Secondary keyword has been supported for a long time on HSRP groups. Shouldn't need an ARP entries.Also make sure you need 12.2.8T. That is that you have new hardware that requires it, or need newer features in it. Otherwise, 12.2(10a) mainline is...
If you have used CatOS, Native IOS will take some getting used to. For example, get used to "interface range", and "show port status", "switchport", etc. More complex? Well it is the same as the IOS routers, so the utopian dream is for everything ...
IOS behaves different than CatOS. True "clear config all" did not require a reload. But with IOS devices, there is the notion of the startup and running config. You can only erase the startup-config with a single command "write erase". Clearing t...
