isdn pri

Unanswered Question
May 25th, 2007
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i had a cisco 3845 router,it is central router. i was took a isdn pri E1 line, it was the backup of leased line E1.

i had connected 30 branches(cisco-1841) via ch-E1 64Kbps speed backup of isdn bri.

how to configure my central and branch router isdn lines with DDR?

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drolemc Thu, 05/31/2007 - 10:57
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DDR provides network connections across the Public Switched Telephone Network (PSTN). Traditionally, networks have been interconnected using dedicated lines for wide-area network (WAN) connections. With DDR, you can use modems, Integrated Service Data Network (ISDN) terminal adapters (TAs), or integrated ISDN capabilities to establish low-volume, periodic network connections over public circuit-switched networks. You can also establish dial-up connections over X.25 or Frame Relay packet-switched networks by using LAPB, X.25, or Frame Relay encapsulations.


The following protocols can be routed over DDR: AppleTalk, Banyan VINES, CLNS, DECnet, IP, IPX, and XNS


Refer the following URL for more information

http://www.cisco.com/en/US/tech/tk801/tk133/tech_configuration_guides_list.html

smothuku Thu, 05/31/2007 - 12:49
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Hi Raj ,


Can you confirm me like you have 30 branches in differnet locations with isdn bri as a back up for leased line.


How is the setup.


Is it like below.


3845 -----(1841)branch 1

|

-------- (1841)branch 2

--------- (1841)brach 30..


username router1 password XXXX

...

...

...

username Router 30 password XXXX



3845 config:


controller e1 X/X

framing crc4

linecode hdb3

pri-group timeslots 1-31


**Range is from 1 to 31.



interface serial slot/port:23

encapsulation ppp

dialer-group 1

dialer pool-member 1

ppp authentication chap


Create 30 dialer interafaces for 30 branches.


Int di1

ip address XXXX

encapsulation ppp

dialer-group 1

dialer remote-name router1

dialer idle-timeout 300

dilaer load-threshold 120 either.

dialer caller XXXX (isdn no of Branch 1)

dialer pool 1

ppp authentication chap

ppp chap password XXXX

ppp chap hostname XXXX (3845 hostname )

ppp multilink

dialer-list 1 protocol ip permit.

...

...

...

...


int di30

.

.

.



brach router 1



username XXXXX(3845 router name) password XXXX


int serial 0

ip add XXXX

backup delay 5 120

backup interface bri0


int bri0

ip add XXXX

encapsulation ppp

dialer-group 1

dialer string XXXX (Pri no -3845)

isdn switch-type XXXX

ppp authentcation chap

ppp chap password XXXX

ppp chap hostname XXXX (brach router name)

ppp multilink



dialer-list 1 protocol ip permit.


Note: As soon serial interface of brach router goes down isdn will be activated within 5 secons.as soon as serail link comes up isdn will be disconnected after 120 secons.


Brach 2

.

.

.

brach 3

.

.

.

.

brach 30

.

.

.

.



Thanks,

satish




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