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New Member

Network Monitoring with 3548 switch

Network Pros,

I need some advice here. I run a product called Surfcontrol and SMS Network Monitor which require the NIC to go to promiscuous mode.

Since they moved me to the new Cisco 3548, this no longer works. I don't see any traffic in either application. Our consultants said that this is how the 3548 functions (compared to our Dec hubs) and there's no way around it.

Is this true? I thought it may be a config issue but I'm a PC/Server geek, not a network guy/gal ;-)

Any help appreciated.....Joe

New Member

Re: Network Monitoring with 3548 switch


On a switch things are a bit different when trying to use a network analyzer. You will need to configure the port you have the Network Monitor connected to configured to be a SPAN (Swith Port ANalyzer) port. In the 35xx series, that is done in configuration, under the interface:

conf t

int f0/1

port monitor vlan 1

This will allow port fastethernet0/1 to see all traffic on VLAN 1. If you type in "port monitor ?", you will get all options for the port monitor command.

Use "no" in front of command to turn this feature off.



New Member

Re: Network Monitoring with 3548 switch

Heh....That did it! I'lll have to tell the consultant how it's done ;-)


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