4321 QoS Question

[ALIAOF_]

I have the following QoS on a 2901, trying to put the same on 4321 with IOS XE running.  All works but I can't just drop it under "class BLOCK".  There are different options set us shaping, policing, set etc.  What would be the best way to achieve the similar results?  Thank you.

policy-map VOIP_QOS
 class Voice
  priority percent 40
  set ip dscp ef
 class BLOCK
  drop
 class AF41-Plat
  bandwidth remaining percent 25
 class AF31-Gold
  set ip dscp af31
  bandwidth remaining percent 50
 class AF21-Silver
  set ip dscp af21
  bandwidth remaining percent 15
  queue-limit 300 packets
 class AF11-Scavenger
  set ip dscp af11
  bandwidth remaining percent 5
  queue-limit 300 packets
 class class-default
  bandwidth remaining percent 5
  queue-limit 300 packets
  set dscp default
policy-map SUBINT_PARENT
 class class-default
  shape average percent 100
   service-policy VOIP_QOS

[Elliott Willink · Accepted solution]

Police comes with conform-action drop. I guess the much wordier version of drop :)

 class BLOCK

    police 8000 conform-action drop exceed-action drop violate-action drop

[ALIAOF_]

Got it thank you, so I guess with IOS XE I will need to put some number in there and 8000bps is the minimum.

[Elliott Willink]

Yep, well it really doesn't matter what you put in the minimum as it is dropping regardless of the police value.

Theoretically (I'm assuming..) this is more processor intensive than a simple drop command, as it needs to compare the traffic flow to the police value, but none of this is a concern on the 4000 series as you are license limited, not processor limited.

[ALIAOF_]

Thank you one last question, when you say license limited are you talking about the throughput ?

[Elliott Willink · Accepted solution]

Yep, so on your platform you are license limited to 50mbit or 100mbit - however the router itself is far more powerful than that. Unless there is an error condition you will never enable so many features that you "overload" your router - Your limit is purely in the license you have paid for.