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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 DEACTIVATED<br />

Layer 1 U interface is ACTIVATED.<br />

kissane#sh int bri0/0<br />

BRI0/0 is administratively down, line protocol is down<br />

Hardware is PQUICC BRI with U interface<br />

Internet address is 192.168.1.2/24<br />

MTU 1500 <strong>by</strong>tes, BW 64 Kbit, DLY 20000 usec, rely 255/255, load 1/255<br />

Encapsulation PPP, loopback not set<br />

kissane#sh prot<br />

Global values:<br />

Internet Protocol routing is enabled<br />

Ethernet0/0 is administratively down, line protocol is down<br />

Serial0/0 is administratively down, line protocol is down<br />

BRI0/0 is administratively down, line protocol is down<br />

Internet address is 192.168.1.2/24<br />

BRI0/0:1 is administratively down, line protocol is down<br />

BRI0/0:2 is administratively down, line protocol is down<br />

Serial0/1 is administratively down, line protocol is down<br />

Loopback0 is up, line protocol is up<br />

Internet address is 192.168.200.1/24<br />

To fix this, go into your configuration under the BRI interfaces and type “no shut.”<br />

No ISDN cable connected (layer 1)<br />

If you are trying these one at a time, then verify good proper operation after trying each.<br />

It will keep you from being confused. For this scenario I just unplugged one of the BRI<br />

straight-through cables from the BRI interface on the router. Interestingly sh int an sh<br />

protocols still show the line as up. Only the sh controllers show it being deactivated. If it<br />

is not connected then the debugs will not work. Ok. So you are wondering why not just<br />

look at the connections in front of you? Because sometimes one router will be in Detroit<br />

and the other one will be in Chicago (or something like that) and it is nice to “learn” if a<br />

cable is physically connected without physically being there.<br />

kissane#sh isdn status<br />

Global ISDN Switchtype = basic-ni<br />

ISDN BRI0/0 interface<br />

dsl 0, interface ISDN Switchtype = basic-ni<br />

Layer 1 Status:<br />

DEACTIVATED<br />

Layer 2 Status:<br />

TEI = 64, Ces = 1, SAPI = 0, State = TEI_ASSIGNED<br />

Spid Status:<br />

433

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