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5-41
Quality of Service (QoS): Managing Bandwidth More Effectively
QoS Operating Notes and Restrictions
QoS Operating Notes and Restrictions
QoS support based on packet type is shown below.
Table 5-11. Details of Packet Criteria and Restrictions for QoS Support
■ All Switches: For explicit QoS support of IP subnets, ProCurve recom-
mends forcing IP subnets onto separate VLANs and then configuring
VLAN-based classifiers for those VLANs.
■ For Devices that Do Not Support 802.1Q VLAN-Tagged Ports:
For communication between these devices and the switch, connect
the device to a switch port configured as Untagged for the VLAN in
which you want the device’s traffic to move.
■ Port Tagging Rules: For a port on the switch to be a member of a
VLAN, the port must be configured as either Tagged or Untagged for
that VLAN. A port can be an untagged member of only one VLAN of
a given protocol type. Otherwise, the switch cannot determine which
VLAN should receive untagged traffic. For more on VLANs, refer to
chapter 2, “Static Virtual LANs (VLANs)”.
■ Maximum QoS Configuration Entries: The switches covered in this
guide accept the maximum outbound priority and/or DSCP policy config-
uration entries. They support a maximum of 250 QoS entries. Each device
(IP address) QoS configuration uses two entries. Each TCP/UDP port QoS
configuration uses two entries. All other classifier configurations use one
entry each.
Packet Criteria or
Restriction
QoS Classifiers DSCP
Overwrite
(Re-
Marking)
Device
Priority (IP
Address)
IP Type-of-
Service
Source
Port
Incoming
802.1p
Restricted to IPv4 Packets Only Yes Yes No No Yes
Allow Packets with IP Options
1
YesYesYesYesYes
Support IPv6 Packets
2
No No Yes Yes No
Support Layer-2 SAP
Encapsulation
No No Yes Yes No
1
An “IP Option” is an optional, extra field in the header of an IP packet.
2
All Switches: For explicit QoS support of IPv6 packets, force IPv6 traffic into its own set of
VLANs and then configure VLAN-based classifiers for those VLANs.