From: Narvaez, Pablo (Pablo.Narvaez@xxxxxxxxxxxxx)
Date: Sat Apr 06 2002 - 16:08:45 GMT-3
ummmm If you do a "show controll ser x" do you see that speed as a legal option
? ..
R7(config-if)#clock rate 1544000
Unknown clock rate
R7(config-if)#clock rate ?
Speed (bits per second)
1200
2400
4800
9600
14400
19200
28800
32000
38400
56000
57600
64000
72000
115200
125000
128000
148000
192000
250000
256000
384000
500000
512000
768000
800000
1000000
1300000
2000000
4000000
8000000
<300-8000000> Choose clockrate from list above
R7(config-if)#clock rate 2000000
cheers,
hockito
-----Original Message-----
From: thomas larus [mailto:tlarus@mwc.edu]
Sent: Sabado, 06 de Abril de 2002 12:58 p.m.
To: Narvaez, Pablo; ccielab@groupstudy.com
Subject: Re: RE: What is relation between clockrate and bandwidth?
Common port speed 1544000, but no clock rate like
I understand that the bandwidth command is for routing protocol purposes.
I am sorry that my question seemed to be about the bandwidth command. My quest
ion is about the relations between clock rate and the real bandwidth on the int
erface. I want an interface to be configured to be able to really carry 154400
0 mbps. I should think that to do this I would need to set a clock rate on the
interface of a that speed or a little bit higher, but that clock rate is not a
n option.
You said:
" For the lab, you may configure the clockrate as you wish as long as both ends
match. Just keep in mind that the bw will be responsable for the routing proto
col decisions ..."
I just tried to set the clockrate to 1544000, and it would not let me. (We hav
e all tried to do this at some point, probably.)
r2613(config-if)#clock rate ?
Speed (bits per second)
1200
2400
4800
9600
14400
19200
28800
32000
38400
56000
57600
64000
72000
115200
125000
128000
148000
192000
250000
256000
384000
500000
512000
768000
800000
1000000
1300000
2000000
4000000
8000000
<300-4000000> Choose clockrate from list above
r2613(config-if)#clock rate 1544000
Unknown clock rate
So which clock rate setting should I use in a home lab scenario setting where
I am trying to emulate a DS-1 of 1544000. Should I use clock rate of 2000000?
What do other folks use? This must be a question lots of you have had, and fo
und an adequate, and perhaps obvious answer.
Thanks for the excellent point about frame relay multipoint.
Thanks in advance.
Tom Larus
>>> "Naraez, Pablo" <Pablo.Narvaez@getronics.com> 04/06/02 13:29 PM >>>
The bandwith command if for routing protocols only, not for layer1 bandwith/spe
ed nor to indicate the rate of the line clock. You may have a clock rate of 640
00 and bandwith of 128k; most of the time you may want to set both at the same
rate in order for the routing protocol to work properly and calculate a "real"
metric for that link,
Some other times you may need to change that bw value, like in a multipoint sub
-if with EIGRP not to overflow the low speed PVCs whereas you have to keep the
clockrate according to the provided clock. In a real scenario, most of the time
s you don't have to deal with clockrates in the interfaces (usually DTEs for en
dpoints) since you take the clock from internal line and leave that job to the
csu/dsu.
For the lab, you may configure the clockrate as you wish as long as both ends m
atch. Just keep in mind that the bw will be responsable for the routing protoco
l decisions ...
cheers,
hockito
-----Original Message-----
From: thomas larus [mailto:tlarus@mwc.edu]
Sent: Sabado, 06 de Abril de 2002 12:02 p.m.
To: ccielab@groupstudy.com
Subject: What is relation between clockrate and bandwidth? Common port
speed 1544000, but no clock rate like
On my routers, I do not have the option of choosing a clock rate anywhere near
1544000 (the closest rate is 1300000), yet in countless scenarios (like Solie's
) we set the frame relay cir to 1544000. How can we have a port speed of 15440
00 when that is never an option on our routers as a clockspeed.
Could someone explain this.
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