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How can i prioritize packets on  cisco Catalyst 3560 Series switch?

Posted on 2010-08-31
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Last Modified: 2012-05-10
I have a cisco switch 3560, i want to priorities the packets according to the port number in the bellow order:
Priority 1-port:4569
Priority 2-port:8567
Priority 3-other ports...

So what i need a sample configuration that can help me in implementing this rule
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Question by:jadkaram
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bkepford earned 500 total points
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To prioritize based on TCP ports the ports have to flow through a layer 3 interface (an interface with an IP address).  On a switch you mark packets coming into the switch with a precedense to be prioritized they are ordered for output out of the first layer three interface. Here is a configuration to do so if that is the case. First you have to enable qos with the "mls qos" command. Keep in mind this is only to mark the packets flowing through interface fa0/1, on the router you will have to add a service policy to give them priority. The service policy is set to mark packets as they enter the switch.


mls qos
!
class-map match-all PORT8567
 match access-group name PORT8567
class-map match-all PORT4569
 match access-group name PORT4569
!
!
policy-map PRIORITIZE
 class PORT4569
  set dscp cs5
 class PORT8567
  set dscp cs3
!
ip access-list extended PORT4569
 permit tcp any any eq 4569
ip access-list extended PORT8567
 permit tcp any any eq 8567
!
interface FastEthernet0/1
 service-policy input PRIORITIZE

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by:jadkaram
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Thanks for your solution i'll try it but what about udp it works aslo? cos the 4569 is used for udp packets
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by:bkepford
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You have to change the ACL like so for both UDP and TCP.

ip access-list extended PORT4569
 permit tcp any any eq 4569
 permit udp any any eq 4569
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by:jadkaram
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Ok thanks but this rule should be applied on each physcial port on the switch interface FastEthernet0/1
..interface FastEthernet0/48, or is there a way to apply it in one place?
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by:jadkaram
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what for other pakets are they by default lower priority than 4569 and 8567?
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by:bkepford
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Yes it needs to be applied to all interfaces that you expect to have that traffic on. All other traffic will be have a dscp precedence of CS0 and treated as it is now.
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by:jadkaram
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For all my interfaces i have now:
  switchport access vlan 10

So by applying th priority rule to the Vlan 10 it will give me the same result as applying it for each physical port?

What is the best way to verify if my priority rule is taken into consideration?
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by:bkepford
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show policy-map interface
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