What is router Initialization Process? Router initialization process consists of various sub-processes that range...
from POST to bringing the interfaces up. As soon as you power on a router it runs a POST to see if all modules inserted are responding to power ok signal or not. Once that is done it looks for the OS in ROM and Depending upon the configuration register setting it will get the IOS and configuration file else the router goes onto rommon mode for further troubleshooting.
Once it gets the configuration file either from NVRAM or from a TFTP server it knows which IP address/mask to be assigned to what interfaces, access0lists and what is the routing protocol. Based upon this information it starts sending updates to its interfaces and builds the routing table.
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