Procedure 11-37: Provision Ethernet quality of service (QoS) - LNW78

Steps

Use the following to provision a QoS service.

1	Use the WaveStar® CIT to log in to the Alcatel-Lucent 1665 DMXtend shelf. Reference: Procedure 14-2: Connect Personal Computer (PC) and establish WaveStar® CIT session
2	Use the Configuration → Equipment command from the System View menu, select the circuit pack, then select the Ethernet LAN port being provisioned. Click on the QoS tab. Provision the QoS parameters as required. Or, use the ed-eport TL1 command to provision the parameters. Verify your settings, then click Apply. Read the warning message, then click Yes to execute the command. Click Close to exit. Repeat this step for each port in the network service. References: Procedure 11-8: Provision Ethernet LAN port parameters
3	Use the Configuration → Equipment command from the System View menu, select the circuit pack, then select the VCG port being provisioned. For RPR IF VCG ports (v1), click on the Queue Management tab. Provision the queue management parameters, as required. For RPR VCG ports (v1 or v2), click on the RPR Span tab. Provision the RPR shaper parameters, as required. Or, use the ed-vcg-rpr/ed-rpr TL1 commands to provision the parameters. For LNW78 Ethernet over SONET (EoS) ports (v17 - v22), click on the QoS tab. Provision the parameters, as required. Or, use the ed-vcg TL1 commands to provision the parameters. Queue Management parameters apply to VCG v1 only. RPR Span parameters apply to both VCG v1 and v2. Verify your settings, then click Apply. Read the warning message, then click Yes to execute the command. Click Close to exit. Repeat this step for each port in the network service. References: Procedure 11-9: Provision VCG parameters Procedure 11-33: Provision Resilient Packet Ring (RPR)-capable VCG parameters Procedure 11-34: Provision Resilient Packet Ring (RPR)-specific VCG parameters
4	Use the Configuration → Data → Provision QoS Service command from the System View menu, select the circuit pack, then select the port being provisioned. Or, use the ed-erate TL1 command to provision the parameters for the QoS service. Verify your settings, then click Apply. Read the warning message, then click Yes to execute the command. Click Close to exit. Reference: Procedure 11-24: Provision Ethernet QoS parameters End of steps

Ethernet QoS

Use as a reference to provision Ethernet Quality of Service (QoS).

The Alcatel-Lucent 1665 DMXtend uses the differentiated services (DiffServ) model for the QoS feature. Traffic flow to the network is regulated only at the ingress ports.

The DiffServ model has two types of ports:

• Boundary port - port at the edge of the DiffServ domain.

• Interior port - port internal to the DiffServ domain.

LNW78 LAN ports and Ethernet over SONET (EoS) VCG ports may be boundary only. LNW78 RPR VCG ports are Interior only.

In addition to port types, port roles are assigned to control how tags are assigned/removed/processed:

• Customer port — Initial and only allowed value for LNW78 LAN ports and Ethernet over SONET (EoS) VCG ports.

• Network port — Initial and only allowed value for LNW78 RPR VCG ports.

QoS Services/Traffic Management Modes

A basic QoS service is defined as a particular traffic flow that uses a single traffic conditioner. A number of services can be provisioned at a Boundary port. The configuration of these services is defined as one of two traffic management modes (trafmgmtmd). The mode specifies how the packets will be divided into traffic flows and the services that can be provided at the port. All services at one port must be in the same traffic management mode. The total number of QoS services on the LNW78 circuit pack is 400.

The traffic management modes are defined as follows:

• PORT mode - Allowed in all VLAN tagging modes. One QoS service per port.

• COSPORT mode - Allowed only in 802.1TAG mode. One QoS service and one TC for each Class of Service (CoS) at the port.

Selection of these port parameters may be done using the ed-eport and ed-vcg TL1 command, or Configuration → Equipment from the WaveStar^® CIT system menu, selecting the port, then clicking on the QoS tab. Select the Traffic Management Mode.

Classes of Service

Data packets classified at the ingress port result in unique traffic flows. Multiple flows can be mapped into a single Class of Service (COS). There may be up to three classes of service (CoS level 3, 2, and 1) corresponding to RPR classes A, B, and C, respectively. Class A has guaranteed bandwidth and lowest latency. Class B can have guaranteed bandwidth and bounded latency and can also have access to opportunistic bandwidth. Class C has no guarantees and only access to opportunistic bandwidth.

Selection of these parameters may be done using the ent/ed-erate TL1 commands, or Configuration → Data → Provision QoS Service from the WaveStar^® CIT system menu, then selecting the port.

Traffic Conditioning

Traffic conditioning is performed on the ingress packets at Boundary Ports by metering the packets and either marking or policing as appropriate. This is used to enforce the guarantees and limitations specified in a Service Level Agreement (SLA). Within the network, queueing and scheduling functions provide a network that is engineered to satisfy all of the attached customers’ SLA requirements.

Traffic Conditioner Parameters

Traffic Conditioner (TC) parameters include PIR, CIR, PBS, and CBS.

• PIR - Peak Information Rate. This is the peak information rate of the traffic conditioner function in Mbps. This is the PIR for the service addressed by the trafmgmtmd, port aid, tagid and cos. Value is from 0 to 1000. A value of 0 means that the PIR function is bypassed and there is no policing of the traffic. The value of PIR must be greater than or equal to CIR. PIR does not apply to CoS Level 3.

• CIR - Committed Information Rate. This is the committed information rate of the traffic conditioner function in Mbps for the service addressed by the trafmgmtmd, port aid, tagid, and cos. Value is from 0 to 1000. The value of cir must be less than or equal to pir. A value of 0 means that there is no network commitment on incoming traffic. All traffic will be considered excess traffic. CIR does not apply to CoS Level 1.

• PBS - Peak Burst Size. This is the peak burst size in kilobytes for the service addressed by the trafmgmtmd, port aid, tagid, and cos. Value is from 1 to 255. PBS does not apply to CoS Level 3.

• CBS - Committed Burst Size. This is the committed burst size in kilobytes for the service addressed by the trafmgmtmd, port aid, tagid, and cos. Value is from 1 to 255. The value of CBS must be less than or equal to PBS. In case of Private Line (vlantagmd set to NOTAG), the CBS value cannot be set (it inherits the PBS value). CBS does not apply to CoS Level 1.

Selection of these parameters may be done using the ent/ed-erate TL1 commands, or Configuration → Data → Provision QoS Service from the WaveStar^® CIT system menu, then selecting the port.

Metering, Policing, and Color Marking

Metering measures the data rate with conformance levels determined by three color markers:

• Red - data rates greater than the PIR or PBS.

• Yellow - data rates less than or equal to PIR or PBS, but greater than CIR or CBS.

• Green - data rates less than or equal to CIR or CBS.

Policing discards red packets at the boundary ports. The remaining yellow and green packets determine drop precedence (DP).

Packets ingressing at boundary ports are remarked. Packets user priority is altered to reflect COS and DP. In COSPORT mode, user priority bit values map to the specified COS value as specified in IEEE 802.17a-2004.

In PORT mode, the traffic class is set for all packets that ingress the port and the COS value is set based on the default priority of the port. The COS value is inserted into the packet prior to egressing the NE.

Selection of these parameters may be done using the ent/ed-erate TL1 commands, or Configuration → Data → Provision QoS Service from the WaveStar^® CIT system menu, then selecting the port.

Queue Management

Each port supports configurable thresholds expressed as a percentage of the total queue allocation. Each queue is controlled by setting the size of the queues, the queue weights and the drop thresholds for yellow and green packets. The performance of each CoS level is controlled by setting the dropping probabilities for each CoS level. Traffic that was admitted into the network within the terms of a Service Level Agreement (SLA) can be differentiated and given preferential treatment at the queue in order to satisfy the SLA service guarantees.

Selection of these port parameters may be done using the ed-eport, ed-vcg and ed-vcg-rpr TL1 commands, or Configuration → Equipment from the WaveStar^® CIT system menu, selecting the port, then clicking on the QoS tab. Select the Traffic Management Mode.

The following TL1 command (WaveStar^® CIT) parameters determine the maximum queue size and the minimum and maximum dropping thresholds for yellow and green packets:

• qsz - Maximum queue size. Total Queue Size (in Kbytes)

• qminthldg - Minimum dropping threshold for green packets. Green Packet Min Drop Threshold (in %)

• qmaxthldy - Maximum dropping threshold for yellow packets. Yellow Packet Max Drop Threshold (in %)

• qminthldy - Minimum dropping threshold for yellow packets. Yellow Packet Min Drop Threshold (in %)

The following TL1 command (WaveStar^® CIT) parameters determine the maximum drop probability for COS 1, 2, 3 packets:

• qdropwt1 - Specifies maximum drop probability for COS 1 packets. CoS 1 Packets Drop Probability Mark (in %)

• qdropwt2 - Specifies maximum drop probability for COS 2 packets. CoS 2 Packets Drop Probability Mark (in %)

• qdropwt3 - Specifies maximum drop probability for COS 3 packets. CoS 3 Packets Drop Probability Mark (in %)

RPR traffic shapers

RPR shapers govern the aggregate amount of class A and class B traffic ingressing on the RPR ring, and should typically be set to at least the sum of the CIR's for each class from all the LAN ports.

Provisioning of these port parameters may be done using the ed-rpr TL1 command, or Configuration → Equipment from the WaveStar^® CIT system menu, selecting the port, then selecting RPR Span.

The following TL1 command (WaveStar^® CIT) parameters determine the maximum rate that Class A or B traffic is allowed to be added to each ringlet:

• rsv_a - Specifies the maximum rate that Class A traffic can be added to each ringlet. It controls the Class A shaper. Reserved Class A Add Rate (Mb/sec):

• rsv_b - Specifies the maximum rate that Class B traffic can be added to each ringlet. It controls the Class B shaper. Reserved Class B Add Rate (Mb/sec):