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?
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
