This is a pretty open question so I'll try to go with just recommending what we use. We've run Compuware NetworkVantage for a few years and love it. It works as a probe and can be wired of a monitoring port on a switch. It will summarize all data sent and received into reports you can customize. We found this valuable when assessing whether a bandwidth increase was required. You can find info on it at:
If you're looking for an open-source solution... look into the use of NetFlow capturers/parsers. There's a variety of free ones that will get the job done if you're on a tight/non-existant budget. Anything else I can help with let me know.
[toc:faq]The ProblemOn traditional switches whenever we have a trunk
interface we use the VLAN tag to demultiplex the VLANs. The switch needs
to determine which MAC Address table to look in for a forwarding
decision. To do this we require the switch to do...
[toc:faq]Introduction:Netdr is a tool available on a RSP720, Sup720 or
Sup32 that allows one to capture packets on the RP or SP inband. The
netdr command can be used to capture both Tx and Rx packets in the
software switching path. This is not a substitut...
IntroductionOSPF, being a link-state protocol, allows for every router
in the network to know of every link and OSPF speaker in the entire
network. From this picture each router independently runs the Shortest
Path First (SPF) algorithm to determine the b...