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Router configuration mode

As explained in Acing the CCNA Exam: Volume 1 Fundamentals and Protocols

Router configuration mode is a Cisco IOS CLI state in which routing-protocol configuration commands can be entered for a router process.

Router configuration mode is a Cisco IOS CLI state for configuring a routing-protocol process. Enter it from global configuration mode with router ospf process-id. section 17.4

Use router configuration mode to configure the network command, which:

  • Finds interfaces whose IP addresses fall within the specified range. section 17.5
  • Activates the routing protocol on matching interfaces. section 17.5
  • Advertises the interfaces’ network prefixes to neighbors. section 17.5

Entering the mode and activating OSPF

R1(config)# router ospf 1 R1(config-router)# network 192.168.1.0 0.0.0.7 area 0 R1(config-router)# network 192.168.2.1 0.0.0.0 area 0 The config-router prompt identifies router configuration mode. The first network command can match multiple interfaces; the second matches one exact address. section 17.4

How Acing the CCNA Exam: Volume 1 Fundamentals and Protocols covers it

How deep it goes
Defines entry and purpose, demonstrates network commands, and defers multiple OSPF processes and detailed OSPF configuration.
Examples
Demonstrates OSPF commands matching several interfaces or one exact interface through wildcard masks.
What it assumes
Assumes familiarity with global configuration mode and interface IP addressing while defining routing-process configuration from the CLI.
What you can do after
Operate/configure OSPF by entering router configuration mode and applying network commands to selected interfaces.
How it connects
Connects global configuration mode with OSPF, RIP, EIGRP, the network command, wildcard masks, and dynamic routing.
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