Monitoring a VLAN

darren-carr · ‎04-23-2009

Guys

At present I use OP Manager to monitor my LAN. Sadly at present we have a very flat LAN in a single VLAN. I am looking at splitting up the LAN into multiple VLANs. I can easily route between the VLANs this has been tested. What I would like to do is to benchmark the current VLAN utilisation for broadcasts, multicasts, etc... start to migrate servers to the new VLANs and then benchmark again once I have finished. I can't really do this with OP Manager. Does anyone have any experience of using other tools to capture and model this data.

Thanks

Darren

plumbis · ‎04-24-2009

Depending on your switch models you can try to configure either SPAN sessions (http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008015c612.shtml) or VACL captures (http://www.cisco.com/en/US/tech/tk389/tk814/technologies_configuration_example09186a00808122ac.shtml)

ropethic · ‎04-27-2009

If you able to set up a span session, then make the source port the entire vlan.

For tools I would recommend Wireshark (ethereal) protocol analyzer. It is a free protocol analyzer you can use to monitor your traffic within the vlan.

www.wireshark.com