技术广场：两条思科交换机的设置与技巧
欢迎进入网络技术社区论坛，与200万技术人员互动交流 >>进入 在一个Cisco 交换网络中间，已知某台机器的IP地址，如何找出它连接到了哪台交换机的哪个端口上呢？最方便快捷的方法使使用CiscoWorks 2000 LMS网管软件的User tracking 功能，图形化界面，一目了
欢迎进入网络技术社区论坛，与200万技术人员互动交流 >>进入
在一个Cisco 交换网络中间，已知某台机器的IP地址，如何找出它连接到了哪台交换机的哪个端口上呢？最方便快捷的方法使使用CiscoWorks 2000 LMS网管软件的User tracking 功能，图形化界面，一目了然。
如果没有这个软件，也可以使用以下手工分析方法来找出答案。
示例网络：核心交换机为6509（交换引擎SE用CatOS， MSFC运行IOS软件）
1. 找出该IP所对应的MAC地址：
通过查看系统的ARP缓存表可以找出某IP所对应的MAC地址。由于ARP不能跨VLAN进行，所以连接各个VLAN的路由模块MSFC就是最佳的选择――一般它在每一个VLAN都有一个端口（interface vlan n），能正确地进行ARP解释。
6509MSFC#ping 10.10.1.65
Type escape sequence to abort.
Sending 5， 100-byte ICMP Echos to 10.10.1.65， timeout is 2 seconds：
Success rate is 100 percent （5/5）， round-trip min/avg/max = 1/1/4 ms
6509MSFC#show arp | in 10.10.1.65
Internet 10.10.1.65 2 0006.2973.121d ARPA Vlan2
通过以上命令，我们知道10.10.1.65的MAC地址是0006.2973.121d， 这是IOS设备的MAC地址表达方式，在CatOS中，应写为00-06-29-73-12-1d.
2.在交换机上找出MAC地址所对应的端口
6509SE> （enable） show cam 00-06-29-73-12-1d
* = Static Entry. + = Permanent Entry. # = System Entry. R = Router Entry.
X = Port Security Entry $ = Dot1x Security Entry
VLAN Dest MAC/Route Des [CoS] Destination Ports or VCs / [Protocol Type]
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