From: Andrew B. Caslow (abcaslow@netmasterclass.net)
Date: Sat May 07 2005 - 07:13:07 GMT-3
Jim,
In order to get your configuration to work, you must increase the maximum
reservable bandwidth command on your serial interface. This increases the
amount of bandwidth the can be applied to MQC queuing policies for a single
policy-map. Here is the IOS interface configuration command to increase the
maximum reservable bandwidth:
r1(config-if)#max-reserved-bandwidth ?
<1-100> Max. reservable bandwidth as % of interface bandwidth
You can check the default setting of the max-reserved-bandwidth for a given
interface by entering the following show command:
r1(config-if)#do sh inte s0/0 | i Bandwidth
Available Bandwidth 1158 kilobits/sec
Notice the default "available bandwidth" for a serial interface is 1158. If
you divide this value by the interface reference Bandwidth value you
supplied (1544 for a Cisco serial interface you get: 1158/1544 = .75 (75%).
This is the default max-reserved-bandwidth percentage for Cisco interfaces.
Always check IOS versions. Default values may vary as new IOS versions are
released. (Make no assumptions.)
Since your policy-map configuration defines three classes that have been
allocated a total of 90% of an interfaces bandwidth, you have at least two
options if you want to use the MQC "bandwidth percent" command:
Option 1: increase the interface's max-reserved-bandwidth value to 90%
Option 2: decrease the percentage value of bandwidth for one of your classes
or a combination of your classes.
"Know Your Options. Make No Assumptions" :)
There is a page in the NMC Technical Library on setting the
Max-Reserved-Bandwidth. Just do a full-text search on max-reserved-bandwidth
using the Tech Lib's full text search engine and it will supply you with
lots of examples.
I hope this helps and I hope all is well.
-Bruce Caslow CCIE #3139
NetMasterClass, LLC
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
James Matrisciano
Sent: Friday, May 06, 2005 11:13 AM
To: ccielab@groupstudy.com
Subject: QoS question
When I build a CBWFQ policy....such as this:
class-map match-all qos1
match access-group name qos1
class-map match-all qos2
match access-group name qos2
!
!
policy-map qos
class qos1
bandwidth percent 15
class qos2
bandwidth percent 30
class class-default
bandwidth percent 45
!
Why do I get the following after applying it to a serial interface:
Router(config-if)#service-policy out qos
I/f Serial0/0 class class-default requested bandwidth 45%, available
only 30%
Tought that it allotted for the over head....how much do I have to take
off the top, and to get those percentages, do I use a bandwidth (no
percentage) statement and what is the base line of bandwidth I start
subtracting from?
Router#sh int s0/0
Serial0/0 is up, line protocol is up
Hardware is PowerQUICC Serial
Internet address is 1.1.1.1/24
MTU 1500 bytes, BW 1544 Kbit, DLY 20000 usec,
Look forward to any responses, thanks!
jm
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