Available bandwindth and 'max-reserved bandwidth'

Is the max-reserved bandwidth only important when working with Qos classes and the bandwidth statement? Is the default 75% available bandwidth only used then?
In other words if I have a 100MB link with a service policy applied for Voice, Call-Control and video. After that I notice the available bandwidth on thie 100MB link is 61280 kilobits/sec.
If I put in a 'max-reserved bandwidth 95' would I reclaim another 20MB of bandwidth for the class-default? Would leaving 5% on the 100MB link for routing and other stuff be acceptable?
Here is the config and show commands:
class-map match-any Call-Control
match ip dscp cs3
match ip dscp af31
class-map match-any Video
match ip dscp af41
class-map match-any Voice
match ip dscp ef
policy-map QOS_classes_to_ACN
class Voice
priority 10000
class Call-Control
bandwidth 500
class Video
bandwidth 3220
class class-default
fair-queue
random-detect
interface FastEthernet6/0
description 100MB Link to ACN
ip address xxx.xxx.xxx.xxx xxx.xxx.xxx.xxx
ip route-cache flow
no ip mroute-cache
load-interval 30
duplex full
speed 100
service-policy output QOS_classes_to_ACN
ROC-RT7206-QMOE#sh int f6/0
FastEthernet6/0 is up, line protocol is up
Hardware is i82543 (Livengood), address is 00b0.4a28.3ca8 (bia 00b0.4a28.3ca8)
Description: 100MB Link to ACN
Internet address is xxx.xxx.xxx.xxx/xx
MTU 1500 bytes, BW 100000 Kbit, DLY 100 usec,
reliability 255/255, txload 183/255, rxload 21/255
Encapsulation ARPA, loopback not set
Keepalive set (10 sec)
Full-duplex, 100Mb/s, 100BaseTX/FX
ARP type: ARPA, ARP Timeout 04:00:00
Last input 00:00:03, output 00:00:00, output hang never
Last clearing of "show interface" counters 01:13:30
Input queue: 0/75/0/0 (size/max/drops/flushes); Total output drops: 5211742
Queueing strategy: Class-based queueing
Output queue: 70/1000/64/5211742 (size/max total/threshold/drops)
Conversations 2/35/256 (active/max active/max total)
Reserved Conversations 2/2 (allocated/max allocated)
Available Bandwidth 61280 kilobits/sec <--- Available bandwidth
30 second input rate 8615000 bits/sec, 6860 packets/sec
30 second output rate 71788000 bits/sec, 7484 packets/sec
31692173 packets input, 4263195179 bytes
Received 1204 broadcasts, 0 runts, 0 giants, 0 throttles
0 input errors, 0 CRC, 0 frame, 0 overrun, 0 ignored
0 watchdog
0 input packets with dribble condition detected
34536300 packets output, 2513155446 bytes, 0 underruns
0 output errors, 0 collisions, 0 interface resets
0 babbles, 0 late collision, 0 deferred
0 lost carrier, 0 no carrier
0 output buffer failures, 0 output buffers swapped out

Here is the output of show policy-pam int:
ROC-RT7206-QMOE#sh policy-map int f6/0
FastEthernet6/0
Service-policy output: QOS_classes_to_ACN
Class-map: Voice (match-any)
3417571 packets, 934178998 bytes
30 second offered rate 1722000 bps, drop rate 0 bps
Match: ip dscp ef (46)
3417571 packets, 934178998 bytes
30 second rate 1722000 bps
Queueing
Strict Priority
Output Queue: Conversation 264
Bandwidth 10000 (kbps) Burst 250000 (Bytes)
(pkts matched/bytes matched) 1908656/521903140
(total drops/bytes drops) 0/0
Class-map: Call-Control (match-any)
615085 packets, 48926098 bytes
30 second offered rate 84000 bps, drop rate 0 bps
Match: ip dscp cs3 (24)
588857 packets, 47299978 bytes
30 second rate 81000 bps
Match: ip dscp af31 (26)
26228 packets, 1626120 bytes
30 second rate 2000 bps
Queueing
Output Queue: Conversation 265
Bandwidth 500 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 337953/26882724
(depth/total drops/no-buffer drops) 0/0/0
Class-map: Video (match-any)
146136 packets, 82165408 bytes
30 second offered rate 90000 bps, drop rate 0 bps
Match: ip dscp af41 (34)
146136 packets, 82165408 bytes
30 second rate 90000 bps
Queueing
Output Queue: Conversation 266
Bandwidth 3220 (kbps) Max Threshold 64 (packets)
(pkts matched/bytes matched) 81687/45950190
(depth/total drops/no-buffer drops) 0/0/0
Class-map: class-default (match-any)
35227089 packets, 47492000208 bytes
30 second offered rate 87718000 bps, drop rate 14714000 bps
Match: any
Queueing
Flow Based Fair Queueing
Maximum Number of Hashed Queues 256
(total queued/total drops/no-buffer drops) 0/5171786/0
exponential weight: 9
class Transmitted Random drop Tail drop Minimum Maximum Mark
pkts/bytes pkts/bytes pkts/bytes thresh thresh prob
0 30181523/39910255774 1297726/1944176143 3893194/5836883998 20 40 1/10
1 0/0 0/0 0/0 22 40 1/10
2 0/0 0/0 0/0 24 40 1/10
3 0/0 0/0 0/0 26 40 1/10
4 0/0 0/0 0/0 28 40 1/10
5 0/0 0/0 0/0 30 40 1/10
6 1213/88749 0/0 0/0 32 40 1/10
7 0/0 0/0 0/0 34 40 1/10
rsvp 0/0 0/0 0/0 36 40 1/10

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Max-reserved-bandwidth 100% for the interface

According to CCO as following text, the remaining 25 percent of bandwidth is used for overhead, including Layer 2 overhead, control traffic, and best-effort traffic. I want to know why cisco choose 25 percent. why not 30% or 20%?
If I config the max-reserved-bandwidth 100% for the interface, does it will effect the routing protocol? also effect the network conectivity?
thanks for your answer
=======
Usage Guidelines for max-reserved-bandwidth
The sum of all bandwidth allocation on an interface should not exceed 75 percent of the available bandwidth on an interface. The remaining 25 percent of bandwidth is used for overhead, including Layer 2 overhead, control traffic, and best-effort traffic.
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Kevin,
this is the wrong group for this question.
Gilles.

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Hi all,
Can someone please help me to understand bandwidth reservation for CBWFQ.
By default you cannot allocate more than 75% of the interface bandwidth to your classes. My question is what is the point? theoretically it is reserved for your routing protocols etc.etc. but in reality if the interface is saturated isn't that extra 25% used by whatever traffic anyway? it not like you guarantee a maximum of 75%, you guarantee a minimum of 75% so the additional 25% is still up for grabs, it's just that it's not reserved for any class in particular.
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Hi Andres,
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hth,
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Hi everybody
I have been searching a command that will shows us the max-reseved bandwidth ( In the context of QOS) on cisco 7600.
I appreciate your help
Thanks
ciscoR1#show version
Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVIPSERVICESK9-M), Version 15.1(3)S5, RELEASE SOFTWARE (fc2)
Technical Support: http://www.cisco.com/techsupport
Copyright (c) 1986-2013 by Cisco Systems, Inc.
Compiled Tue 12-Feb-13 13:17 by prod_rel_team
ROM: System Bootstrap, Version 12.2(33r)SRD5, RELEASE SOFTWARE (fc1)
BOOTLDR: Cisco IOS Software, c7600rsp72043_rp Software (c7600rsp72043_rp-ADVIPSERVICESK9-M), Version 15.1(3)S5, RELEASE SOFTWARE (fc2)

Disclaimer
The Author of this posting offers the information contained within this posting without consideration and with the reader's understanding that there's no implied or expressed suitability or fitness for any purpose. Information provided is for informational purposes only and should not be construed as rendering professional advice of any kind. Usage of this posting's information is solely at reader's own risk.
Liability Disclaimer
In no event shall Author be liable for any damages whatsoever (including, without limitation, damages for loss of use, data or profit) arising out of the use or inability to use the posting's information even if Author has been advised of the possibility of such damage.
Posting
I'm uncertain, but on a 7600 with 15.x IOS, it's likely QoS is following the HQF changes, and if so, max-reserved-bandwidth has really been deprecated.

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Hello,
just today I found some time to read RFCs. and found:
4124 Protocol Extensions for Support of Diffserv-aware MPLS Traffic Engineering. F. Le Faucheur, Ed.. June 2005. (Format: TXT=79265 bytes) (Status: PROPOSED STANDARD)
4125 Maximum Allocation Bandwidth Constraints Model for Diffserv-aware MPLS Traffic Engineering. F. Le Faucheur, W. Lai. June 2005. (Format: TXT=22585 bytes) (Status: EXPERIMENTAL)
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4127 Russian Dolls Bandwidth Constraints Model for Diffserv-aware MPLS Traffic Engineering. F. Le Faucheur, Ed.. June 2005. (Format: TXT=23694 bytes) (Status: EXPERIMENTAL)
4128 Bandwidth Constraints Models for Differentiated Services (Diffserv)-aware MPLS Traffic Engineering: Performance Evaluation. W. Lai. June 2005. (Format: TXT=58691, PDF=201138 bytes) (Status: INFORMATIONAL)
4201 Link Bundling in MPLS Traffic Engineering (TE). K. Kompella, Y. Rekhter, L. Berger. October 2005. (Format: TXT=27033 bytes) (Updates RFC3471, RFC3472, RFC3473) (Status: PROPOSED STANDARD)
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http://download-west.oracle.com/docs/cd/B19306_01/server.102/b14237/dynviews_2048.htm#REFRN30204
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ARRAY           ELSE*           LOCK*           POSITIVE        SYSDATE*
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ASC*            END             LOOP            PRAGMA          THEN*
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lock_sga                             boolean     FALSE
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Message was edited by: ChrisJ4203

Available bandwindth and 'max-reserved bandwidth'

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