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Router Configuration. Configuring interfaces. Configuration categories. Global configuration mode parameters set apply to all interfaces Interface configuration sets parameters for selected interface. Router Interfaces. types serial; parallel most common router set-up has 2 of each.

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router configuration

Router Configuration

Configuring interfaces

configuration categories
Configuration categories
  • Global configuration mode
    • parameters set apply to all interfaces
  • Interface configuration
    • sets parameters for selected interface
router interfaces
Router Interfaces
  • types
    • serial; parallel
    • most common router set-up has 2 of each
comparisons
comparisons
  • designation
    • S0,S1; E0,E1
  • communication
    • serial to WAN, parallel to LAN
  • data rates
    • serial range 10’s kbit/s to 2Mbit/s
    • Parallel range 10/100Mbit/s common, Gigabit increasingly used
considerations
considerations
  • data rate differential
    • Gigabit WAN link unlikely
  • bandwidth v cost
    • LAN bandwidth not usually an issue
    • WAN bandwidth costly
configuration tasks
Configuration tasks -
  • Serial port
  • Task 1) - assign network address
  • Task 2) - define encapsulation type
  • Task 3) - define bandwidth
  • Task 4) - assign ACL’s
task 1
Task 1 -
  • Assign network addresses
    • each interface has a unique network address
    • address must match remote
  • CLI command to assign network address is
    • Router (config-if)#ip address nnn.nnn.nnn.nnn sss.sss.sss.sss
task 2
Task 2
  • define encapsulation type
  • 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 type is
    • Router (config-if)#encapsulation ppp
task 3
Task 3
  • Define bandwidth

sets data transfer rate of WAN link

used by link-state routing protocols for path determination

  • CLI command to define bandwidth is
  • Router (config-if)#bandwidth NNNNN
task 4
Task 4
  • Assign ACL’s
    • can permit or deny specific users, protocols, directions
    • ACL’s created in Global config mode
    • access-groups implemented on interface basis
  • CLI command to assign an access-group is
  • Router (config-if)#ip access-group nnn (in/out)
remember no shutdown
Remember “no shutdown”
  • Brings interface into service once configuration complete