Re: QOS: Bc versus Packet length.

Hi Amr,

1 - Per TC you get enough tokens for sending 1000 bytes. This isn't
enough for the packet, so it's hold in a queue until the bucket is
filled with enough tokens for sending the packet. This behavior
differs from the various ways of doing shaping or policing.

2 - Same thing. The packet is hold in a queue until enough tokens are
available for sending the packet. The behavior changes if used on
frame-relay and you use the 'frame-relay fragment' command.

-- 
Regards,
Rick Mur
CCIE2 #21946 (R&S / Service Provider)
Juniper JNCIA-ER & JNCIA-EX
MCSA:Messaging, MCSE
Sr. Support Engineer  IPexpert, Inc.
URL: http://www.IPexpert.com
On 13 aug 2009, at 10:09, Amr Masoud wrote:
>> Dears,
>>
>> If we have a link with 128 Kbps speed, for a particular class we  
>> shape it
>> to CIR=64 Kbps, Tc= 125 msec --> Bc= 64000x125/1000= 8000 bit =  
>> 1000 byte.
>>
>> Given that, at the Bust period for this class:
>>
>> 1- What will happen to a Packet from this class with 1500 byte  
>> length ??
>> the Bc is only 1000 byte !!!. this packet requires more 500 bytes  
>> bits over
>> the Bc !
>>
>> 2- What will happen to the third Packet of three consequent packets  
>> from
>> that class with 400 byte per each packet. The summation of the  
>> first two
>> packets is 800 bytes
>>   still can be transmitted within the Bc (1000 byte), but the third
>> packets requires 200 bytes over the Bc !
>>
>> In those cases, Packets will be queued or transmitted, or  
>> fragmented ?
>>
>> Regards,
>> Amr Ahmed
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