ePMP: Configuring AP Quality of Service page

The ePMP platform supports three QoS priority levels (not available in ePTP Master mode) using air fairness, priority-based starvation avoidance scheduling algorithm.

Ordering of traffic amongst the priority levels is based on a percentage of total link throughput.  In other words, all priorities receive some throughput so that low priority traffic is not starved from transmission.  In effect, the greatest amount of throughput is guaranteed to the VOIP priority level, then High, then Low.

Priority Level

ePMP Traffic Priority Label

Highest Priority

VOIP (only utilized when VOIP Enable is set to Enabled)

Medium Priority

High

Lowest Priority

Low

By default, all traffic passed over the air interface is low priority. The AP’s Quality of Service page may be utilized to map traffic to certain priority levels using QoS classification rules. The rules included in the table are enforced starting with the first row of the table.

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Caution

Each additional traffic classification rule increases device CPU utilization. Careful network traffic planning is required to efficiently use the device processor.

The ePMP platform also supports radio data rate limiting (Maximum Information Rate, or MIR) based on the configuration of the MIR table. Operators may add up to 16 MIR profiles on the AP, each with unique limits for uplink and downlink data rates. The SM field MIR Profile Setting is used to configure the appropriate MIR profile for limiting the SM’s data rate.

Attribute

Meaning

Maximum Information Rate (MIR)

MIR

Disabled:  When disabled, RF transmission is only limited by the capacity of the link (and any active QoS classification rules).

Enabled:  When enabled, all downlink and uplink traffic is limited based on the profiles configured in the MIR table.

MIR Profiles

The MIR (Maximum Information Rate) table is comprised of up to sixteen profiles which, after configured, may be set on the SM to employ a certain service level or data rate.

Number

Assign a profile number to each row in the AP MIR table. This profile number is then set on each SM to limit data transfer rates based on the operator’s configuration of the MIR table and its profiles.

Description

Assign a logical description for each service level. For example, a tiered service-level provider may deploy service levels “Gold”, “Silver” and “Bronze” or “20 Mbps”, “10 Mbps” and “5 Mbps” to offer a clear description.

Downlink MIR (kbps)

Specify the downlink rate at which the AP is allowed to transmit for this configured profile.

Uplink MIR (kbps)

Specify the uplink rate at which the AP is allowed to transmit for this configured profile.

Traffic Priority

Traffic Priority

Disabled:  No traffic prioritization is performed. All traffic is treated with equal priority (low priority).

Enabled:  Traffic prioritization is enabled and specific types of traffic can be prioritized using the fields below.

VoIP Priority

Enabled:  When enabled, two entries are automatically added to the first and second rows of the QoS Classification Rules table, one with Rule Type CoS (5) and one with Rule Type DSCP (46). The addition of these rules ensures that VoIP traffic passed over the radio downlink is given highest priority. The CoS and DSCP values may be modified to accommodate non-standard VoIP equipment.

Disabled:  When disabled, VoIP traffic is scheduled normally along with all other user data.

Broadcast Priority

Low Priority:  All Broadcast traffic sent over the downlink is prioritized as low priority and is delivered to the SM after scheduled high priority and VoIP traffic.

High Priority:  All Broadcast traffic sent over the downlink is prioritized as high priority and is scheduled for delivery to SMs before low priority traffic but after VoIP traffic.

Multicast Priority

Low Priority:  All Multicast traffic sent over the downlink is prioritized as low priority, and will be delivered to the SM after scheduled high priority and VoIP traffic.

High Priority:  All Multicast traffic sent over the downlink is prioritized as high priority and is scheduled for delivery to SMs before low priority traffic but after VoIP traffic.

QoS Classification Rules

The QoS Classification Rules table contains all of the rules enforced by the device when passing traffic over the radio downlink. Traffic passed through the device is matched against each rule in the table; when a match is made the traffic is sent over the radio link using the priority defined in column Traffic Priority.

Type

CoS:  Class of Service; traffic prioritization is based on the 3-bit header present in the 802.1Q VLAN-tagged Ethernet frame header in the packet entering the AP’s Ethernet port.

VLAN ID:  traffic prioritization is based on the VLAN ID of the packet entering the AP’s Ethernet port.

EtherType:  traffic prioritization is based on the two-octet Ethertype field in the Ethernet frame entering the AP’s Ethernet port.  The Ethertype is used to identify the protocol of the data in the payload of the Ethernet frame.

IP:  traffic prioritization is based on the source and (or) destination IP address of the packet entering the AP’s Ethernet port. A subnet mask may be included to define a range of IP addresses to match.

MAC:  traffic prioritization is based on the source and (or) destination MAC address of the packet entering the AP’s Ethernet port. A mask may be included to define a range of MAC addresses to match. The mask is made up of a hex representation of a series of 1s to start the mask and 0s that end the mask. A 1 may not follow a 0. Thus FF:FF:FF:FF:00:00 is allowed, but FF:00:FF:FF:FF:FF is not. The MAC address is combined with the mask to define the range of allowed MAC addresses.

Details

Represents the details of the Class of Service (CoS) present in the packet entering the AP’s Ethernet port.

Priority

Represents the QOS classification rule priority.

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