From: John Matijevic (matijevi@bellsouth.net)
Date: Sun Mar 14 2004 - 11:27:34 GMT-3
Hello William,
I believe that you would want to use the bandwidth remaining-percent,
only if you have configured the bandwidth-percent. Because then if you
have allocated bandwidth above the 75%. Then you decide how the
remaining percentage will be allocated. Here is an example from Cisco:
the first example, policy-map foo guarantees 30 percent of the bandwidth
to class bar and 60 percent of the bandwidth to class baz.
policy-map foo
class bar
bandwidth percent 30
class baz
bandwidth percent 60
Applying this policy to a 1 Mbps link means 300 kbps is guaranteed to
class bar, and 600 kbps is guaranteed to class baz. Importantly, 100
kbps is leftover for class-default. If class-default does not need it,
the unused 100 kbps is available for use by class bar and class baz. If
both classes need the bandwidth, they share it in proportion to the
configured rates. In this configuration, the sharing ratio is 30:60 or
1:2.
This next example combines the bandwidth percent command with the
bandwidth remaining percent command to explicitly control the allocation
of the unused 100 kbps of bandwidth. With this configuration, the 100
kbps is shared between class bar and baz in an 80:10 (8:1) ratio.
policy-map foo
class bar
bandwidth percent 30
bandwidth remaining percent 80
class baz
bandwidth percent 60
bandwidth remaining percent 10
Hopefully this helps clarify :)
As far as not being able to use the commands together I think, it
probably is an IOS issue, as I have 12.2 running at home, and I don't
even see the bandwidth remaining-percent. I would try to see if it works
on another 12.2 IOS version.
Sincerely,
John Matijevic
-----Original Message-----
From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
William Chen
Sent: Saturday, March 13, 2004 10:29 PM
To: Brian McGahan; alsontra@hotmail.com; 'Tom Wojahn'
Cc: ccielab@groupstudy.com
Subject: Re: converting custom queue to cbwfq
Dear Brian,
I tried your example of using bandwidth remaining percent command,
but I
can't make it working.
> Now suppose that you want class C to get more of the default class
> when there is saturation of everything except the default class. This
is
> the case where it is appropriate to configure the "bandwidth remaining
> percent" such as follows:
>
> Policy-map XYZ
> Class A
> Bandwidth percent 30
> bandwidth remaining percent 25
> Class B
> Bandwidth percent 20
> bandwidth remaining percent 25
> Class C
> Bandwidth percent 10
> bandwidth remaining percent 50
>
### My Testnig:
R1#sh ver
Cisco Internetwork Operating System Software
IOS (tm) 3600 Software (C3640-JK9O3S-M), Version 12.2(15)T7, RELEASE
SOFTWARE (fc2)
......
R1#sh run
......
!
class-map match-all P1
match ip precedence 1
class-map match-all P2
match ip precedence 2
class-map match-all P3
match ip precedence 3
!
!
policy-map myPolicy
class P1
bandwidth percent 30
class P2
bandwidth percent 20
class P3
bandwidth percent 10
!
......
R1#conf t
Enter configuration commands, one per line. End with CNTL/Z.
R1(config)#policy-map myPolicy
R1(config-pmap)#class P1
R1(config-pmap-c)#bandwidth remaining percent 25
All classes with bandwidth should have consistent units
....
It seems I can only apply either "bandwidth percent" or "bandwidth
remaining percent". Moreover, what is the difference between using
"bandwidth percent" with "bandwidth remaing percent" alone, if the
"bandwidth remaining percent" is to reserved bandwidth out of
class-default
(i.e 100% if I don't make any reservation before)?
Best Regards,
William Chen
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