Nortel Networks 5510 Classification, Untrusted Ports, Unrestricted Ports, IP Classifier Elements

Filters and QoS Configuration for ERS 5500
Technical Configuration Guide	v2.0	NN48500-559

polices. The ‘well-know’ DSCP values can be viewed by using the NNCLI command ‘show qos eqressmap’.

•Untrusted Ports

o 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.

•Unrestricted Ports

o 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.

Table 1: Default QoS Action

Type of Filter	Action	Trusted	Untrusted	Unrestricted
			• Tagged--Updates to 0
		Does not	(Standard)	Does not
	DSCP		• Untagged--Updates using
		change		change
IPv4 filter criteria			mapping table and port’s
			default value
or Layer 2 filter
criteria matching
IPv4
		Updates
	IEEE	based on	Updates based on DSCP	Does not
		DSCP
	802.1p		mapping table value	change
		mapping
		table value

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.

ƒLayer 2 Classifier Elements

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

o Destination MAC with mask to filter on complete or partial MAC addresses o VLAN ID – can be a range

o Tagged or untagged packets o EtherType

o 802.1p priority

•IP Classifier Elements

o Source IPv4/v6 host or subnet

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