From: Wittawat H. (wittawat.h@tangerine.co.th)
Date: Sun Nov 02 2008 - 02:41:10 ARST
Dear Daniel Kutchin,
It's a kind of you to help me. :)
I have already completely understood about this configuration that
policy-map named "parent" have to properly configured with classed-based
shaping otherwise, CBWFQ hierarchy will not work !!!
However, when classed-based shaping hierarchical policy map was configured,
each class within the policy-map named "child" will share the TOTAL
bandwidth which is already shaped by classed-based shaping process.
P.S. If I misunderstnad, please do not hesitate to let me know. :)
Best Regards,
Wittawat H.
On 11/2/08, Daniel Kutchin <daniel@kutchin.com> wrote:
>
> I verified the Book to be correct:
>
> Each class in the child policy-map references the TOTAL bandwidth
> available.
>
> The parent policy-map determines the TOTAL available bandwith, which is
> 384k
>
> Issue the command
> "sho policy-map int" to see how the bandwidth is shared out
>
> Router(config-if)#do sh policy-map int s0/0 ou
>
> Serial0/0
>
> Service-policy output: parent
>
> Class-map: class-default (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
> Traffic Shaping
> Target/Average Byte Sustain Excess Interval Increment
> Rate Limit bits/int bits/int (ms) (bytes)
> 384000/384000 2400 9600 9600 25 1200
>
> Adapt Queue Packets Bytes Packets Bytes Shaping
> Active Depth Delayed Delayed Active
> - 0 0 0 0 0 no
>
> Service-policy : child
>
> Class-map: x (match-all) <---
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: ip precedence 5
> Queueing
> Output Queue: Conversation 41
> Bandwidth 50 (%) <---
> Bandwidth 192 (kbps) Max Threshold 64 (packets)<---192k
> (pkts matched/bytes matched) 0/0
> (depth/total drops/no-buffer drops) 0/0/0
>
> Class-map: y (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: ip precedence 2
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Match: ip precedence 3
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Match: ip precedence 4
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Queueing
> Output Queue: Conversation 42
> Bandwidth 20 (%) <---
> Bandwidth 76 (kbps) Max Threshold 64 (packets)<---76k
> (pkts matched/bytes matched) 0/0
> (depth/total drops/no-buffer drops) 0/0/0
>
> Class-map: z (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: ip precedence 0
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Match: ip precedence 1
> 0 packets, 0 bytes
> 5 minute rate 0 bps
> Queueing
> Output Queue: Conversation 43
> Bandwidth 10 (%) <---
> Bandwidth 38 (kbps) Max Threshold 64 (packets)<--38k
> (pkts matched/bytes matched) 0/0
> (depth/total drops/no-buffer drops) 0/0/0
>
> Class-map: class-default (match-any)
> 0 packets, 0 bytes
> 5 minute offered rate 0 bps, drop rate 0 bps
> Match: any
> Router(config-if)#
>
>
>
> Daniel
>
>
> -----Original Message-----
> From: nobody@groupstudy.com [mailto:nobody@groupstudy.com] On Behalf Of
> Wittawat H.
> Sent: Samstag, 1. November 2008 18:03
> To: ccielab
> Subject: QoS Shaping Hierarchical Policy Maps issue !!!
>
> Dear All,
>
> Please help me to clarify this configuration that stated below.
>
> policy-map child
> class x
> bandwidth percent 50
> class y
> bandwidth percent 20
> class z
> bandwidth percent 10
>
> policy-map parent
> class class-default
> shape average 384000
> service-policy child
>
> int s0/0
> service out parent
>
> In my opinion, I think that traffic that going out of interface serial 0/0
> is rate-limited to 384 kbps total. and then
>
> class x should get minimum bandwidth guaranteed to 384 kbps x 0.5,
> class y should get minimum bandwidth guaranteed to (384 kbps x 0.5) x 0.2
> class z should get minimum bandwidth guaranteed to ((384 kbps x 0.5) x 0.2)
> x 0.1
>
> because I used "bandwidth percent" command, not "bandwidth remaining
> percent" one.
>
> But, according to "Implementing Cisco Quality of Service" volume 2, version
> 2.2 study guide, it stated that
>
> class x get minimum bandwidth guaranteed to 384 kbps x 0.5 = 192 kbps
> class y get minimum bandwidth guaranteed to 384 kbps x 0.2 = 76.8 kbps
> class z get minimum bandwidth guaranteed to 384 kbps x 0.1 = 38.4 kbps
>
> So, these result made me confusing about "bandwidth percent" command
> accompany with shaping hierarchical policy map.
>
> Thank you in advance.
>
> Best Regards,
> Wittawat H.
>
>
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