Cisco TAC has put together a list of router issues that are commonly perceived to be due to a hardware failure, but can normally be fixed more quickly without replacing anything. While some of these may in fact be due to hardware failures, it doesn't usually make sense to start with that assumption. Save yourself some time by checking more common causes first.
#4 A module or interface card is unrecognized. If the IOS version is too new, or the hardware is otherwise unsupported by the software, modules may not be seen. This is almost always a mismatch between the software required and the hardware installed.
In additional, failure to save the configuration after a change is also fairly common.
#6 Errors reported in show interface output. Most errors are either normal, but unusual conditions (drops, e.g.) or due to an external cause like incorrect clocking, noise, or even a marginal cable. Rule those out first.
#7 Wrong version loaded, or failure to completely boot. Again, the config-register can easily cause unexpected behavior. Check the config-register and boot system commands, and beware of relying on the system to boot the first image in flash.
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Before the upgrade, I was able to SSH into a level 15 user and it would land me directly to # without using enable. After upgrading to from 16.3.8 to 16.9.4, my level 2 account can still SSH in but level 15 user account gets % login invalid. So I try...
What design is generally recommended for an office with approx 400 client devices. We have about 10 x access L2 switches (2960x) and are not sure whether to go with 1 x L3 stack (4 x 9300 switches) or maybe 2 x stacks (of 2 x 9300 switches). We are thinki...
After I create a VLAN i can no longer access the GUI.port 1 - trunk connected to routerport 2 - access, PCThe switch is connected to an Edgerouter.I'm sure it's something simple, but I'm new to VLANs and can't figure it out.