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1. Router ConfigurationRouter Configuration
Configuring InterfacesConfiguring Interfaces

2. Configuration categoriesConfiguration categories
Global configuration modeGlobal configuration mode
– parameters set apply to all interfacesparameters set apply to all interfaces
Interface configurationInterface configuration
– sets parameters for selected interfacesets parameters for selected interface

3. Router InterfacesRouter Interfaces
typestypes
– serial; parallelserial; parallel
– most common router set-up has 2 of eachmost common router set-up has 2 of each

4. comparisonscomparisons
designationdesignation
– S0,S1; E0,E1S0,S1; E0,E1
communicationcommunication
– serial to WAN, parallel to LANserial to WAN, parallel to LAN
data ratesdata rates
– serial range 10’s kbit/s to 2Mbit/sserial range 10’s kbit/s to 2Mbit/s
– Parallel range 10/100Mbit/s common,Parallel range 10/100Mbit/s common,
Gigabit increasingly usedGigabit increasingly used

5. considerationsconsiderations
data rate differentialdata rate differential
– Gigabit WAN link unlikelyGigabit WAN link unlikely
bandwidth v costbandwidth v cost
– LAN bandwidth not usually an issueLAN bandwidth not usually an issue
– WAN bandwidth costlyWAN bandwidth costly

6. Configuration tasks -Configuration tasks -
Serial portSerial port
Task 1) - assign network addressTask 1) - assign network address
Task 2) - define encapsulation typeTask 2) - define encapsulation type
Task 3) - define bandwidthTask 3) - define bandwidth
Task 4) - assign ACL’sTask 4) - assign ACL’s

7. Task 1 -Task 1 -
Assign network addressesAssign network addresses
– each interface has a unique networkeach interface has a unique network
addressaddress
– address must match remoteaddress must match remote
CLI command to assign networkCLI command to assign network
address isaddress is
– RouterRouter (config-if)#ip address(config-if)#ip address
nnn.nnn.nnn.nnn sss.sss.sss.sssnnn.nnn.nnn.nnn sss.sss.sss.sss

8. Task 2Task 2
define encapsulation typedefine encapsulation type
PPP most widely used encapsulationPPP most widely used encapsulation
– ppp, replacing slip as standard serial line
protocol; can encapsulate chap/pap
– slip uses PAP encapsulation, less secure
than CHAP
– CLI command to define encapsulationCLI command to define encapsulation
type istype is
– RouterRouter (config-if)#encapsulation ppp(config-if)#encapsulation ppp

9. Task 3Task 3
– Define bandwidthDefine bandwidth
sets data transfer rate of WAN linksets data transfer rate of WAN link
used by link-state routing protocols forused by link-state routing protocols for
path determinationpath determination
– CLI command to define bandwidth isCLI command to define bandwidth is
– RouterRouter (config-if)#bandwidth(config-if)#bandwidth NNNNNNNNNN

10. Task 4Task 4
– Assign ACL’sAssign ACL’s
can permit or deny specific users,can permit or deny specific users,
protocols, directionsprotocols, directions
ACL’s created in Global config modeACL’s created in Global config mode
access-groups implemented on interfaceaccess-groups implemented on interface
basisbasis
– CLI command to assign an access-CLI command to assign an access-
group isgroup is
– RouterRouter (config-if)#ip access-group nnn(config-if)#ip access-group nnn

11. Finally..Finally..

12. Remember “no shutdown”Remember “no shutdown”
Brings interface into service onceBrings interface into service once
configuration completeconfiguration complete