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CCNA test achievement depends generally on seeing the subtleties, and this is particularly valid for designs including straightforwardly associated sequential interfaces. What's more, obviously, it's insufficient to see these subtleties - you must recognize what to do about them!

A Cisco switch is a DTE as a matter of course, however legitimately associating two DTEs with a DCE/DTE link isn't sufficient. In the accompanying model, R1 and R3 are legitimately associated at their Serial1 interfaces. The line goes up quickly in the wake of being opened, yet the line convention goes down after around 30 seconds.

R3(config-if)#int s1

R3(config-if)#ip address 172.12.13.3 255.255.255.0

R3(config-if)#no shutdown

2d18h: %LINK-3-UPDOWN: Interface Serial1, switched state to up

2d18h: %LINEPROTO-5-UPDOWN: Line convention on Interface Serial1, switched state to up

R3(config-if)#

2d18h: %LINEPROTO-5-UPDOWN: Line convention on Interface Serial1, changed state to down

The issue is that one of the switches needs to go about as the DCE all together for the line convention to come up and keep awake. In the event that this were your CCNA/CCNP home lab, you could simply go over and take a gander at the DTE/DCE link to see which switch had the DCE end of the link appended. In this model, however, we don't have physical access to the switches. How might we tell which switch has the DCE end of the link connected?

R3#show controller sequential 1

HD unit 1, idb = 0x1C44E8, driver structure at 0x1CBAC8

support size 1524 HD unit 1, V.35 DCE link

The show controller direction gives us this data. (There's much more yield that this with this direction, however it's immaterial for our motivations.) The switch with the DCE end of the link needs to supply a clock rate to the DTE, and we'll do only that with the interface-level clockrate order.


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R3#conf t

Enter setup directions, one for every line. End with CNTL/Z.

R3(config)#int serial1

R3(config-if)#clockrate 56000

2d18h: %LINEPROTO-5-UPDOWN: Line convention on Interface Serial1, switched state to up

In only a couple of moments, the line convention goes up and keeps awake.

When investigating an association, consistently run show interface first. On the off chance that you see the blend demonstrated as follows, the association is physically fine yet legitimately down. That is commonly the aftereffect of a required keepalive not being available. With Edge Hand-off, it's presumably a LMI issue, however with legitimately associated sequential interfaces the issue is in all likelihood the DCE end of the association not providing clockrate.

R3#show interface sequential 1

Serial1 is up, line convention is down

Investigating is a major piece of the activity, and it's a major piece of the Cisco CCNA and CCNP programs too. Know your show and investigate directions and you're headed to passing the CCNA!