05-25-2007 03:30 AM - edited 03-03-2019 05:08 PM
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?
05-31-2007 10:57 AM
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
05-31-2007 12:49 PM
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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