Egress Sap Forwarding Class And Forwarding Profile Overrides; Sap Egress Qos Policy Modifications; Hardware Support; Service Egress And Ingress Qos Policies - Alcatel-Lucent 7950 Quality Of Service Manual

Egress SAP Forwarding Class and Forwarding Profile Overrides

An access egress packet's forwarding class can be changed to redirect the packet to an alternate
queue than the ingress forwarding class determination would have used. An access egress packet's
profile (in or out) can also be changed to modifying the congestion behavior within the egress
queue. In both cases, egress marking decisions will be based on the new forwarding class and
profile as opposed to the egress forwarding class or profile. The exception is when ingress
remarking is configured. An ingress remark decision will not be affected by egress forwarding
class or egress profile overrides.

SAP Egress QoS Policy Modifications

The SAP egress QoS policy allows reclassification rules that are used to override the ingress
forwarding class and profile of packets that egress a SAP where the QoS policy is applied. Only
IP-based reclassification rules are supported.
IP precedence, DSCP and IP quintuple entries can be defined, each with an explicit forwarding
class or profile override parameters. The reclassification logic for each entry follows the same
basic hierarchical behavior as the classification rules within the SAP ingress QoS policy. IP
precedence and DSCP have the lowest match priority while the IP criteria (quintuple) entries have
the highest. When an optional parameter (such as profile) for IP precedence or DSCP entries is not
specified, the value from the lower priority IP quintuple match for that parameter is preserved. If
the IP precedence values overlap with DSCP values in that they will match the same IP header
TOS field, the DSCP entry parameters will override or remove the IP precedence parameters.
When none of the matched entries override a parameter, the ingress classification is preserved.

Hardware Support

The egress SAP forwarding class and forwarding profile override is only supported on SAPs
configured on IOM2 and IOM3 modules. If a SAP egress QoS policy with forwarding class and
forwarding profile overrides are applied to a SAP on an IOM other than the IOM2 and IOM3 (such
as an IOM1), no error message is generated, but the forwarding class and forwarding profile
override portion of the SAP egress QoS Policy is ignored and has no effect.
7950 XRS Quality of Service Guide

Service Egress and Ingress QoS Policies

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