From: Gajewski Mariusz (Mariusz.Gajewski@telekomunikacja.pl)
Date: Wed Apr 13 2005 - 07:55:09 GMT-3
Hi guys,
I just took an example from doc-cd :
---------------------------------
Policymap parent_policy
class parent
shape average 512000
service-policy child_policy
Policymap child_policy
class normal_type
police cir percent 30
In this sample configuration, there are two hierarchical policies; one
called parent_policy and one called
child_policy. In the policy map called child_policy, the police command has
been configured in the class
called normal_type. In this class, the percentage specified by for the
police (percent) command is
30 percent. The command will use 512 kbps, the peak rate, as the bandwidth
reference point for class
parent in the parent_policy. The police (percent) command will use 512 kbps
as the basis for calculating
the cir rate (512 kbps * 30 percent).
interface serial 4/0
service-policy output parent_policy
Policymap parent_policy
class parent
bandwidth 512
service-policy child_policy
In the above example, there is one policy map called parent_policy. In this
policy map, a peak rate has
not been specified. The bandwidth command has been used, but this command
does not represent the
=============================================================
maximum rate of bandwidth available. Therefore, the police (percent) command
will look to the next
===========================
higher level (in this case Serial interface 4/0) to get the bandwidth
reference point. Assuming the
bandwidth of the Series interface s4/0 is 1.5 Mbps, the police (percent)
command will use 1.5 Mbps as
the basis for calculating the cir rate (1500000 * 30 percent).
---------------------------- /end of example
And in the next paragraph , doc-cd says :
"How Bandwidth Is Calculated
The police (percent) command is often used in conjunction with the bandwidth
and priority commands.
The bandwidth and priority commands can be used to calculate the total
amount of bandwidth available
on an entity (for example, a physical interface)"
I don't understand why once bandwidth doesn't represent the maximum rate of
bandwidth available , but next-time bandwidth can be used to calculate the
total amount of
bandwidth available on physical interf. It seems to me that one contradicts
the other. I'm missing something here, but don't know what.
Anyone can shed some light on it ?
Thanks in advance,
Mariusz
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