QoS: Classification, policing and applying policy

Things to note

1. Queuing: Can only be applied outbound of an interface.

2. Shaping: Can only be applied outbound of an interface.

3. Policing: Can be applied either inbound or outbound of an interface.

4. Policy can only be applied in one direction and on only one interface.

Classification

class-map match-all vlan10->http
match protocol http
match vlan  10

HTTP traffic originated from vlan 10 to AS 65002 will be classified

Policy

policy-map vlan10->http-policy
class vlan10->http
police 200000
class class-default
fair-queue
random-detect

HTTP traffic originated from vlan 10 will only allow to use 200kbps, if this is conformed the traffic is allowed else it’s dropped. Any other traffic that is not HTTP from Vlan10 will be applying WRED.

Apply policy on an interface

interface FastEthernet0/0
ip address 209.65.200.225 255.255.255.252
ip access-group public-only out
ip nat outside
ip virtual-reassembly
duplex auto
speed auto
service-policy output vlan10->http-policy
end

Show class-map

Class Map match-all vlan10->http (id 3)
Match protocol http
Match vlan  10

Class Map match-any class-default (id 0)
Match any

Show policy-map

Policy Map vlan10->http-policy
Class vlan10->http
police cir 200000 bc 6250
conform-action transmit
exceed-action drop
Class class-default
fair-queue
packet-based wred, exponential weight 9

class    min-threshold    max-threshold    mark-probablity
———————————————————-
0       –                –                1/10
1       –                –                1/10
2       –                –                1/10
3       –                –                1/10
4       –                –                1/10
5       –                –                1/10
6       –                –                1/10
7       –                –                1/10

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