由于该端口连接到另一台交换机或HUB,必须继续追查，方法如下:
6509SE (enable) show cdp nei 3/11
* - indicates vlan mismatch.
# - indicates duplex mismatch.
Port Device-ID Port-ID Platform
3/11 Cisco2924 GigabitEthernet1/1 cisco WS-C2924M-XL
该命令显示对端设备是一台Cisco2924，如果没有显示，那么说明连接的是别的厂家的设备，可能要到该交换机上用类似的办法继续追查。本例子中是Cisco 设备，所有我们可以继续:
6509SE (enable) show cdp nei 3/11 de
Port (Our Port): 3/11
Device-ID: Cisco2924
Device Addresses:
IP Address: 10.10.0.60
Holdtime: 153 sec
Capabilities: TRANSPARENT_BRIDGE SWITCH
Version:
Cisco Internetwork Operating System Software
IOS (tm) C2900XL Software (C2900XL-C3H2S-M), Version 12.0(5.2)XU,
MAINTENANCE INTERIM SOFTWARE
Copyright (c) 1986-2000 by cisco Systems, Inc.
Compiled Mon 17-Jul-00 17:35 by ayounes
Platform: cisco WS-C2924M-XL
Port-ID (Port on Neighbors's Device): GigabitEthernet1/1
VTP Management Domain: lan
Native VLAN: 1
Duplex: full
System Name: unknown
System Object ID: unknown
Management Addresses: unknown
Physical Location: unknown
Cisco2924#show mac-address-table dynamic address 0009.6b8c.64ec
Non-static Address Table:
Destination Address Address Type VLAN Destination Port
------------------- ------------ ---- --------------------
0009.6b8c.64ec Dynamic 2 FastEthernet0/2
Cisco2924#show mac-address-table dynamic interface f0/2
Non-static Address Table:
Destination Address Address Type VLAN Destination Port
------------------- ------------ ---- --------------------
0009.6b8c.64ec Dynamic 2 FastEthernet0/2
通过以上命令可知，MAC地址0009.6b8c.64ec 与Cisco 2924交换机相连，且是该端口上唯一活动的MAC地址，所以IP为10.10.1.250的机器应该就连接在这个端口上。
