This section briefly introduces how to detect VLAN switches and their port numbers.

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Brief introduction how to detect VLAN switches and their port numbers 15:58:01
Label: Switch detection full-duplex Ethernet Throughput
We use the Cisco Catalyst 5500 switch. The 168 ports of the switch are allocated to a virtual LAN. I configure the SPAN port as the monitoring VLAN and then connect a monitor to the SPAN port. I was surprised that the throughput was very large at that time, and the utilization rate reached 100%. In addition to very high throughput, I have received over-many broadcast storms and repeated transfers. Intranet users did not report any network problems. The following are some suggestions:
 
By ing 168 VLAN ports to one Ethernet port and using a monitor to Monitor throughput, you may have inaccurate opinions on Intranet throughput. The utilization rate you see is the VLAN connected to the SPAN port. the SPAN port may be half-duplex or full-duplex port 10/100 Base-T. In this case, it is observed that the 100% utilization rate will not trigger an alarm, because the switch optical fiber is used to handle the Gigabit throughput, which can easily exceed the speed of the port you are monitoring the throughput.
 
A broadcast storm may be caused by an analysis of all VLANs at a time. Instead, you can use SNMP or remote monitoring (RMON) to monitor the switch and its ports. Try the free SNMP/RMON Monitoring Program for Windows. The software can be obtained at www.compaq.com/support/files/networking/software/Compaq_Network _Management_Software.html. This kind of monitoring program can import information into an Excel table