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Learning by Doing: CISCO Certified Network ... - SCN Research

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kissane#sh controller bri<br />

BRI unit 0:BRI unit 0 with U interface:<br />

Layer 1 internal state is ACTIVATED<br />

Layer 1 U interface is ACTIVATED.<br />

Not much help here…we expected it because we already learned our layer 1 is<br />

fine. We get the bri is “good” with sh int bri0/0 and sh prot too. But show<br />

protocols tells us something is wrong. Let’s move to our layer 2 commands. This<br />

is where we should find our problems.<br />

kissane#debug dialer packets<br />

Dial on demand packets debugging is on<br />

kissane#sh controller bri<br />

05:31:22: BR0/0 DDR: ip (s=192.168.1.2, d=224.0.0.10), 60 <strong>by</strong>tes, outgoing<br />

interesting (ip PERMIT)<br />

kissane#debug dialer packets<br />

05:31:26: BR0/0 DDR: ip (s=192.168.1.2, d=224.0.0.10), 60 <strong>by</strong>tes, outgoing<br />

interesting (ip PERMIT)<br />

Interesting traffic is being generated but the interface and protocol is not coming up. We<br />

need to look a bit further.<br />

kissane#undebug all<br />

All possible debugging has been turned off<br />

kissane#debug isdn q921<br />

ISDN Q921 packets debugging is on<br />

kissane#ping 192.168.1.1<br />

Type escape sequence to abort.<br />

Sending 5, 100-<strong>by</strong>te ICMP Echos to 192.168.1.1, timeout is 2 seconds:.....<br />

Success rate is 0 percent (0/5)<br />

05:32:53688777932: ISDN BR0/0: RX RRf sapi = 0 tei = 64 nr = 4<br />

Again, not much help here. The q.921 is being sent and received. Now let’s look at our<br />

PPP negotiation.<br />

kissane#undebug all<br />

All possible debugging has been turned off<br />

kissane#debug ppp nego<br />

PPP protocol negotiation debugging is on<br />

kissane#ping 192.168.1.1<br />

436

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