L2TP - About General DSL Technology

Hi Fellas,

I am going to write something about xDSL Tech;








Consider those beautiful ATM Clouds as "IP" Please !

Cisco CCIE v5 exam makes us responsible to learn such DSL issues ; access group (a bba-group) that configuring broadband connection on ISP site. (I will share the lab in a couple of days)

Whatever...

In this scenerio, we use Cisco Router with (WIC card is using also it should be HWIC-1ADSL-M compatible ADSL, ADSL2 and ADSL2+ for Annex A) as home regulare CPE (modem) right?

The cloud represents there are lots of customers like us that is big, fluffy cloud.









Customer end is RJ 11, DSLAM connection is RJ 21. Thats how we connect multiple customers to single point on IP-DSLAM.


PPP Sessions Through Third-Party ISP







What is third party ISP  ?

ILEC - Independent Local Exchange Carrier - these are the companies that own the actual lines out on the pole or buried in the ground.

CLEC - Competitive Local Exchange Carrier - these are the companies that have the equipment to provide you 3rd party service over the ILEC lines.





The PPP session is initiated from the customer, it includes some authentication parameters, such as the CHAP username and password. Typically the username would contain a domain name such as stevegarbett@plusnet.net and some random password.

 Than we need a way of tunneling the layer 2 ppp session over towards the 3rd-party ISP’s route , after that  the ISP authenticates the customers PPP credentials, which then gives the customer access to the service provider network.