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Community Member

ISDN keps disconnecting

I have one router 2600 dialing into my hub 7200. The call keeps disconnecting every split second. The only change was the ISDN lines were reordered. Here is the debug q931 info. Any help would be appreciated.

4 REPLIES
Silver

Re: ISDN keps disconnecting

Hi

It was long time since I did isdn, but I think next step would be to check the ppp connection.

Try with "debug ppp authentication" and "debug ppp negotiation" to see how ppp is functioning.

/Mikael

Re: ISDN keps disconnecting

*Mar 21 18:33:44: ISDN BR0/0 Q931: RX <- CONNECT pd = 8 callref = 0x90

*Mar 21 18:33:44: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to up

*Mar 21 18:33:44: %ISDN-6-CONNECT: Interface BRI0/0:1 is now connected to 1xxxxxxxxxx N/A

*Mar 21 18:33:44: ISDN BR0/0 Q931: TX -> CONNECT_ACK pd = 8 callref = 0x10

*Mar 21 18:33:45: ISDN BR0/0 Q931: RX <- DISCONNECT pd = 8 callref = 0x90

Cause i = 0x8290 - Normal call clearing

*Mar 21 18:33:45: %ISDN-6-DISCONNECT: Interface BRI0/0:1 disconnected from 1xxxxxxxxxx , call lasted 1 seconds

*Mar 21 18:33:45: %LINK-3-UPDOWN: Interface BRI0/0:1, changed state to down

*Mar 21 18:33:45: ISDN BR0/0 Q931: TX -> RELEASE pd = 8 callref = 0x10

*Mar 21 18:33:45: ISDN BR0/0 Q931: RX <- INFORMATION pd = 8 callref = N/A

Feature Indicate i = 0x8200

*Mar 21 18:33:45: ISDN BR0/0 Q931: RX <- RELEASE_COMP pd = 8 callref = 0x90

Hi,

As per the debug, for ISDN L-2/L-3 its a perfectly normal call clearing, hence its something else at a higher level.

Could you please paste the sh run interface config from both the routers to help us understand better about the issue

Regards

Community Member

Re: ISDN keps disconnecting

HUB side

interface BRI5/0

no ip address

encapsulation ppp

shutdown

dialer pool-member 1

isdn switch-type basic-ni

isdn spid1 xxxxxxxxxxxxxxxxxxxxxx

isdn spid2 xxxxxxxxxxxxxxxxxxxxxx

no cdp enable

ppp authentication chap pap

----------------------------

interface Dialer1

ip address 10.10.10.2 255.255.255.252

encapsulation ppp

dialer in-band

no cdp enable

ppp authentication chap pap

ppp multilink

--------------------------------------

Spoke Side

interface BRI0/0

no ip address

encapsulation ppp

shutdown

dialer rotary-group 1

dialer-group 1

isdn switch-type basic-ni

isdn spid1 xxxxxxxxxxxxxxxxxxxxxx

isdn spid2 xxxxxxxxxxxxxxxxxxxxxx

isdn fast-rollover-delay 1

-------

interface Dialer1

description connected to xxxxx

ip address 10.10.10.1 255.255.255.252

encapsulation ppp

no ip route-cache cef

no ip split-horizon

dialer in-band

dialer idle-timeout 60

dialer string 1xxxxxxxxxx

dialer string 1xxxxxxxxxx

dialer hold-queue 10

dialer load-threshold 2 either

dialer-group 1

ppp chap hostname KWEPDX

ppp chap password 7 xxxxxxxxxxxxx

ppp pap sent-username KWEPDX password 7 xxxxxxxxxxxxx

ppp multilink

Silver

Re: ISDN keps disconnecting

This URL describes how to set up MLPPP over a DDR scenario. I think it will also help you set up your authentication. PAP and CHAP are set up a little differently from each other. Since CHAP is more secure, you may want to dispense with the PAP configuration altogether.

Depending on whether you want the spoke to authenticate to the hub, but not vice versa, you may want to configure CHAP CALLIN on the spoke router.

http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/mlppp_over_dial_ps6441_TSD_Products_Configuration_Guide_Chapter.html

HTH

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