From: Chua, Parry (Parry.Chua@xxxxxxxxxx)
Date: Thu Dec 06 2001 - 23:43:10 GMT-3
Hi,
The actual raw bandwidth(speed) of the serial line is depend the clock
rate regardless it is
DTE or DCE (physical). If we use DCE cable connect to Cisco router, we
need to configure the clock rate, if it is connected to the modem, then
the actual bandwidth is depend on clock rate of the modem.
The parameter bandwidth in Cisco router interface is to allow us to tell
the router process the bandwidth of this interface. It has mothing to
do with the real speed, it is for the routing process or subsystem that
need to use bandwidth to determine the cost/metric to a specify
destination. It may also affect the QoS/traffic rate configuration.
If the clock rate (in bps)is different to the bandwidth (in kbps), I
will pick the closer
bandwidth. Remember, you are advise to set bandwidth on all serial
interfaces regardless
it is DCE or DTE.
Regards
Parry
-----Original Message-----
From: Thomas Larus [mailto:tlarus@mwc.edu]
Sent: Friday, December 07, 2001 3:41 AM
To: ccielab@groupstudy.com
Subject: "clock rate 1300000." What is the bandwidth, and why can't you
set it to something closer to the default BW on fast serial interfaces?
The default bandwidth on the serial interfaces on 2500s is 1.544 mbps.
However, when you set the clock rate, the closest value is 1300000.
Could someone please explain the discrepancy? Clock rate 64000 gives
you bandwidth of 64000 mbps. If I use clock rate 1300000, what should
I put down as the bandwidth of the interface? 1300?
The IOS 12.1 docs on the clock rate command does not explain this.
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