Second //接口自系统启动后发生link 变化的相对时间，可以结合show ver 查看系统的启动时间，
判断端口上次发生up/down 的时间
Priority is 0
admin duplex mode is AUTO // 配置的双工为auto, oper duplex is Full//实际的双工状态
admin speed is AUTO, oper speed is 1000M // 配置与实际的速率
flow control admin status is OFF,flow control oper status is OFF //流控
broadcast Storm Control is OFF,multicast Storm Control is OFF,unicast Storm
Control is OFF
5 minutes input rate 0 bits/sec, 0 packets/sec // 5 分钟平均值
5 minutes output rate 20523 bits/sec, 9 packets/sec //5 分钟平均值
42388309 packets input, 2917143960 bytes, 0 no buffer, 0 dropped //重点关注no buffer 和droped 统计，no buffer 就是由于缓冲区不足
Received 76899 broadcasts, 0 runts, 1 giants
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 abort
69858478 packets output, 6534138835 bytes, 0 underruns , 116 dropped //重点关注droped 统计
0 output errors, 0 collisions, 0 interface resets
input，output速率虽然是5分钟的平均值，但实际上是5秒钟更新一次，软件模块会5秒钟读取相关MIB并计算最近5分钟的数据然后进行更新。
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