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.
TablePacket Criteria or |
| QoS Classifiers |
| DSCP | |
Restriction |
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| Overwrite |
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| (Re- |
| Device | IP | Source | Incoming | |
| Marking) | ||||
| Priority (IP | Service | Port | 802.1p |
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| Address) |
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Restricted to IPv4 Packets Only | Yes | Yes | No | No | Yes |
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Allow Packets with IP Options1 | Yes | Yes | Yes | Yes | Yes |
Support IPv6 Packets2 | No | No | Yes | Yes | No |
Support | No | No | Yes | Yes | No |
Encapsulation |
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1An “IP Option” is an optional, extra field in the header of an IP packet.
2All Switches: For explicit QoS support of IPv6 packets, force IPv6 traffic into its own set of VLANs and then configure
■All Switches: For explicit QoS support of IP subnets, ProCurve recom- mends forcing IP subnets onto separate VLANs and then configuring
■For Devices that Do Not Support 802.1Q
■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.