SHDSL using an external modem

[ross]

Hello,

Just wondering if it is a possible to configure a Cisco 2611XM for SHDSL using an external modem such as the RAD product ASMi-52 which does the line sync for you.

The CHAP authentication needs to be done by the router behind it (2611XM in this case).

I've never done this without a wic, any help would be greatly appreciated.

[lgijssel]

You will need to configure PPPoE. Please check the general technology page for any usable info or configuration examples:

http://www.cisco.com/en/US/tech/tk175/tk819/tsd_technology_support_protocol_home.html

Regards,

Leo

[ross]

Hi Leo,

Is PPPoE used for SHDSL? sorry for the silly question !

A standard SHDSL connection with a WIC looks like this:

!

interface ATM0

no ip address

no atm ilmi-keepalive

dsl equipment-type CPE

dsl operating-mode GSHDSL symmetric annex B

dsl linerate AUTO

!

interface ATM0.1 point-to-point

description INTERNET

pvc 1/34

ubr 1024

encapsulation aal5mux ppp dialer

dialer pool-member 1

!

!

interface Dialer1

description INTERNET

ip address negotiated

ip nat outside

encapsulation ppp

dialer pool 1

dialer-group 1

no cdp enable

ppp authentication chap callin

ppp chap hostname xxxxxxxxx@xxxxxx

ppp chap password xxxxxxxxxx

crypto map mymap

!

In my scenario, I'm not using the WIC, so I'm a bit confused as to how the configuration shouyld like as I have no ATM interface.

[lgijssel · Accepted solution]

You need to do chap on the router. Chap is a ppp authentication method hence it is logical to assume that you will be using ppp and while you do this via the router's ethernet port it must be PPPoE.

Please check the config example below:

http://www.cisco.com/en/US/products/sw/iosswrel/ps1834/products_feature_guide09186a00800800f4.html

Regards,

Leo

[ross]

Got it, thanks Leo.

The SHDSL provider also only uses PPPoA, but it worked. Thanks again.