From: Tom Lijnse (Tom.Lijnse@globalknowledge.nl)
Date: Thu Feb 26 2004 - 07:51:59 GMT-3
Hi Michael,
The answer is: It depends....
Please have a look at:
http://www.cisco.com/en/US/tech/tk39/tk48/technologies_tech_note09186a00800fe2c1.shtml
This tech note states:
"In Cisco IOS Software Releases 12.1T and 12.2, the percentages that you define in your classes are a percentage of the available bandwidth, rather than the full interface or VC bandwidth."
on the other hand it also says:
"In Cisco IOS Software Releases 12.2T and 12.3, the bandwidth percent command has been made consistent among 7500 and 7200 and below. This means that now, the bandwidth percent is not referring anymore to a percentage of the Available Bandwidth, but to a percentage of the interface bandwidth. A class with a bandwidth percent command in a policy-map now has a fix calculated amount of bandwidth allocated to it, and the sum of all the bandwidth or bandwidth percent, priority and priority percent classes together has to respect the max reserved bandwidth rule.
The functionality of bandwidth percent as it was understood in Cisco IOS Software Releases 12.1T and 12.2 for the Cisco 7200 and below platforms has been preserved in Cisco IOS Software Releases 12.2T and 12.3 with the introduction of the new command bandwidth remaining percent."
So basically on 12.1T or 12.2 main line your percentages would be relative to the available bandwidth and on 12.2T or 12.3 main line it would be relative to the total bandwidth and this would require you to bump up the max-reserved-bandwidth if you want to allocate the full 100%.
Regards,
Tom Lijnse
CCIE #11031
Global Knowledge Netherlands
-----Original Message-----
From: Michael Snyder [mailto:msnyder@revolutioncomputer.com]
Sent: Thursday, February 26, 2004 6:48 AM
To: ccielab@groupstudy.com
Subject: interplay between mqc bandwidth percent and
max-reserved-bandwidth?
Two questions,
policy-map total
class one
bandwidth percent 11
class two
bandwidth percent 26
class three
bandwidth percent 4
class four
bandwidth percent 22
class five
bandwidth percent 15
class six
bandwidth percent 15
class class-default
bandwidth percent 7
If I apply this to an interface, is the bandwidth percent valued
calculated against the max-reserved-bandwidth? For example would class
one be 11% of the default 75% reserved bandwidth? My total adds to
100%, is that of whatever the max value is, or of the total interface
bandwidth value.
I'm assuming I need to up my max-reserved-bandwidth to 100%, what if I
didn't, would it prorate my values?
------------------------------------------------------------------------
-----
Let's add some complexity.
map-class frame-relay frameshape
frame-relay cir 192000
frame-relay bc 1920
no frame-relay adaptive-shaping
service-policy output total
frame-relay fragment 240
frame-relay ip rtp priority 16384 16383 48
Assuming I have a 48K voice call, does the class one get 11% of what's
left?
I'm assuming I don't need a max-reserved-bandwidth command on the
frame-relay interface.
Does the service-policy (named total) in this case get what's left
192000-48000, then calculates the class percent values? Or does rtp
priority and service-policy fight it out for the 192K of total
bandwidth?
Thanks for Your Time in Advance,
Michael
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