D'oh - you're right. I was thinking packet capture and you asked about packet tracer. I know that tool also.
Unfortunately there's no similar cli (or GUI-based) tool on IOS. There are some other Cisco Live presentations that describe how traffic is processed in general (physical interface, ASIC, EARL, CPU etc.) on some of the more widely deployed platforms but nothing that gives you the blow-by-blow for a given packet through your router or switch and runs on the live box.
[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...