ISDN PRI

[Sureshdank]

Can anybody please help me in configuring ISDN PRI E1 line.

I am using this link as backup for E1 leased line.

Thanks in Advance

Suresh

[spremkumar]

Hi Suresh

You need to do the controller configs with necessary signaling used in your region and the bandwidth you are gonna allocate for each channel.

Once you are done with the config you need to do the serial interface config with necessary dialout config so that it can dial out in case your primary link goes down.

Do refer this link to get started..

http://www.cisco.com/en/US/products/sw/iosswrel/ps1831/products_configuration_guide_chapter09186a00800d9842.html#wp1001062

regds

[Sureshdank]

Prem thanks for the reply. In my case nobody is going to connect to this PRI line.

Actually what I want is, I have a 2Mbps leased line on Serial interface, now when it goes down I want ISDN link to comeup and send the data.

Hope you understood my requirment.

Thanks in Advance,

Suresh Jain

[spremkumar]

Hi Suresh

You need to do 3 step configuration for your dial backup requirement using your PRI line.

Step 1 includes the following configuration :

isdn switch-type switch-type

framing crc4

linecode hdb3

pri-group

Step 2 includes configuring the serial interface based on your requirement (dialin or dial out) which is dial out in your case..

interface Serial0:23

no ip address

encapsulation ppp

dialer pool-member 10

isdn switch-type

no cdp enable

ppp authentication chap

ppp multilink

Step 3 includes dialer profiles which can be used to dial out..

interface Dialer1

ip address x.x.x.x y.y.y.y

encapsulation ppp

dialer remote-name remotename

dialer idle-timeout xxx(in sec)

dialer string xxxxxx

dialer load-threshold 1 outbound

dialer-group 1

ppp authentication chap

ppp multilink

do take care of authentication with the SP side and also the dialer group.

Also for more info you can refer this link..

http://cisco.com/en/US/tech/tk801/tk133/technologies_configuration_example09186a0080094559.shtml

regds

[Sureshdank]

Sorry to bother you prem, still many doubts as I have never came accross with ISDN before.

What is the information that I need to collect from my ISDN provider.

What IP should I give it go dialer interface is it the same which I have given to me Serial interface or any other. Should I also give default route to dialer interface.

Thanks in Advance

Suresh Jain

[smothuku]

Hi Suresh ,

You need to collect following things from isdn provider.

1.ISDN number of local and remote sites.

2.check the framing , line code

3.who is providing ip address for isdn line

After getting the isdn numbers it is esy to configure the E1 as said above.

You need to configure the router for dialer as below.

ip route 0.0.0.0 0.0.0.0 dialer 0 120

The above route is called floating static route and it willn't present in routing table as long as serial line is up.

Hope it helps you.

Thanks,

satish

[Sureshdank]

Thanks for your help pre, I will configure it tomm. and let you know.

Thanks

Suresh Jain

[Sureshdank]

Satish,

Is it possible for you to just explain me how the ISDN connectivity happens, I mean starting from router to end point.

Regards,

Suresh Jain