From: ccie2be (ccie2be@nyc.rr.com)
Date: Mon Mar 21 2005 - 11:16:53 GMT-3
Dillon,
I've been following this thread and it seems that you're still not clear on
this point.
When using a serial link, regardless of the encap method, one side of the
link must be dce and the other side must be dte. It doesn't matter which
side is which.
Usually, the F/R switch interface is the dce side and the router interface
is dte but it doesn't have to be that way. It can be the other way around.
The key point is that if one side is DTE the other side is DCE. That's all
there is to it. (Well, that's almost all there is to it. You have to know
how to make a interface the DCE side by using the clock rate command which
you already know.)
Oh, while I think of it, I'll just mention one other point. When you're
setting the clock rate and you enter "?" to see what rates are available,
but I've found that not all clock rates will actually work. My guess is
that the highest clock rate depends on the interface hardware while the
clock rates that show up following the "?" depend on the IOS. And, I've
discovered that the IOS will let you set a clock rate that won't work - I've
done that and have been quite confused about that.
So far, I don't know of any show command which will tell me what the highest
GOOD clock rate is although I suspect such a command exists. So, what I've
done to find the highest clock rate is set the clock rate to some arbitrary
value and tested by pinging the remote router. If the ping works, I reset
the clock rate to a higher value and test again. If the clock rate doesn't
work, I reset the clock rate to a lower value.
I've heard that serial interfaces come in two flavors: low speed and high
speed which are 115 kbps and T1, respectively. But, I've found the highest
GOOD clock rates to sometimes be 384 kbps which I don't understand.
If anyone knows a show command or a better way to determine to find out the
highest GOOD clock rate, please don't hesitate to jump in.
HTH, Tim
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Dillon Yang
Sent: Sunday, March 20, 2005 12:22 AM
To: Group Study
Subject: DTE on FR switch
Hi, group:
I know it is a stupid question, but I want somebody to clarify it.
I just did a rental lab and found the FR switch does not work when I pasted
the initial config provided by the vendor. Then I entered command "show
control serial xxx" and got all messages with "DTE" on the FR switch and
"DCE" on the normal FR routers.
So, can DTE link be used on the FR switch?
TIA
dillon
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