04-17-2009 02:52 AM - edited 03-04-2019 04:24 AM
I have a Cisco 876W router and would like some assistance to enable the router to connect to ISP using the ISDN interface as the WAN link. The IOS has been upgraded to c870-advipservicesk9-mz.124-15.T7.bin. I have attached the running-config file The link led light on the router front panel is lit and the cd light is also blinking. The BRI0 & Dialer0 config were obtained from firewall.cx website. Please know that I am relatively new to cisco routers. I have tried different ISDN cables between telco ISDN unit and the router (all to no avail). Is a chat script required to initialize the ISDN dial up system in a way analagous to modem chat script initialization? SDM Config helped set up basic router configuration. Do I need to contact ISP for advice from their side?
04-17-2009 07:04 AM
Hello Philip,
you need to contact ISP people for sure to know what account to use and what authentication protocol, and how they present to you
Under int dialer config you need:
ppp authentication pap chap
in global config you need
username isp-remote-name password shared-pwd
or other variations like:
ppp authentication pap chap callin
you can troubleshoot using
terminal monitor
debug ppp negotiation
debug ppp authentication
if you like you can attach in a text file the output of the show commands
But the first step is to contact your ISP.
to check isdn use
sh isdn status
it should show
L1: activated
L2 multiple-frame-established
Hope to help
Giuseppe
04-17-2009 08:49 AM
Many thanks Giuseppe for bothering to reply:
I don't know if the following is any help. I haven't got any output from the debug settings.
The output of show isdn status is as follows:
Global ISDN Switchtype = basic-net3
ISDN BRI0 interface
dsl 0, interface ISDN Switchtype = basic-net3
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 78, Ces = 1, SAPI = 0, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
0 Active Layer 3 Call(s)
Active dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Total Allocated ISDN CCBs = 0
I have the correct ISP login details entered into the running-config file. I can authenticate to ISP under Linux with an ISDN T/A using /etc/ppp/pap or chap-secrets. I masked out ISP Login details in the config file posted earlier.
04-17-2009 09:05 AM
Hello Philip,
the best way is to do
int bri0
shut
then you do
terminal monitor
debug ppp neg
debug ppp auth
int bri0
no shut
this triggers a new negotiation
ISDN status is fine
to use authentication you need
the
ppp authentication pap chap
command under dialer interface
Hope to help
Giuseppe
04-17-2009 11:01 AM
According to the datasheet:
you need advanced enterprise image for ISDN primary WAN link. Other images can only use the BRI port for out-of-band management.
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