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- The show interfaces bri{num:0 | 1} EXEC command displays the ISDN B channel status,
configurations, and statistics, eg: the number of input and output packets.
RT1#sh int bri0:1
BRI0:1 is up, line protocol is up
Hardware is BRI
MTU 1500 bytes, BW 64 Kbit, DLY 20000 usec,
reliability 255/255, txload 1/255, rxload 1/255
Encapsulation PPP, LCP Open
Open: CDPCP, IPCP, loopback not set
Keepalive set (10 sec)
--More—
- The show isdn active EXEC command displays general information about active calls.
- The show isdn status EXEC command can be used to display information of ISDN Layer 1,
2, and 3 statuses between a router ISDN interface and the ISDN switch, which are very useful for
ISDN troubleshooting.
RT1#sh isdn status
Global ISDN Switchtype = basic-ni
ISDN BRI0 interface
Layer 1 Status:
ACTIVE
Layer 2 Status:
TEI = 64, State = MULTIPLE_FRAME_ESTABLISHED
Layer 3 Status:
1 Active Layer 3 Call(s)
Active dsl 0 CCBs = 1
CCB:callid=8003, callref-0, sapi=0, ces=1, B-chan=1
Number of active calls = 1
Number of available B channels = 1
Total Allocated ISDN CCBs = 1
RT1#
Layer 3
Layer 2
Layer 1
B Channel D Channel
IP / IPX SS7 / DSS1 (Q.931)
HDLC / PPP LAPD (Q.921)
Figure 27-3: ISDN Standards on B and D Channels
- The debug isdn q921 privileged command displays the details of the LAPD protocol on the
ISDN D channel between a router ISDN interface and the ISDN switch (Layer 2 information).
- The debug isdn q931 privileged command displays the information of ISDN call setup and
termination activities (Layer 3 information).
- The debug dialer events and debug dialer packets privileged commands display the
packets that were routed out the dial interface and triggered the dialing process.
198
I.430 / I.431
Copyright © 2008 Yap Chin Hoong
yapchinhoong@hotmail.com