CBWFQ-like PFC QoS Confuguration

[yuri.volkov]

Could anyone help me with Cisco 6500 QoS configuration?

I would like to divide bandwidth of an interface in ratio 70/30. CBWFQ configuration on a router is quite straightforward and simple:

ip access-list enxtended ACL

   permit ip 10.0.0.0 0.0.0.255 any

class-map Class-Map

   match access-group name ACL

policy-map Policy-Map

   class Class-Map

      bandwidth percent 70

   class class-default

      bandwidth percent 30

interface Gi0/0

   service-policy output Policy-Map

But it's not clear for me how the same could be configured on the Policy Feature Card (PFC3).

Thanks in advance!

[Edison Ortiz]

CBWFQ isn't supported on LAN ports but you can configure and attach the policy to a WAN port (SIP/SPA or FlexWAN).

[yuri.volkov]

Unfortunately, QoS has to be applied to a LAN port with a DSL modem connected to it.

[Jon Marshall · Accepted solution]

As Edison says for LAN ports you need to use PFC QOS.

You have a couple of options -

1) You can use policing on the port

or

2) perhaps a better solution is to allocate bandwidth on the port to specific queues and then assign the packets you want to the relevant queue. This is dependant on the queue structure of the module you are using. You would also need to mark the packets as you map CoS values to queues.

Here is a link to config guide for PFC QOS on 6500. I have linked to the specific part about allocating bandwidth to queues but you will also need to look at marking the packets as well. The chapter also covers policing if you decide that is your preferred solution but be aware that policing is quite "severe" on traffic that exceeds the limit -

6500 PFC QOS

Jon

[yuri.volkov]

Thank you very much for the link. After having read right things in the right manual PFC QoS doesn't seem to be so complicated for me as before.

[yuri.volkov]

   Here my PFC QoS configuration. I don't know whether this configuration is right or wrong, but the only result i have got is that traffic from host 10.0.0.2 consumes more bandwidth than traffic from other hosts. Intended proportion was 70/30 Mbps, actual proportion ranges from 85/15 to 55/45 (according to "MikroTik Bandwidth Test").

Configuration:

mls qos

ip access-list extended qos-acl

   permit ip 10.0.0.2 any

class-map match-all qos-cm
   match access-group name qos-acl

policy-map qos-pm
   class qos-cm
      set precedence 5
   class class-default
      set precedence 0

interface GigabitEthernet2/20

   ip address ...

   bandwidth 100000

   wrr-queue bandwidth percent 0 30 70
   wrr-queue cos-map 2 1 0 1 2 3 4 6
   wrr-queue cos-map 3 1 5
   priority-queue cos-map 1 7
   service-policy output qos-pm

show queueing interface g2/20:

   Interface GigabitEthernet2/20 queueing strategy:  Weighted Round-Robin

   Port QoS is enabled

   WRR bandwidth ratios:    0[queue 1]  30[queue 2]  70[queue 3]

    queue thresh cos-map
    ---------------------------------------
    2     1      0 1 2 3 4 6

    3     1      5
    4     1      7

show mls qos maps cos-dscp:

   cos:   0  1  2  3  4  5  6  7
   -----------------------------
   dscp:  0  8 16 24 32 40 48 56

show mls qos ip g2/20:

   [In] Default. [Out] Policy map is qos-pm
   QoS Summary [IPv4]: (* - shared aggregates, Mod - switch module)

      Int Mod Dir  Class-map DSCP  Agg  Trust Fl   AgForward-By   AgPoliced-By
                                        Id         Id
   ---------------------------------------------------------------------------
   Gi2/20   1  In    Default    0    0*    No  0   259646294425              0
   Gi2/20   1 Out     qos-cm   40    1     --  0      373061252              0
   Gi2/20   1 Out class-defa    0    2     --  0      124567545              0