2）使能基于端口的防攻击功能（默认使能），通过display auto-port-defend configuration命令查看回显信息，“Auto-port-defend”字段显示“enable”。
[CSS] display auto-port-defend configuration
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Name : default
Related slot : <1/7-1/8,2/7-2/8,1/9>
Auto-port-defend : enable
Auto-port-defend sample : 5
Auto-port-defend aging-time : 300 second(s)
Auto-port-defend arp-request threshold : 120 pps(enable)
Auto-port-defend arp-reply threshold : 120 pps(enable)
Auto-port-defend dhcp threshold : 120 pps(enable)
Auto-port-defend icmp threshold : 120 pps(enable)
Auto-port-defend igmp threshold : 120 pps(enable)
Auto-port-defend ip-fragment threshold : 30 pps(enable)
Auto-port-defend alarm : disable
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