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Chapter 8
Troubleshooting ISDN
00:27:26: BRI0: Dialing cause ip (s=10.1.1.2, d=10.1.1.1)
00:27:26: BRI0: Attempting to dial 18008358661
00:27:27: %LINK-3-UPDOWN: Interface BRI0:1, changed state
to up.
00:27:27: dialer Protocol up for BR0:1
00:27:28: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0:1, changed state to up
00:27:29: %LINK-3-UPDOWN: Interface BRI0:2, changed state
to up.!!!
Success rate is 60 percent (3/5), round-trip min/avg/max =
32/37/48 ms
Bottom#
00:27:29: dialer Protocol up for BR0:2
00:27:30: %LINEPROTO-5-UPDOWN: Line protocol on Interface
BRI0:2, changed state to up
Summary
I
n this chapter, some of the common issues confronting administrators
in ISDN networks were presented, including encapsulation, SPID configura-
tion, and Physical layer connections. In addition, the tools necessary for ana-
lyzing and resolving these problems were presented as they relate to the
Cisco IOS.
Other troubleshooting elements covered in this chapter include:
Router configurations
Physical wiring
Switch configurations
Cisco IOS commands for troubleshooting ISDN environments
The Basic Rate Interface (BRI) and the B and D channels
ISDN protocols--q.921 and q.931
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