Router%20Configuration

1
Router Configuration

• Configuring interfaces

2
Configuration categories

• Global configuration mode
• parameters set apply to all interfaces
• Interface configuration
• sets parameters for selected interface

3
Router Interfaces

• types
• serial parallel
• most common router set-up has 2 of each

4
comparisons

• designation
• S0,S1 E0,E1
• communication
• serial to WAN, parallel to LAN
• data rates
• serial range 10s kbit/s to 2Mbit/s
• Parallel range 10/100Mbit/s common, Gigabit
  increasingly used

5
considerations

• data rate differential
• Gigabit WAN link unlikely
• bandwidth v cost
• LAN bandwidth not usually an issue
• WAN bandwidth costly

6
Configuration tasks -

• Serial port
• Task 1) - assign network address
• Task 2) - define encapsulation type
• Task 3) - define bandwidth
• Task 4) - assign ACLs

7
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

8
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

9
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

10
Task 4

• Assign ACLs
• can permit or deny specific users, protocols,
  directions
• ACLs 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)

11
Finally..
12
Remember no shutdown

• Brings interface into service once configuration
  complete