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Cisco ASA Qos example question

Posted on 2013-11-20
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Last Modified: 2013-11-26
hello Experts
on the firewall i can define 2 class, classA and classB, my circuit bandwidth is 120Mb, i want guarantee 100Mb for classA and 20Mb for classB, guarantee is not restriction i mean, for example classA is not using the circuit, classB could reach 120Mb, and same situation if classB is not using the circuit, if classA and classB using the circuit at the same time and the bandwidth is not full yet, and classA is using 40Mb for example, classB bandwidth could over 20Mb.

does this is possible configure on ASA 8.4 version?
if yes show me the example please.
thank you
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Question by:beardog1113
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Expert Comment

by:asavener
ID: 39669502
My understanding is that this is not an available feature on the ASA.

http://www.cisco.com/en/US/docs/security/asa/asa84/configuration/guide/conns_qos.html#wp1064207

The ASA supports the following QoS features:

•Policing—To prevent individual flows from hogging the network bandwidth, you can limit the maximum bandwidth used per flow. See the "Information About Policing" section for more information.

•Priority queuing—For critical traffic that cannot tolerate latency, such as Voice over IP (VoIP), you can identify traffic for Low Latency Queuing (LLQ) so that it is always transmitted ahead of other traffic. See the "Information About Priority Queuing" section for more information.

•Traffic shaping—If you have a device that transmits packets at a high speed, such as a ASA with Fast Ethernet, and it is connected to a low speed device such as a cable modem, then the cable modem is a bottleneck at which packets are frequently dropped. To manage networks with differing line speeds, you can configure the ASA to transmit packets at a fixed slower rate. See the "Information About Traffic Shaping" section for more information.
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Author Comment

by:beardog1113
ID: 39673363
hello
then since in my case this type Qos is impossible right?

thanks
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Expert Comment

by:asavener
ID: 39673527
It is not a QoS feature available on the ASA platform.  Cisco routers can perform that type of QoS, so if you have a Cisco router (or other QoS-capable platform) in line with the traffic flow, you might be able to accomplish what you're trying to do.
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Author Comment

by:beardog1113
ID: 39673573
hello
then can you considering i have replace the ASA with a router, and could you show me the example of configuration on a Cisco router for my case?

thank you
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Accepted Solution

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asavener earned 500 total points
ID: 39673606
ip access-list extended ClassA
permit ip a.b.c.0 0.0.0.255 any

ip access-list extended ClassB
permit ip x.y.z.0 0.0.0.255 any

class-map ClassA match-any
match access-group ClassA

class-map ClassB match-any
match access-group ClassB

policy-map QoS
class ClassA
bandwidth <bandwidth reservation in kbps>
class ClassB
bandwidth <bandwidth reservation in kbps>

interface <interface_name>
service-policy output QoS
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Author Comment

by:beardog1113
ID: 39673623
hello
bandwidth <bandwidth reservation in kbps>

as my understanding the bandwidth parameter is this class could not over defined bandwidth, not reservation for this class right?

let me know if i am wrong.

thanks
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Expert Comment

by:asavener
ID: 39674570
No, it's a bandwidth reservation, not a cap.  To cap the bandwidth you would use the keyword "police" (not recommended) or "shape" (recommended) in place of "bandwidth."

http://www.cisco.com/en/US/docs/ios/12_2/qos/configuration/guide/qcfmcli2.html#wp1021573

Router(config-pmap-c)# bandwidth {bandwidth-kbps | percent percent}
      

(Optional) Specifies a minimum bandwidth guarantee to a traffic class in periods of congestion. A minimum bandwidth guarantee can be specified in kbps or by a percentage of the overall available bandwidth.
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Author Closing Comment

by:beardog1113
ID: 39679689
good, thanks
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