Hi all,
when calculating the delay for a certain packet size between 2 sites,
I usually use the following formula:
delay = access transmission+ backbone transmission+ access transmission
where:
backbone transmission = data provided by the network service provider (for
example "on my frame relay network, a packet of 128 bytes is transmitted
between two pops in maximum 100ms)
Access transmission = serialization delay + transmission delay + queuing
delay.
serialization delay = packet size*8/access line speed
(for example 128 bytes on a 128 kbps line = 8 ms)
transmsission delay is the delay to transport the bits at copper wire speed
(usually max 2ms depending on length of line)
Queuing delay (in the router) = ??? that's my question.
If there is no traffic queuing delay = 0 ?
If line loaded at 20, 50, 80 % what is the queuing delay?
What is the theoretical formula for queuing delay?
What is the influence of QoS (CB-WFQ, PQ, CQ, Fragmentation)?
I have never found quantitative information about this on cisco web site
despite several attempts, only qualitative info describing how
prioritization works.
I would be grateful if anyone could provide me with this info, based on
theory, statistical or empirical sources.
thanks in advance
Laurent
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