思科交换机根据MAC/IP地址查找对应端口

　　假设对端的MAC地址为：192.168.1.101

　　在中心交换机（核心层交换机或汇聚层交换机）上输入:

switch-6509#show ip arp | in 192.168.1.101
Internet  192.168.50.47           2   0011.2233.4455  ARPA   Vlan50

　　在ARP表中我们找到了和192.168.1.101对应的MAC地址，如果要根据MAC地址查找对应交换机端口，可从下面开始操作。

switch-6509#show mac address-table | in 0011.2233.4455

Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
120    0011.2233.4455    DYNAMIC     Gi1/0/3
Total Mac Addresses for this criterion: 1

　　可以在MAC地址表中发现MAC地址0011.2233.4455是从端口G1/0/3学习过来的，继续向下层排查。

switch-6509#show cdp nei g1/0/3 detail

Device ID: IDC-2960G48-A14-114
Entry address(es):
IP address: 192.168.1.102
Platform: cisco WS-C2960G-48TC-L,  Capabilities: Switch IGMP
Interface: GigabitEthernet1/0/3,  Port ID (outgoing port): GigabitEthernet0/48
Holdtime : 120 sec

Version :
Cisco IOS Software, C2960 Software (C2960-LANBASEK9-M), Version 12.2(50)SE5, REL
EASE SOFTWARE (fc1)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2010 by Cisco Systems, Inc.
Compiled Tue 28-Sep-10 13:44 by prod_rel_team

advertisement version: 2
Protocol Hello:  OUI=0x00000C, Protocol ID=0x0112; payload len=27, value=0000000
0FFFFFFFF010221FF000000000000B8BEBF549D00FF0000
VTP Management Domain: ''
Native VLAN: 1
Duplex: full
Management address(es):
IP address: 192.168.1.102

　　我们发现下层连接的是2960的接入层交换机，登陆到此交换机。

switch-2960#show mac address-table | in 0011.2233.4455

Mac Address Table
-------------------------------------------

Vlan    Mac Address       Type        Ports
----    -----------       --------    -----
120    0011.2233.4455    DYNAMIC     Fa1/0/30
Total Mac Addresses for this criterion: 1

　　即可发现该MAC/IP地址所对应的端口是2960交换机的f1/0/30口，若继续通过跳线追查可以发现该用户的具体位置。

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