Router ConfigurationRouter Configuration

Configuring interfacesConfiguring interfaces

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

Router InterfacesRouter Interfaces typestypes

– serial; parallelserial; parallel– most common router set-up has 2 of most common router set-up has 2 of

eacheach

comparisonscomparisons

designation designation – S0,S1; E0,E1S0,S1; E0,E1

communication communication – 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

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

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

Task 1 -Task 1 -

Assign network addressesAssign network addresses– each interface has a unique each interface has a unique

network addressnetwork address– address must match remoteaddress must match remote

CLI command to assign network CLI 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

Task 2Task 2

define encapsulation typedefine encapsulation type PPP most widely used encapsulation PPP 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 encapsulation CLI command to define encapsulation type istype is

– RouterRouter (config-if)#encapsulation ppp (config-if)#encapsulation ppp

Task 3Task 3

– Define bandwidthDefine bandwidthsets data transfer rate of WAN linksets data transfer rate of WAN link

used by link-state routing protocols used by link-state routing protocols for path determinationfor path determination

– CLI command to define CLI command to define bandwidth is bandwidth is

– RouterRouter (config-if)#bandwidth (config-if)#bandwidth NNNNNNNNNN

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 interface access-groups implemented on interface

basisbasis

– CLI command to assign an access-group CLI command to assign an access-group isis

– RouterRouter (config-if)#ip access-group nnn (config-if)#ip access-group nnn (in/out)(in/out)

Finally..Finally..

Remember “no shutdown”Remember “no shutdown”

Brings interface into service once Brings interface into service once configuration completeconfiguration complete