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+ +	4.3		+ DDR Configuration
	+ 4.3.9		+ Troubleshooting the DDR + configuration

+ + + + + + +

There are two major types of DDR + problems. Either a router is not dialing when it should, or it is + constantly dialing when it should not. Several + debug + commands can be used to help troubleshoot problems with a DDR + configuration.

The + debug isdn q921 + command is useful for viewing Layer 2 ISDN call setup exchanges. + The “i =” + field in the Q.921 payload field is the hexadecimal value of a Q.931 + message. In the following lines, the seventh and eighth most significant + hexadecimal numbers in the “i =” field indicate the type of Q.931 + message:

0x05 indicates a call setup message +
0x02 indicates a call proceeding + message
0x07 indicates a call connect message +
0x0F indicates a connect + acknowledgment (ack) message

The + debug isdn q931 + command is useful for observing call setup exchanges for both outgoing + and incoming calls. + +

The + debug dialer [events | packets] + command is useful for troubleshooting DDR connectivity. The + debug dialer events + command sends a message to the console indicating when a DDR link has + connected and what traffic caused it to connect. + If a router + is not configured correctly for DDR, then the output of the command will + usually indicate the source of the problem. If there is no debug output, + then the router is not aware of any interesting traffic. An incorrectly + configured dialer or access list may be the cause.

Not all DDR problems result in an + interface failing to dial. Routing protocols can cause an interface to + continuously dial, even if there is no user data to send. An interface + that is constantly going up and down is said to be flapping. The + debug dialer packet + command sends a message to the console every time a packet is sent out a + DDR interface. Use this debug command to see exactly what traffic is + responsible for a flapping DDR interface.

If a router is not connecting when it + should, then it is possible that an ISDN problem is the cause, as + opposed to a DDR problem. The remote router may be incorrectly + configured, or there could be a problem with the ISDN carrier network. + Use the isdn call interface + command to force the local router to attempt to dial into the remote + router. If + the routers cannot communicate using this command, then the lack of + connectivity is an ISDN problem, not a DDR problem. However, if the + routers can communicate, then both the toll network and the ISDN + configurations on the routers are working properly. In this case, the + problem is most likely an error in the DDR configuration on either + router.

In some cases it is useful to reset the + connection between the router and the local ISDN switch. The + clear interface bri + command clears currently established connections on the interface and + resets the interface with the ISDN switch. This command forces the + router to renegotiate its SPIDs with the + ISDN switch, and is sometimes necessary after making changes to the + isdn spid1 + and isdn spid2 + commands on an interface.

+ + + + + +

+ + + + Lab Activity

+ +

e-Lab Activity: + + isdn spid

+ +

In this activity, the student will demonstrate how to use the + + isdn spid + command to define at the router the service profiles identifier + number that was assigned by the ISDN service provided for the B1 + channel.

+ +

+ + + + + + +

+ + + + + +

+ + Web Links

+ + +

Tech Notes

+ + http://www.cisco.com/en/US/tech/ + tk801/tk133/ tech_tech_notes_ ist.html

+ +

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