[c-nsp] QoS Cisco Serie 800 and 1800

Fri Nov 20 12:51:01 EST 2009

Thanks Clue for your quick answer.

In the original mail I didn't mention it, but I applied the service-policy
to the PVC like you said. (Below attach the complete configuration for both
cases).

Another issue is that Cisco's 800 and 1800 series routers only have 2 level
of prioritization. Cisco's routers allow to configure a priority queue and
CBWFQ (class base weighted fair queue) but does not has the flexibly to
specify a scheduler policy or any other queuing policies.

I think that weighted fair queue will leave as dead end, I think the way to
follow is a strict priority queuing with a customizable scheduler policy.
I'm looking for a way to do that in Cisco's routers.

I'll appreciate any help you can give me.

Cisco 878/877
--------------------------------------
class-map match-all GOLD
 match access-group name GOLD_ACL
class-map match-all SILVER
 match access-group name SILVER_ACL

policy-map QoS_POLICY
 class GOLD
  priority percent 25
  police cir percent 25 pir percent 25
  set dscp ef
 class SILVER
  set dscp af41
   bandwidth percent 50
   shape average percent 75
 class class-default
   fair-queue
   set dscp af12
   bandwidth percent 25

interface ATM0
 no ip address
 load-interval 30
 no atm ilmi-keepalive
 max-reserved-bandwidth 100
!
interface ATM0.35 point-to-point
 description INTERFAZ DE ACCESO
 ip address x.x.x.x 255.255.255.254
 atm route-bridged ip
 pvc 0/35
  vbr-nrt 576 576
  oam-pvc 0
  encapsulation aal5snap
  service-policy output QoS_POLICY

Cisco 1841
--------------------------------------

class-map match-all GOLD
 match access-group name GOLD_ACL
class-map match-all SILVER
 match access-group name SILVER_ACL

policy-map QoS_POLICY
 class GOLD
  priority percent 25
  police cir percent 25 pir percent 25
  set dscp ef
 class SILVER
  set dscp af41
   bandwidth percent 50
   shape average percent 75
 class class-default
   fair-queue
   set dscp af12
   bandwidth percent 25

policy-map SHAPER
 class class-default
    shape average 1000000
  service-policy QoS_POLICY
!
!
!
interface FastEthernet0/0
 description INTERFAZ DE ACCESO
 no ip address
 load-interval 30
 duplex auto
 speed auto
!
interface FastEthernet0/0.100
 encapsulation dot1Q 100
 ip address x.x.x.x 255.255.255.252
 service-policy output SHAPER

Thanks,

2009/11/20 Clue Store <cluestore at gmail.com>

> Hi Alejandro,
>
> If you're doing this with xDSL, you will have to apply the service-policy
> to the PVC for outgoing to make it work. Here's an example of what I use. I
> know your class-maps and policy-maps are different, but you should be able
> to get the point.
>
> class-map match-any VoIP
>  match ip rtp 16384 16383
>  match access-group name VoicePorts
>
> policy-map Voice
>  class VoIP
>   priority percent 75
>
>  class class-default
>   fair-queue
>
>
> interface ATM0.1 point-to-point
>  pvc 1/100
>   vbr-rt 384 384
>   tx-ring-limit 3
>   service-policy output Voice
>
>
> ip access-list extended VoicePorts
>  permit udp any host x.x.x.x range 22026 62025
>  permit udp any host x.x.x.x range 22026 62025
>
>
>
>
> HTH,
> Clue
>
> On Fri, Nov 20, 2009 at 9:26 AM, Alejandro Selios <aselios at gmail.com>wrote:
>
>> Hi,
>>
>> I want to configure QoS on a Cisco's 800 and 1800 series router and I
>> couldn't make it work the way I want. I've configured three classes of
>> service called GOLD, SILVER and BRONZE, designed for low latency, low loss
>> and data respectively.
>>
>> * I want the GOLD class to have a maximum bandwidth of 25%, even if there
>> is
>> traffic in the other classes.
>>
>> * The SILVER class has a minimum bandwidth of 50% and, if there's no
>> traffic
>> in the GOLD queue, I want this class to take the available bandwidth which
>> is not used by the GOLD class. Thats means that the SILVER class has a 50%
>> of assured bandwidth and can increase to a maximum of 75% of the total
>> bandwidth.
>>
>> * The BRONZE class has no assured bandwidth and can only take the
>> bandwidth
>> which is not used for the other classes.
>>
>> The problem is that with Cisco's QoS tools I have not reached the desired
>> goal. I have tried with different configurations and IOS and I couldn't
>> get
>> any successful result . Below I attach the policy configuration that I
>> have
>> tried (just to give you an example).
>>
>> Is there any way in which I can achieve the behavior that was described
>> above?.
>>
>> Thanks in advance.
>>
>>
>> Standard Configuration
>> -------------------------------------
>>
>> policy-map QoS_POLICY
>>  class GOLD
>>   priority percent 25
>>   police cir percent 25 pir percent 25
>>   set dscp ef
>>  class SILVER
>>   set dscp af41
>>    bandwidth percent 50
>>    shape average percent 75
>>  class class-default
>>    fair-queue
>>    set dscp af12
>>    bandwidth percent 25
>>
>>
>>
>>
>> Hierarchical Configuration
>> ---------------------------------------------
>> policy-map GOLD+SILVER
>>  class GOLD
>>    priority percent 33
>>    police rate percent 33
>>  class class-default
>>    fair-queue
>>
>> policy-map QOS
>>  class GOLD+SILVER
>>    shape average percent 75
>>    bandwidth percent 75
>>    service-policy GOLD+SILVER
>>  class class-default
>>    fair-queue
>>
>>
>> Note: This configuration was applied in a subinterface (xDSL, 802.1q
>> ethernet) and for the outgoing traffic.
>> _______________________________________________
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>>
>
>