Tài liệu ISDN and DDR pptx

ISDN & DDR

Key Commands Shows and Debugs

interface BRI0
no ip address
encapsulation ppp
no ip mroute-cache
dialer pool-member 1
isdn switch-type basic-dms100
isdn spid1 31787618460101 8761846
isdn spid2 31787618480101 8761848
ppp authentication chap
ppp multilink
interface Dialer1
ip address 146.84.131.241 255.255.255.0
no ip directed-broadcast
ip nat outside
encapsulation ppp
dialer remote-name indy-as5300
dialer idle-timeout 3600
dialer string 5547499
dialer load-threshold 25 either
dialer pool 1
dialer-group 1
ppp authentication chap
ppp multilink
Show isdn stat
Show dialer (for idle timers)
Show int dialer X
Show show int bri 0:1 or 0:2

Show snapshot

Debug isdn q931
Debug isdn q921
Debug ppp nego
Debug ppp authentication
Debug dialer (encaps failed? Check dialer map)
Debug snapshot
Debug dialer events
Debug dialer packet

Additional Commands
Spot The Issue Notes
Username r1 password r1pass
Ppp chap hostname new_host (used for two dialers to
same location, when one dialer interface is a
“backup interface” for IP and second is FFR for
EIGRP or Appletalk)

Ip ospf demand-circuit (for hello suppression)

Map-class dialer mapname
Dialer isdn speed 56
Then
Dialer string 5551212 class mapname

Interface serial 0
Backup interface dialer 0
Backup delay 5 30 (sec bef activat. sec bef teardo
Backup load <enable load> <disable load>

Load is /255, can also use keywork “never”

Snapshot routing on client side:
Dialer map snapshot 60 5551212
Snapshot client 5 1200 spress-state-change dialer
Or Snapshot client 5 1200 dialer (active & quiet
time) Server:
Snapshot server <active time> dialer

Callback, server:
dialer callback-secure
dialer enable-timeout 2
ppp callback accept
dialer map ip 7.1.1.8 name atlanta class dial1 555..
map-class dialer dial1
dialer callback-server username

on client:
ppp callback request

Make sure you have BROADCAST in ALL your dialer
map statements. This goes for frame-relay too!

Remember “ip ospf demand-circuit” when dealing
with ospf

When using backup interface, activating the
backup only makes the dialer interface go from
standby to active. Something else (such as an
ospf hello or interesting traffic) has to

initiate the call.

When configuring dial backup, a physical serial
interface is considered "down" when carrier is
lost. A point-to-point SUB interface is
considered down when it loses the DLCI it is
attached to via "interface-dlci".

Encaps ppp and ppp authentication chap have to be
on BOTH the physical BRI interface AND the
virtual dialer interfaces

If asked for one way authentication, use the “ppp
authetication chap CALLIN” keyword.

Remember the dialer-pool and pool member link!

For calling party, remote name is irrelevant.
For called party, remote name is essential

Put all password the same to save time and worry

Do snapshot routing with legacy DDR, not dialer
interfaces cuz code is buggy

Snapshot routing only for RIP and IGRP
Make calling router the snapshot client