HP 3500 Series Advanced Traffic Management Guide

5-2
Quality of Service: Managing Bandwidth More Effectively
Using Quality of Service Policies
■ Control the priority of traffic from dedicated VLANs or applications.
■ Change the priorities of traffic from various segments of your network as
your business needs change.
■ Set priority policies in edge switches in your network to enable traffic-
handling rules across the network.
Figure 5-1. Example of 802.1p Priority Based on CoS (Class-of-Service) Types and
Use of VLAN Tags
Figure 5-2. Example Application of Differentiated Services Codepoint (DSCP)
Policies
Apply QoS to inbound traffic at the network edge. At the edge switch,
QoS classifies certain traffic types and in some cases applies a DSCP policy.
At the next hop (downstream switch) QoS honors the policies established at
the edge switch. Further downstream, another switch may reclassify some
traffic by applying new policies, and yet other downstream switches can be
configured to honor the new policies.
Honor New PriorityEdge Switch
Classify inbound traffic
on these Class-of-
Service (CoS) types:
• IP-device (address)
• Protocol (LAN)
• VLAN-ID (VID).
• Source-Port
Apply 802.1p priority to
selected outbound
traffic on tagged VLANs.
Downstream
Switch
Tagged VLANs on some
or all inbound and
outbound ports.
Classify inbound traffic
on CoS types.
Change priority on
selected CoS type(s).
Forward with 802.1p
priority.
Downstream
Switch
Tagged VLANs on at
least some inbound
ports.
Traffic arrives with the
priority set in the VLAN
tag. Carry priority
downstream on tagged
VLANs.
Downstream
Switch
Tagged VLANs on
inbound and outbound
ports.
Traffic arrives with
priority set by edge
switch
Forward with 802.1p
priority.
Set Priority
Honor Priority
Change Priority
Edge Switch
Classify inbound traffic
on IP-device (address)
and VLAN-ID (VID).
Apply DSCP markers to
selected traffic.
Downstream
Switch
Classify on ToS DiffServ
and Other CoS
Apply new DSCP markers
to selected traffic.
Downstream
Switch
Classify on ToS Diffserv
Downstream
Switch
Traffic arrives with DSCP
markers set by edge
switch
Classify on ToS DiffServ.
Set Policy
Honor Policy
Change Policy
Honor New Policy

HP 3500 Series Specifications

General

Model	HP 3500 Series
Layer	Layer 3
MAC Address Table Size	16, 000 entries
Type	Managed
Uplink	SFP
PoE	Optional
Management	Web, CLI, SNMP
Routing Protocol	Static, RIP
Power Supply	Internal
Form Factor	1U rack-mountable
Jumbo Frame Support	Yes
Operating Temperature	32°F to 113°F (0°C to 45°C)
Ports	24 or 48 10/100/1000 ports