Thanks Naren. I have gone through the document and labbed few of the examples
on it using two routers runnig different IOSs, 12.4.15 and 12.4.25, and I can
replicate the differences. I hope I get it.
One of the new features is nested CBWFQ, so using the exampls onthe
documentation we can things like:
policy-map child
class child-c1
bandwidth 400
class child-c2
bandwidth 400
policy-map parent
class parent-c1
bandwidth 1000
service-policy child
class parent-c2
bandwidth 2000
service-policy child
If I try this on 12.4.15 I get an error point ing at the fact that I need
shaping on the parent. So I can achive kind of the same thing with the one
below on 12.4.15 (my head hurts now), I am not getting an error
policy-map child
class child1
bandwidth 20
class child2
bandwidth 10
policy-map parent
class parent1
shape average 40000
service-policy child
class parent2
shape average 32000
service-policy child
Well, it is not quite the same, I know, the first one I am reserving bandwidth
for parent1 in case of congestion, the second one is shaping parent 1 to the
average and withing that shapend traffic I am reserving bandwidth. Hopufully
I'll remember some of this on the day. Thanks again. Fulvio
Date: Wed, 10 Apr 2013 19:10:21 -0700
From: [email protected]
Subject: Re: [OSL | CCIE_RS] CBWFQ Bandwidth Allocation
To: [email protected]; [email protected]
Fulvio,
I would suggest you to go
through
http://www.cisco.com/en/US/prod/collateral/iosswrel/ps6537/ps6558/white_paper_c11-481499.html
It explains
everything about HQF & how is it different from Pre-HQF era.
Please do not confuse HQF with
MQC (Modular Quality of Service). We use MQC in codes prior to 12.4(20)T as
well.
I am not sure what IOS is used in Lab, however, it
will be a good idea to have at least one router in your rack set to the same
IOS as routers in LAB. This will surely help you prepare better & avoid any
unforeseen issues.
Thanks.
Naren
From: Fulvio allegretti <[email protected]>
To: Narendra Naukwal <[email protected]>; "[email protected]"
<[email protected]>
Sent: Thursday, 11 April 2013 12:34 AM
Subject: RE: [OSL | CCIE_RS] CBWFQ Bandwidth Allocation
Right, Thanks Naren. I am running 12.4.24 so I "benefit" from this feature. I
believe in the lab the routers run 12.4.15, so HQF won't be available. Are we
saying that without HQF we can't do hierarchical traffic policy? Do I have to
downgrade my rack and start my QoS testing from scratch ;-(?
Fulvio
From: [email protected]
To: [email protected]; [email protected]
Subject: RE: [OSL | CCIE_RS] CBWFQ Bandwidth Allocation
Date: Wed, 10 Apr 2013 07:49:48 +0000
Just saw this reply by Naren (nice picture by the way), I'll check the
documentation later today, thanks. Fulvio
Date: Tue, 9 Apr 2013 18:08:40 -0700
From: [email protected]
Subject: Re: [OSL | CCIE_RS] CBWFQ Bandwidth Allocation
To: [email protected]; [email protected]
Hi Fulvio, This limit was removed with introduction to HQF (Hierarchical
Queueing Framework) This was introduced in with
12.4(20)T. Here is a snippet from
http://www.cisco.com/en/US/docs/ios/qos/configuration/guide/qos_frhqf_support.html
Policy Map and Interface Bandwidth In HQF, a policy map can reserve up to 100
percent of the interface bandwidth. If you do not assign an explicit bandwidth
guarantee to the class-default class, you can assign a maximum of 99 percent of
the interface bandwidth to user-defined classes and reserve the other 1percent
for the class-default
class.
--------------------------------------------------------------------------------Note
If you are migrating to Cisco IOS Release 12.4(20)T and the configured policy
map allocates 100 percent of the bandwidth to the user-defined classes, an
error message appears in the console after booting the HQF image. The message
indicates that the allocated bandwidth exceeds the allowable amount, and the
service policy is rejected. In HQF, you must reconfigure the policy to account
for the minimum 1 percent bandwidth guaranteed for the class-default. Then you
can apply a service policy to the interface.
Hope this helps! Regards,Naren
From: Fulvio allegretti <[email protected]>
To: "[email protected]" <[email protected]>
Sent: Wednesday, 10 April 2013 4:26 AM
Subject: [OSL | CCIE_RS] CBWFQ Bandwidth Allocation
Hi all,
I know that the sum of reserved bandwidth on CBWFQ cannot exceed 75 % of the
interface bandwidth, and if I try to apply a policy to an interface where I
have reserved more than 75% I should get something like this:
I/f FastEthernet0/0 class RTP
requested bandwidth 9000 (kbps), available only 7500 (kbps)
but I just can't make this message come up, for some reason I am able to
reserve up to 99M on 100 M interface. I am sure am missing something simple
here and just can't see the wood for trees at this time at night. Can you help?
Thanks, Fulvio
R4#sh policy-map
Policy Map VOIP
Class RTP
priority 99000 (kbps)
R4#sh run int fa 0/0
Building configuration...
Current configuration : 145 bytes
!
interface FastEthernet0/0
ip address 150.100.40.4 255.255.255.0
ip ospf mtu-ignore
duplex auto
speed auto
service-policy output VOIP
end
R4#sh policy-map int fa 0/0
FastEthernet0/0
Service-policy output: VOIP
queue stats for all priority classes:
queue limit 64 packets
(queue
depth/total drops/no-buffer drops) 0/0/0
(pkts output/bytes output) 0/0
Class-map: RTP (match-all)
0 packets, 0 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: protocol rtp
Priority: 99000 kbps, burst bytes 2475000, b/w exceed drops: 0
Class-map: class-default (match-any)
77 packets, 6651 bytes
5 minute offered rate 0 bps, drop rate 0 bps
Match: any
queue limit 64 packets
(queue depth/total drops/no-buffer drops) 0/0/0
(pkts output/bytes output) 77/7624
R4#sh int fa 0/0 | in BW
MTU 1500 bytes, BW 100000 Kbit/sec, DLY 100 usec,
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_______________________________________________
For more information regarding industry leading CCIE Lab training, please visit
www.ipexpert.com
Are you a CCNP or CCIE and looking for a job? Check out
www.PlatinumPlacement.com
http://onlinestudylist.com/mailman/listinfo/ccie_rs
