From: Scott Morris (swm@emanon.com)
Date: Wed Jul 14 2004 - 10:30:13 GMT-3
It's a relationship. The max-reserved-bandwidth determines the maximum of
what IS available.
In 12.1, the percent was a reflection of the total bandwidth up to the max
reserved amount.
In 12.2, this changed to reflect a percentage of what was available, which
was determined by the max-reserved amount.
So the programmers just made our lives more complicated, that's all. :)
In 12.3, the command is/will be changing to reflect this relationship to
available bandwidth.
Scott Morris, CCIE4 (R&S/ISP-Dial/Security/Service Provider) #4713, CISSP,
JNCIP, et al.
IPExpert CCIE Program Manager
IPExpert Sr. Technical Instructor
swm@emanon.com/smorris@ipexpert.net
http://www.ipexpert.net
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
Robert
Sent: Monday, July 14, 2003 6:48 AM
To: Kenneth Wygand
Cc: ccielab@groupstudy.com
Subject: Re: Max-reserved-bandwidth question
Kenneth wrote:
<In older versions of code (12.1T and 12.2), the percentage you guaranteed
through "bandwidth-percent", is actually a percent of the
"max-reserved-bandwidth" as opposed to a percentage of the full link
bandwidth. However, in 12.2T and 12.3, this has been changed to reflect the
percentage of the full link bandwidth.>
This script seems to be made with IOS 12.1(5)T. The last Line of #show..
clearly shows the bandwidth available = 3000kbps. Here the #bandwidth
percent command is used to allocate a percentage of the configured bandwidth
of an interface( full link bandwidth) , not a percent of the " #
max-reserved-bandwidth".
Please, correct me if I am wrong.
Robert
(config)# policy-map Policy1
(config-pmap)# class Class1
(config-pmap-c)# bandwidth percent 20
(config-pmap)# class Class2
(config-pmap-c)# bandwidth percent 20
...........................
(config)# interface FastEthernet0/0
(config-if)# ip address 203.xxx 255.xxx
(config-if)# duplex auto
(config-if)# speed 10
(config-if)# max-reserved-bandwidth 80
(config-if)# service-policy output Policy1 (config-if)# ip rtp priority
16384 16383 1000
( config)#show interface fastethernet 0/0 Hardware is AmdFE, address is
0030.8546.aa00 (bia 0030.8546.aa00) Internet address is 203.xxx MTU BW 10000
Kbit, txload 1/255, Encapsulation ARPA, Keepalive set (10 sec) Half-duplex,
10Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last input
00:00:00, output Last clearing of "show interface" counters never Input
queue: Queueing weighted fair Output queue: 0/1000/64/0 (size/max
total/threshold/drops) Conversations 0/1/256 (active/max active/max total)
Available Bandwidth 3000 kilobits/sec Router#show interface fastethernet 0/0
FastEthernet0/0 is up, line protocol is up Hardware is AmdFE, address is
0030.8546.aa00 (bia 0030.8546.aa00) Internet address is 10.1.1.1/24 MTU 1500
bytes, BW 10000 Kbit, DLY 1000 usec, reliability 255/255, txload 1/255,
rxload 1/255 Encapsulation ARPA, loopback not set Keepalive set (10 sec)
Half-duplex, 10Mb/s, 100BaseTX/FX ARP type: ARPA, ARP Timeout 04:00:00 Last
input 00:00:00, output 00:00:09, output hang never Last clearing of "show
interface" counters never Input queue: 0/75/0/0 (size/max/drops/flushes);
Total output drops: 0 Queueing strategy: weighted fair Output queue:
0/1000/64/0 (size/max total/threshold/drops) Conversations 0/1/256
(active/max active/max total) Reserved Conversations 2/2 (allocated/max
allocated) Available Bandwidth 3000 kilobits/sec !
----- Original Message -----
From: Kenneth Wygand <KWygand@customonline.com>
To: Dan Shechter <danshtr@yahoo.com>
Cc: Yasser Aly <yasser.aly@noorgroup.net>; Scott Savage
<rolande23@sbcglobal.net>; <ccielab@groupstudy.com>
Sent: Wednesday, July 14, 2004 6:46 AM
Subject: RE: Max-reserved-bandwidth question
> Scott,
>
> Please read my last post on this topic, as I address your concern.
>
> Please let me know if you have trouble finding it.
>
> Thanks!
> Ken
>
> ________________________________
>
> From: nobody@groupstudy.com on behalf of Dan Shechter
> Sent: Tue 7/13/2004 8:18 AM
> To: Kenneth Wygand
> Cc: Yasser Aly; Scott Savage; ccielab@groupstudy.com
> Subject: Re: Max-reserved-bandwidth question
>
>
>
> So I wonder if during the lab before august 1, I should use bandwidth
> as relative number to max-reserve or as absalute number from the
> bandwidth of th einterface?
>
> Assuming the IOS in the lab is 12.2T.
>
>
> Kenneth Wygand wrote:
>
> >Scott,
> >
> >While either answer will technically work, "max-reserved-bandwidth
> >80" is
the more correct answer. This merely sets and upper bound on the cumulative
percentages of bandwidth you can "guarantee" (more appropriate than
"reserve", because other classes can use the bandwidth "guaranteed" for
another class when not being used). In older versions of code (12.1T and
12.2), the percentage you guaranteed through "bandwidth-percent", is
actually a percent of the "max-reserved-bandwidth" as opposed to a
percentage of the full link bandwidth. However, in 12.2T and 12.3, this has
been changed to reflect the percentage of the full link bandwidth.
> >
> >So in versions 12.2T and 12.3, the max-reserved-bandwidth is not used
> >in
any calculations, rather it is merely an upper boundary. It's like if you
wanted to take $800 out of an ATM machine (banking, not asynchronous
transfer mode ;-). Does it matter if the upper limit is $800 or $1000? No,
either way you will be able to accomplish what you need. But if the default
is $750, it would perhaps appear "more correct" or show a better
understanding of the technology if you raised it to $800, or 80% in your
case.
> >
> >There is still one catch. This leaves 20% for the default-class, but
this is not guaranteed during times of congestion. If you want to
-guarantee- 20% for the default-class, you will need to include a
bandwidth-percent command under the default-class and then change the
max-reserved-bandwidth to 100, since you are now actually reserving (again,
I don't like the terminology) 100% of the bandwidth.
> >
> >Hope this helps!
> >Ken
> >
> >________________________________
> >
> >From: nobody@groupstudy.com on behalf of Yasser Aly
> >Sent: Tue 7/13/2004 5:07 AM
> >To: Scott Savage; ccielab@groupstudy.com
> >Subject: RE: Max-reserved-bandwidth question
> >
> >
> >
> >Hi Scott,
> >
> > I didn's said that this is an RSVP question. It is as you said a
> >CBWFQ question. Still didn't get an answer on whether to set the
> >max-reserved-bandwidth to be 80 or 100.
> >
> >Regards,
> >Yasser
> >
> >-----Original Message-----
> >From: Scott Savage [mailto:rolande23@sbcglobal.net]
> >Sent: Tue 7/13/2004 6:10 AM
> >To: Yasser Aly; ccielab@groupstudy.com
> >Cc:
> >Subject: Re: Max-reserved-bandwidth question
> >Yasser are you sure this is an RSVP question? Sounds like you need to
> >be using CBWFQ and setting classes with bandwidth percent statements
> >or using Custom Queuing.
> >
> >--- Yasser Aly <yasser.aly@noorgroup.net> wrote:
> >
> >
> >>Hi Group,
> >>
> >> The task is asking to do the following
> >>
> >>Assign 30% for Class A
> >>Assign 20% for Class B
> >>Assign 30% for Class C
> >>
> >>The rest of the traffic will use the default-class.
> >>
> >>As the summation of the reserved bandwidth is over 75% so the
> >>max-reserved-bandwidth needs to be modified.
> >>
> >>My question is that would the max-reserved-bandwidth changed to be
> >>80%, or will it be changed to be 100% ?
> >>
> >>
> >
> >=====
> >--
> >Scott Savage
> >
> >_____________________________________________________________________
> >__ Please help support GroupStudy by purchasing your study materials
> >from:
> >http://shop.groupstudy.com
> >
> >Subscription information may be found at:
> >http://www.groupstudy.com/list/CCIELab.html
> >
> >_____________________________________________________________________
> >__ Please help support GroupStudy by purchasing your study materials
> >from:
> >http://shop.groupstudy.com
> >
> >Subscription information may be found at:
> >http://www.groupstudy.com/list/CCIELab.html
>
> ______________________________________________________________________
> _ Please help support GroupStudy by purchasing your study materials
> from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
> ______________________________________________________________________
> _ Please help support GroupStudy by purchasing your study materials
> from:
> http://shop.groupstudy.com
>
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
This archive was generated by hypermail 2.1.4 : Sun Aug 01 2004 - 10:11:55 GMT-3