Routing CISCO Packet Tracker

 

Routing Protocols and

Concepts

General Role of the Router

§ Functions of a Router

    – Best Path Selections

    – Forwarding packets to destination

§ Introducing the Topology

    – 3 1800 series routers connected via WAN links
   – Each router connected to a LAN represented by a switch and      a PC

 

§ Connections of a Router for WAN

      – A router has a DB-60 port that can support 5 different cabling

         standards

§ Connections of a Router for Ethernet

      – 2 types of connectors can be used: Straight through and

         Cross-over

      • Straight through used to connect:

      – Switch-to-Router, Switch-to-PC, Router-to-Server,

         Hub-to-PC, Hub-to-Server

      • Cross-over used to connect:

      – Switch-to-Switch, PC-to-PC, Switch-to-Hub, Hub-to-

         Hub, Router-to-Router
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Interfaces

§ Examining Router Interfaces

       – Show IP router command – used to view routing table

       – Show Interfaces command – used to show status of an

           interface

       – Show IP Interface brief command – used to show a portion of

           the interface information

       – Show running-config command – used to show configuration

           file in RAM

§ Configuring an Ethernet interface

      – By default all serial and Ethernet interfaces are down

      – To enable an interface use the No Shutdown command

§ Verifying Ethernet interface

      – Show interfaces for fastEthernet 0/0 – command used to show

         status of fast Ethernet port

      – Show ip interface brief

      – Show running-config

§ Ethernet interfaces participate in ARP

 

§ Configuring a Serial interface

     – Enter interface configuration mode

     – Enter in the ip address and subnet mask

     – Enter in the no shutdown command

§ Example:

     – R1(config)#interface serial 0/0

     – R1(config-if)#ip address 172.16.2.1 255.255.255.0

     – R1(config-if)#no shutdown

 

§ Examining Router Interfaces

     – Physically connecting a WAN Interface.

     – A WAN Physical Layer connection has sides:

        • Data Circuit-terminating Equipment (DCE) – This is the

           service provider. CSU/DSU is a DCE device.

        • Data Terminal Equipment (DTE) – Typically the router is

           the DTE device.

§ Configuring serial links in a lab environment

     – One side of a serial connection must be considered a DCE.

     – This requires placing a clocking signal – use the clock rate

        command.

     – Example:

• R1(config)#interface serial 0/0

• R1(config-if)#clockrate 64000

      – Serial Interfaces require a clock signal to control the timing of

         the communcations.

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