Dell Force10 MXL Blade MXL 10/40GbE Switch IO Module Configuration Guide - Page 387

21 Port Monitoring Port monitoring is a feature that copies all incoming or outgoing packets on one port and forwards (mirrors) them to another port. The source port is the monitored port (MD) and the destination port is the monitoring port (MG). Port monitoring functionality is different between platforms, but the behavior is the same, with highlighted exceptions. This chapter contains the following sections: • Important Points to Remember • Port Monitoring • Configuring Port Monitoring Important Points to Remember • Port monitoring is supported on physical ports only; virtual local area network (VLAN) and port-channel interfaces do not support port monitoring. • The monitored (source, MD) and monitoring ports (destination, MG) must be on the same switch. • In general, a monitoring port should have no ip address and no shutdown as the only configuration; FTOS permits a limited set of commands for monitoring ports. To display these commands, use the command ?. • A monitoring port also may not be a member of a VLAN. • There may only be one destination port in a monitoring session. • A source port (MD) can only be monitored by one destination port (MG). If you try to assign a monitored port to more than one monitoring port, the following error is displayed (Message 1). Message 1 Assign a Monitored Port to More than One Monitoring Port FTOS(conf)#mon ses 1 FTOS(conf-mon-sess-1)#source tengig 0/0 destination tengig 0/60 direction both FTOS(conf-mon-sess-1)#do show mon ses SessionID Source Destination Direction Mode Type --------- ------ ----------- --------- ---- ---- 1 Port-based TenGig 0/0 TenGig 0/60 both interface FTOS(conf-mon-sess-1)#mon ses 2 FTOS(conf-mon-sess-2)#source tengig 0/0 destination tengig 0/61 direction both % Error: MD port is already being monitored. Port Monitoring | 385