From: Robert (k_robert@tsp.lviv.ua)
Date: Mon Jul 14 2003 - 09:24:21 GMT-3
Hi Ken,
1) the last line of #show interface FastEthernet0/0
............
<Available Bandwidth 3000 kilobits/sec>
In our case available bandwidth equals to 10000 kbps * 0.80 -
(10000*(20%+20%)+1000) kbps = 3000 kbps
This means: 4000 kbps reserved for two classes
1000 kbps reserved for voice or rtp traffic
3000 kbps is available for use
2000 reserved
IF the percent was derived from reserved bandwidth only ( 80%) then
10000kbps *0.80 - (8000*40%+1000)=3800
2000 reserved
3800 available
1000 rtp load
3200 our 40% for classes
2) As for second question there are basically two commands that allow you to
to check it out. These are
#show runn and #show version. The second one is better because it displays
the complete info about image set
3640-Old#show version
Cisco Internetwork Operating System Software
IOS (tm) 3600 software (C3640-JS-M), Version 12.1(5)T, MAINTEN
.........
Robert
----- Original Message -----
From: Kenneth Wygand <KWygand@customonline.com>
To: Robert <k_robert@tsp.lviv.ua>
Cc: <ccielab@groupstudy.com>
Sent: Wednesday, July 14, 2004 4:12 PM
Subject: RE: Max-reserved-bandwidth question
Hey Robert,
You wrote:
<snip>
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".
</snip>
What part of your output below gives you the indication that this is the
method the IOS is using to determine how much bandwidth to reserve with the
"bandwidth-percent" command?
Also, how do you know the software version is 12.1(5)T?
Ken
________________________________
From: Robert [mailto:k_robert@tsp.lviv.ua]
Sent: Mon 7/14/2003 6:47 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:
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> >
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>
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