CCNA exam achievement relies upon largely on noticing the details, which is very true of configurations involving straight linked serial interfaces. And naturally, it’s not more than enough to note these facts – you’ve obtained to be aware of what to do about them!
A Cisco router is really a DTE by default, but specifically connecting two DTEs which has a http://edition.cnn.com/search/?text=먹튀검증 DCE/DTE cable will not be ample. In the subsequent illustration, R1 and R3 are instantly linked at their Serial1 interfaces. The road goes up briefly following being opened, but the road protocol goes down following about thirty seconds.
R3(config-if)#int s1
R3(config-if)#ip handle 172.12.13.3 255.255.255.0
R3(config-if)#no shutdown
2d18h: %Connection-three-UPDOWN: Interface Serial1, transformed point out to up
2d18h: %LINEPROTO-five-UPDOWN: Line protocol on Interface Serial1, improved point out to up
R3(config-if)#
2d18h: %LINEPROTO-5-UPDOWN: Line protocol on Interface Serial1, altered condition to down
The problem is on the list of routers must act because the DCE in order for the line protocol to come up and not sleep. If this were your CCNA / CCNP residence lab, you might just go about and consider the DTE/DCE cable to discover which router experienced the DCE conclusion on the cable attached. In this example, although, we don’t have Bodily use of the routers. How can we notify which router has the DCE close on the cable hooked up?
R3#clearly show controller serial 1
High definition device one, idb = 0x1C44E8, driver construction at 0x1CBAC8
buffer measurement 1524 HD unit 1, V.35 DCE cable
The clearly show controller command gives us this info. (There’s a good deal far more output that this with this command, nonetheless it’s unimportant for our reasons.) The router Along with the DCE end of the cable needs to supply a clock charge into the DTE, and we’ll just do that With all the interface-stage clockrate command.
R3#conf t
Enter configuration instructions, 1 for each line. Conclusion with CNTL/Z.
R3(config)#int serial1
R3(config-if)#clockrate 56000
In only a few seconds, the line protocol goes up and stays up.
When troubleshooting a connection, normally run exhibit interface first. If you see the combination demonstrated beneath, the relationship is physically fine but logically down. That’s commonly the results of a needed keepalive not becoming present. With Body Relay, it’s in all probability an LMI situation, but with instantly related serial interfaces The problem is probably the DCE conclusion with the connection not giving clockrate.
R3#present interface serial 1
Serial1 is up, line protocol is down
Troubleshooting is an enormous Portion of The work, and it’s an enormous Portion of the Cisco CCNA and CCNP packages likewise. Know your clearly show and debug commands 토토사이트 and you also’re on your approach to passing the CCNA!