Michael Berger wrote:
Hi There,
I would have a question regarding exercise 17.3 (well 6 questions
actually :) )
We are asked to "Configure the 3550 such as any port of vlan 11 does
not exceed 1 Mbps of transmission speed".
There is only fa0/1 in vlan11, so the config will happen there and the
solution applies the following policing
policy-map aPol
class class-default
police 1000000 187500 exceed drop
on
int fa0/1
service-policy input aPol
Q1: why is this applied on the *input* when we are asked to enforce the
*transmission* speed? Why not applying this in "output"?
Q2: we decide to use policing, ok but would shaping have been an option?
Would have this policy made the trick:
policy-map test
class class-default
shape average 1000000
!
and then apply it on the "output" of fa0/1?
ok for this one, is it that, if we using shaping, the switch will
transmit at clock speed and then remain silent to only average 1M while
policing will really make sure that no more that 1Mbps will be
transmitted?
Q3: Where does this 187500 bytes burst value come from? It is equivalent
to 1.5Mbps but why is it configured there?
Q4: What is the difference between "burst bytes" and bc in the following
output:
R2(config-pmap-c)#police cir 1000000 ?
<1000-512000000> Burst bytes
bc Conform burst
conform-action action when rate is less than conform burst
pir Peak Information Rate
<cr>
Q5: What is the difference between policing the CIR or directly a bps
value in the following output:
R2(config-pmap-c)#police ?
<8000-2000000000> Bits per second
cir Committed information rate
rate Specify police rate
Q6: Would this command
R2(config-pmap-c)#$police cir 1000000 bc 187500 conform-action tr
exceed-action drop
be equivalent to:
R2(config-pmap-c)#$police 1000000 187500 conform-action tr
exceed-action drop
?
Thanks in advance!
Michael
--
Michael Berger
Customer Support Engineer - Content Networking
Phone: +32 2 704 5536
Email: [EMAIL PROTECTED]
Euro TAC - CEST/GMT+2
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