Quality of Service Guide 757
High Scale Ethernet MDA Capabilities
In This Section
This section provides information to configure HSMDA QoS policies using the command
line interface.
Topics in this section include:
• HSMDA QoS Model
• SAP Ingress and SAP Egress QoS Policies
• Subscriber Queuing Differences
• Basic HSMDA Configurations
• Applying HSMDA Policies
• HSMDA Features
HSMDA QoS Model
This section describes QoS capabilities of the High Scale Ethernet MDA (HSMDA). The
HSMDA extends subscriber and service density of the first and second generation IOMs by
adding an XMA or MDA level of ingress and egress queues, shapers and schedulers.
The HSMDA replaces the ingress and egress service queuing function performed by the
ingress and egress forwarding plane on the IOM, providing up to 160K service or subscriber-
based queues in each direction. The queues are configured in groups of eight. The addition of
the ingress packet classification and queues allows QoS classification and service-level
queuing to be performed on the XMA or MDA instead of the directly-attached IOM
forwarding plane. The egress side of the HSMDA relies on the existing egress forwarding
plane to map egress packets to the HSMDA egress queues.
The HSMDA moves service and subscriber-level ingress and egress QoS functions off the
IOM forwarding plane to the XMA or MDA. The HSMDA QoS model provides the
following features:
• Expanded queue scale for ingress and egress
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