Just to reword what plumbis000 noted, some of the latest IOS versions are not available for some older platforms. E.g. don't believe 12.4 is available for the 2500 series.
Also as plumbis000 noted, resource requirements, and their differences between versions, should be noted. E.g. 2500 IP only, ver. 12.3 IP only, 12 MB RAM and 16 MB flash; 12.0 IP only, 6 MB RAM and 8 MB flash.
[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...