端口镜像可用于在另一个端口上监视特定端口的数据包。以下示例显示了如何将端口 25 上的所有传入数据包镜像到端口 26。
有关此任务的拓扑,请参见Basic SEFOS Topology。在 SEFOS-1 交换机上键入以下命令。
请参见Connect to SEFOS。
SEFOS-1# configure terminal SEFOS-1(config)# interface vlan 1 SEFOS-1(config-if)# shutdown SEFOS-1(config-if)# ip address 12.0.0.1 255.0.0.0 SEFOS-1(config-if)# no shutdown SEFOS-1(config-if)# end
SEFOS-1# ping 12.0.0.100 Reply Received From :12.0.0.100, TimeTaken : 60 msecs Reply Received From :12.0.0.100, TimeTaken : 100 msecs Reply Received From :12.0.0.100, TimeTaken : 90 msecs --- 12.0.0.100 Ping Statistics --- 3 Packets Transmitted, 3 Packets Received, 0% Packets Loss
端口 26 未捕获主机 A 对交换机的 ping 回复,该端口在配置端口镜像之前连接到数据包捕获设备。
SEFOS-1# configure terminal
SEFOS-1(config)# monitor session destination interface xl-ethernet 0/26
SEFOS-1(config)# monitor session source interface xl-ethernet 0/25 rx
SEFOS-1(config-if)# end
SEFOS-1# show port-monitoring Port Monitoring is enabled Monitor Port : X10/26 Port Ingress-Monitoring Egress-Monitoring ---- ------------------ ----------------- X10/25 Enabled Disabled ...
SEFOS-1# ping 12.0.0.100
# tcpdump -xx -n -i eth3 icmp ... listening on eth3, link-type EN10MB (Ethernet), capture size 96 bytes 17:09:58.595583 IP 12.0.0.100 > 12.0.0.1: ICMP echo reply, id 0, seq 1, length 40 ... 0x0010: 003c 68e6 4000 ff01 fa75 0c00 0064 0c00 17:09:58.617899 IP 12.0.0.100 > 12.0.0.1: ICMP echo reply, id 0, seq 2, length 40... 0x0030: a5a5 a5a5 a5a5 a5a5 a5a5 a5a5 a5a5 a5a5 17:09:58.698280 IP 12.0.0.100 > 12.0.0.1: ICMP echo reply, id 0, seq 3, length 40...