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

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Ouch! Obviously trouble here. We can see we are suppose to be a DTE<br />

connection. Let’s start at layer 1 and work our way up:<br />

make#sh controller s0/0<br />

Interface Serial0/0<br />

Hardware is PowerQUICC MPC860<br />

DCE V.35, no clock<br />

idb at 0x80F3DD50, driver data structure at 0x80F43264<br />

Whammo! Nailed that one quicker than a new bucket of chicken at an all you can<br />

eat buffet! The show controllers command tells us we have the dce with no clock,<br />

which is wrong. We must use dte.<br />

5. No serial connection. This one is just as easy.<br />

router#sh frame pvc<br />

PVC Statistics for interface Serial0/0 (Frame Relay DTE)<br />

router#sh controller s0/0<br />

Interface Serial0/0<br />

Hardware is PowerQUICC MPC860<br />

No serial cable attached<br />

6. Incorrect serial line encapsulation<br />

router#sh frame pvc<br />

router#sh controller s0/0<br />

Interface Serial0/0<br />

Hardware is PowerQUICC MPC860<br />

DTE V.35 TX and RX clocks detected.<br />

make#sh int s0/0<br />

Serial0/0 is up, line protocol is up<br />

Hardware is PowerQUICC Serial<br />

Internet address is 192.168.1.2/24<br />

MTU 1500 <strong>by</strong>tes, BW 1544 Kbit, DLY 20000 usec, rely 255/255, load 1/255<br />

Encapsulation HDLC, loopback not set, keepalive set (10 sec)<br />

Bingo! We go back and change our encapsulation type to frame relay and it<br />

works.<br />

408

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