From: Michael King (kingmi1@xxxxxxxxx)
Date: Sun Dec 24 2000 - 01:26:16 GMT-3
The below scenario has been floating around with 2
soltions. A case can be made for both. Which one is
what Cisco wants to see if it should be on the test?
Scenario:
Line speed is 64k
Discard Eligible bit is set after 48k
Discard after 64k
Slow down to 16k if there is congestion
Solution 1:
CIR is 48k
BC is 6k
BE is 64k
MinCir is 16k
Reasoning:
CIR is 48k since the DE bit doesn't get set until
after 48k. BC is 6k since BC=CIR/8. BE is typically
limited to the port speed of the line, 64k. MinCir is
the minimum amount of data to be sent during times of
congestion and it states 16k for this.
Solution 2:
CIR is 64k
BC is 8k
BE is 0
MinCir is 48k
Reasoning: This came from a Cisco document at:
http://www.cisco.com/warp/public/125/21.shtml
CIR is 64k because you would want to send at line
speed when there is no congestion. BC is 8k since
BC=CIR/8. BE is 0 because you are already at line
speed. MinCir is 48k because this is what you would
slow down to during congestion. This is the CIR the
provider promised.
If the second solution is correct then does that mean
you shouldn't slow down to 16k like it states?
HELP
Mike
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