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 10’s 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 ACL’s

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 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

11. Finally..

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