QoS questions

[danilo.cam]

class qos5 is for voice traffic from downstream switch.

class qos2 is for all other transit traffic from downstream switch
Interface g0/0 goes to WAN link.

Have some questions:
1- Since the service-policy wanN-L is inside a class-default, will all traffic from this class will it be remarked as BE, or will it honor the markings from wanN-L ?

2- Since all transit traffic goesto qos2 and qos5, what kind of traffic will qos1 and class-default in wanN-L policy map will match?

Not sure, but can it be traffic destined to the router itself, like Telnet, SSH, Routing protocols ?

3- It is a good idea to insert a policy statement is class qos5?, qos5 is the is a priority queue for voice traffic.

-----------------------

policy-map Shape3072
  class class-default
    shape average 3072000
    service-policy wanN-L

policy-map wanN-L
  class qos5
    priority 512
      police 512000 96000 192000 conform-action transmit  exceed-action drop  violate-action drop
  class qos2
    bandwidth 2048
      police 2048000 384000 768000 conform-action transmit  exceed-action set-dscp-transmit cs1 violate-action set-dscp-transmit 8
  class qos1
    bandwidth 512
  class class-default
    fair-queue

int g0/0
  service-policy out Shape3072

Thanks in advance for answering my questions!!!

[Philip D'Ath]

1. Traffic markings from Shape3072 will be preserved inside of wanN-L unless WAN-L re-marks the traffic.

2. If traffic matches the class qos5, then the qos5 action will be applied and no further processing will be done.  If qos5 does not match then qos2 will be checked, and if matched, that action will be applied.  If qos5 does not match then qos1 will be checked, and if matched that action will be applied.  And lastly if there are no matches class-default will be applied.

3. It is fine as it is.  I would not normally have a police action myself, as that would cause VoIP traffic to be dropped if it overflows, but that is up to you.