What does the IOS ROMMON software (for a switch) do compared to the regular IOS or Cat image? Does an IOS ROMMON image allow you to run the switch without any images in the flash? I have always wondered why the ROMMON's (on routers) have a version number similar to an IOS version number but yet the functionality of the ROMMON is limited to only a few commands. Can someone explain why you would have an IOS ROMMON image??? Just a question I have long wanted answered.
The rommon is needed for maintenance purposes, such as password recovery, TFTP downloads in cases where the flash file is corrupt or you dont have access to regular router mode. Can also be used for doing diagnostic tests.
I understand all of this but I want to know why Cisco calls it an "IOS ROMMON" image if it only contains basic commands to load flash and to boot the device. Calling it IOS implies to me that it has the same functionality as an IOS software image. The IOS ROMMON doesn't have these capabilities. Why the name IOS ROMMON???
[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...