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Chapter 5: ISDN Simulator and Cisco Routers
Since many simulator users intend to use their product with Cisco routers, we will illustrate practical setup
and troubleshooting with Cisco examples. The simulator supports physical connectivity for the two Basic Rate
Interface types, the S/T Reference Point used inside customer premises, and the U Reference Point between
the customer premises and the provider end ofce.
A good starting point is to remember that the isdn switch-type congured, as a global command in the router,
must match one of the types in Table 1 if you are to have any success in operations.
Obviously, you can look at the Cisco conguration for switch-type commands, but, in a lengthy conguration, it
can sometimes be hard to nd the right line.
An alternative is to use the “show isdn status” command. This is a good command to check for success at
each successive stage of conguration: global, layer 1, layer 2 and layer 3. The switch type is set globally for
the entire router. Layer 1
Figure 10 for an example of “show isdn status” output before the switch type is set.
Layer 1
Figure 10: Show ISDN Status with undened Switch Type
Router#sh isdn stat
**** No ISDN Switchtype currently dened ****
ISDN BRI0 interface
Layer 1 Status:
DEACTIVATED
Layer 2 Status:
Layer 2 NOT Activated
Layer 3 Status:
0 Active Layer 3 Call(s)
Activated dsl 0 CCBs = 0
The Free Channel Mask: 0x80000003
Total Allocated ISDN CCBs = 0
Once you have the switch type dened, you should see the Yellow LED light and the following output from the
show isdn status command.
Figure 11: Cisco display for active physical layer
Router#sh isdn stat
The current ISDN Switchtype = basic-ni1
ISDN BRI0 interface
Layer 1 Status:
ACTIVE
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