Cisco Router: Clock rate significance

Hi experts,


       Could anyone please tell me what is the significance of the 'clock rate' settings in the cisco routers?
I want to know why it is used and for what it is used?


Thanks,
expertblrAsked:
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ECNSSMTCommented:
its just a timing signal to synchronize data transfers.  Directly between routers I've set it at 56000, with the DCE side providing the signal.  WAN wise, the DCE side (telco) provides the timing signal.
Regards,
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jabiiiCommented:
It's used so they can talk to each other, without it you get nothing. as ECN said already.
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MarkDozierCommented:
yeap. what they said, for your purposes this is enough information. But it is a CRTICAL bit of knowledge to have.
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expertblrAuthor Commented:
Does the clock rate in anyway related to the bandwidth set on the Serial interface?
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MarkDozierCommented:
great question.
NO.
clock rate is a timer,
The  bandwidth command controls the bandwidth you wish to assign to the interface.. an example would br
bandwidth 64. giving you a bandwidth of 64 Kbps for use.
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calvinetterCommented:
Clock rate determines the speed at which to transfer data on synchronous interfaces, as ECNSSMT alluded to.  If you specify 64000 for the clock rate, the link will transfer data at 64 kbps.
  The "bandwidth" command on a router interface does *not* control the speed of the interface (a common misconception).  The bandwidth command really used to inform routing protocols, of the bandwidth capabilities of the interface.  Routing protocols such as EIGRP take into consideration the "reported bandwidth" of links, to determine the best path to take.
   See also:
  'bandwidth' command (note the "Usage Guidelines" section especially):
http://www.cisco.com/univercd/cc/td/doc/product/software/ios122/122cgcr/finter_r/irfacces.htm#wp1120696

  'clock rate' command:
http://www.cisco.com/univercd/cc/td/doc/product/software/ios113ed/cs/csprtd/csprtd1/cssyncs.htm#xtocid55391

cheers
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expertblrAuthor Commented:
Excellent calvin!!

Thanks.
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ECNSSMTCommented:
dog-gone-it, I guess when you snooze you lose.

Regards,
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MarkDozierCommented:
Excellent calvin!!, Thatg is what I was trying to say without all the detail. sometimes you just have to spell it  out.
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