CCNA Routing and Switching Lessons 11-12 - WAN Configuration - Eric Vanderburg

1. PPP, ISDN, & Frame Relay
Chapters 11-12
Networking Essentials – Eric Vanderburg © 2005

2. PPP

Interface serial 0
Encapsulation ppp
 Ppp authentication chap

Username CNT password class
 Authentication will succeed if the
password is the same on both ends.

Networking Essentials – Eric Vanderburg © 2005

3. Functions & Reference Points

U reference point always connects to the
ISP on one end

Other end is connected to NT1/TE1 on the
router or NT1 device
 NT1
device uses reference pt S/T to connect to
the router TE1
 NT1 device uses reference pt T to connect to
NT2, NT2 uses S reference pt to connect to the
router TE1. (NT2 is often used with a PBX CPE)
 NT1 device using reference pt S/T connects to
TA, TA uses R reference pt to connect to TE2
Networking Essentials – Eric Vanderburg © 2005

4. ISDN Configuration (BRI)
Isdn switch-type basic-ni1
 Switch types

Basic-Dms100, Basic-ni1, & basic-5ess
(North America)
 Basic-net3 (Europe & UK)
 NTT (Japan)
 Vn3 (France)
 1tr6 (Germany)
 Ts013 (Australia)

Networking Essentials – Eric Vanderburg © 2005

5. ISDN Configuration

Interface bri 0







Isdn spid1 83940293774856
Isdn spid2 93849380964893
Dialer idle-timeout 300 (disconnect after 300)
Dial wait-for-carrier time 20 (wait 20 secs for
response from ISP)
Dialer fast-idle 120
Ppp multilink
Dialer load-threshold 50 either (dial another line if
using 50% capacity)
Networking Essentials – Eric Vanderburg © 2005

6. ISDN Configuration
Dialer-list 1 protocol ip list 101
 Interface bri 0

Dialer-string 14405551212 (always dial this
number)
 Dialer map ip 172.16.2.1 broadcast name
LA 14045967491
 Dialer-group 1

Networking Essentials – Eric Vanderburg © 2005

7. ISDN Configuration (PRI)

Controller t1 1/0

Framing esf (how to interpret frames)
 Sf,

esf, or crc4
Linecode b8zs (encoding – what is 0 &1)
 Ami,


b8zs, or hdb3
Pri-group timeslots 1-24
Interface serial 1/0:23 (last subinterface
representing the D channel)

Configuration similar to BRI
Networking Essentials – Eric Vanderburg © 2005

8. ISDN Configuration
Create an interface for each remote site
 Interface dialer 1

Ip address…
 Encapsulation ppp
 Ppp authentication chap
 Dialer remote-name LA
 Dialer string 172.16.2.1 14045967491
 Dialer-group 1 (defines interesting traffic)
 Dialer pool 3 (BRI lines can be in this)

Networking Essentials – Eric Vanderburg © 2005

9. ISDN Configuration

Interface serial 1/0:0
Encapsulation ppp
 Ppp authentication chap
 Isdn spid 555094830928394
 Dialer pool-member 3

Networking Essentials – Eric Vanderburg © 2005

10. Frame Relay

Interface serial 0
Encapsulation frame-relay
 Frame-relay lmi type ansi (router to switch)

 Ansi,

q933a, or Cisco (Cisco is default)
Frame-relay interface-dlci 50 ietf
 Optional
ietf/cisco (cisco is default. Set to ietf if
using another brand of router)
Networking Essentials – Eric Vanderburg © 2005

11. Frame Relay
If you are not using inverse arp
 Interface serial 0

No frame-relay inverse-arp
 Frame-relay map ip 192.168.0.2 51
broadcast
 (broadcast allows broadcasted routing
updates to be sent unicast to each mapped
router)


Show frame-relay map
Networking Essentials – Eric Vanderburg © 2005

12. Frame Relay


Subinterfaces
Interface serial 0.1 point-to-point



Interface serial 0


Ip address…
Frame-relay interface-dlci 51
Encapsulation frame-relay
Interface serial 0.1 multipoint



ip address…
Frame-relay interface-dlci 51
Frame-relay interface-dlci 52
Networking Essentials – Eric Vanderburg © 2005