1,直连上查看端口信息，得出MAC
IDC-2960G48-B11-103#sh mac address-table interface gi0/36
Mac Address Table
-------------------------------------------
Vlan Mac Address Type Ports
---- ----------- -------- -----
90 001b.fcdd.e4a9 DYNAMIC Gi0/36
Total Mac Addresses for this criterion: 1
2,登录到级联的上联交换机（中心交换）上查询该MAC地址对应的IP信心
IDC-3750G-12S-01>sh ip arp | in 001b.fcdd.e4a9
Internet 192.168.90.15 181 001b.fcdd.e4a9 ARPA Vlan90
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