Filters and QoS Configuration for ERS 5500

 

 

Technical Configuration Guide

v2.0

NN48500-559

 

 

Max = 11

4

7

Min = 100

 

 

Max = 111

8

15

Min = 1000

 

 

Max = 1111

80

95

Min = 10100000

 

 

Max = 10111111

3.4Policies

Packets received on an interface are matched against all policies associated with that interface. Hence, all policies are applied to the packet.

Policy precedence – the precedence attribute is used to specify the evaluation order of policies that apply to the same interfaces. Policies with higher precedence (i.e., a larger value) are applied before those with lower precedence (i.e., a smaller value). Precedence values must be unique for all policies being applied to the same interface role.

If one policy associated with the specific interface only specifies a value updating the DSCP value while another policy associated with that same interface only specifies a value for updating the 802.1p user priority value, both of these actions occur.

If two policies on the specified interface request that the DSCP be updated but specify different values - the value from the policy with the higher precedence will be used.

Referenced component conflicts - action or meter criteria can be specified through individual classifier blocks. When a policy references a classifier block and members of the referenced block identify their own action or meter criteria, action and meter data must not be specified by the policy.

The actions applied to packets include those actions defined from user-defined policies and those actions defined from system default policies. The user-defined actions always carry a higher precedence than the system default actions. This means that, if user- defined policies do not specify actions that overlap with the actions associated with system default policies (for example, the DSCP and 802.1p update actions installed on untrusted interfaces), the lowest precedence, default policy actions will be included in the set of actions to be applied to the identified traffic.

The following table displays the ERS 5500 default policy action with corresponding drop actions. The drop action specifies whether a packet should be dropped, not dropped, or deferred. A drop action of deferred-Pass specifies that a traffic flow decision will be deferred to other installed policies.

Table 3: Default Policy Drop Action

ID

Name

Drop

Update DSCP

User Priority

Drop

 

 

 

 

 

Precedence

1

Drop_Traffic

drop

Ignore

Ignore

highDropPrec

2

Standard_Service

Don’t Drop

0x00

Priority 0

highDropPrec

3

Bronze_Service

Don’t Drop

0x0a

Priority 2

lowDropPrec

4

Silver_Service

Don’t Drop

0x12

Priority 3

lowDropPrec

5

Gold_Service

Don’t Drop

0x1a

Priority 4

lowDropPrec

6

Platinum_Service

Don’t Drop

0x22

Priority 5

lowDropPrec

7

Premium_Service

Don’t Drop

0x2e

Priority 6

lowDropPrec

8

Network_Service

Don’t Drop

0x30

Priority 7

lowDropPrec

9

Null_Service

Don’t Drop

ignore

ignore

lowDropPrec

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Nortel Networks 5530, 5520, 5510 manual Policies, Default Policy Drop Action