Table 1: Default Qos Action - Nortel 5530 Engineering Manual

Ethernet routing switch

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Table of Contents

Filters and QoS Configuration for ERS 5500

Technical Configuration Guide

polices. The 'well-know' DSCP values can be viewed by using the NNCLI command

'show qos eqressmap'.

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Untrusted Ports

Assumes that all traffic coming into the port is suspect. Therefore, the DSCP field of

any traffic that enters the Ethernet Routing Switch 5500 from an Untrusted Port is re-

marked. For untagged packets, the default classifier is used to change the DSCP.

This results in a DSCP value determined by the CoS-to-DSCP mapping table using

the default 802.1p priority of the interface where the packet is received. For tagged

packets, the 802.1p value is determined by CoS-to-DSCP mapping table using the

best effort DSCP, which is 0.

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Unrestricted Ports

Does not assume anything about the origin of the incoming traffic. You may assign

an action to set the DSCP or not to set the DSCP; it's up to you. This allows you to

manipulate the DSCP value based upon the filter criteria, and not upon the point of

origin.

The following table displays a summary of the role combination capabilities.

Type of Filter

Action

DSCP

IPv4 filter criteria

or Layer 2 filter

criteria matching

IPv4

IEEE

802.1p

Classification

Classification identifies the traffic flow that requires QoS management. The traffic flow may be

identified by the Layer 2 or IP content of the frame using any of the elements shown below.

Layer 2 Classifier Elements

Source MAC with mask to filter on complete or partial MAC addresses

Destination MAC with mask to filter on complete or partial MAC addresses

VLAN ID – can be a range

Tagged or untagged packets

EtherType

802.1p priority

•

IP Classifier Elements

Source IPv4/v6 host or subnet

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