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Section 4
Configuring Router Interfaces
The Cisco 2500 routers that you will be working with will have three interfaces that you must configure in order for it to switch packets to those interfaces for transport. You will have to configure two serial interfaces and one ethernet.
There are a few things that you need to know in order to configure the interface:
- The IP Address that needs to be assigned to the interface
- The subnet that each interface will be on.
- The network address of each subnet for the routing protocol (You will be configuring RIP).
- The subnet mask for the network.
- The network between the router is cabled correctly according to your physical topoplogy.
The serial interfaces MUST be cabeled correctly. See Router Setup section to see how they must be cabeled. The S0, the transmitting serial interface (DCE), is configured differently from the S0 interface, the receiving interface (DTE).
Configuring S0
- Get into Global Configuration Mode
- Configure the interface by typing the interface s0 command.
- Configure the IP address by using the ip address xxx yyy command, where xxx is your IP address and yyy is your subnet mask.
- Next you must set the clockrate, or transmission speed, of the serial port to 56000Kb by using the clockrate 56000 command.
Configuring S1 and E0
- Type exit to go back to global configuration mode.
- Switch configuration mode to the proper interface by using the interface e0 (or s0) command.
- Configure the IP Address of the interface by using the interface xxx yyy command.
Now that the intefaces have been configured you must now configure the routing protocol, the protocol that allows the router to learn the addressing tables.
