Nortel business policy switch 2000, User Manual

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Chapter 4 Policy-enabled networks 287
Using the Business Policy Switch 2000 Version 2.0
— Layer 4 destination port number
— Ingress port number
• Layer 2 packets
— VLAN ID number
— IEEE 802.1q tag presence
— EtherType, which is the Layer 3 protocol type (such as AppleTalk)
— IEEE 802.1p user priority values
— Ingress port number
— For EtherType IP:
— DSCP value
— IP protocol type (such as TCP/UDP)
— TCP/UDP source port range
— TCP/UDP destination port range
Summary of actions
The BPS 2000 filters collectively direct the system to initiate the following actions
on a packet, depending on your configuration:
• Pass or Drop
• Re-mark the packet when Pass is selected
— Re-mark a new DiffServ Codepoint (DSCP)
— Re-mark the 802.1p field
— Assign a drop precedence
Figure 102 provides a schematic overview of QoS policies.