HP 2610, Руководство по продвинутому управлению трафиком

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Quality of Service (QoS): Managing Bandwidth More Effectively
QoS Operating Notes and Restrictions
QoS Operating Notes and Restrictions
Table 6-12. Details of Packet Criteria and Restrictions for QoS Support
Packet Criteria or
Restriction QoS Classifiers DSCP
Overwrite
(Re-
Marking)
UDP/TCP Device
Priority (IP
Address) IP Type-of-
Service VLAN Source
Port Incoming
802.1p
Restricted to IPv4 Packets Only Yes Yes Yes No No No Yes
Allow Packets with IP Options
1
Yes Yes Yes Yes Yes Yes Yes
Support IPv6 Packets
2
No No No Yes Yes Yes No
Support Layer-2 SAP
Encapsulation No No No Yes 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.
■ 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. For more on VLANs, refer to chapter 2, “Static Virtual
LANs (VLANs)”.
■ SAP-Encapsulated Packet Restriction: Except for source-port
QoS and VLAN QoS, the switches covered in this guide do not support
QoS operation for SAP-Encapsulated packets. Thus, the switch can
use only VLAN QoS and source-port QoS to prioritize SAP-encapsu­
lated packets.
■ Packets with IP Option Fields in the Header: UDP/TCP QoS is
not supported for IP packets carrying optional fields in their headers.
■
RADIUS Authentication: RADIUS authentication allowing traffic
through a given port may override the port’s QoS configuration, which
generates an Event Log message. When the authenticated host discon­
nects, the port returns to the static QoS configuration.
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