Dedicated Queue Scaling for CoS Configurations on Trio MPC/MIC Interfaces Overview
The 30-Gigabit Ethernet Queuing and 60-Gigabit Ethernet Queuing and Enhanced Queuing Ethernet Modular Port Concentrator (MPC) modules provide a set of dedicated queues for subscriber interfaces configured with hierarchical scheduling or per-unit scheduling.
The dedicated queues offered on these modules enable service providers to reduce costs through different scaling configurations. For example, the 60-Gigabit Ethernet Enhanced Queuing MPC module enables service providers to reduce the cost per subscriber by allowing many subscriber interfaces to be created with four or eight queues. Alternatively, the 30-Gigabit Ethernet and 60-Gigabit Ethernet Queuing MPC modules enable service providers to reduce hardware costs, but allow fewer subscriber interfaces to be created with four or eight queues.
This topic describes the overall queue, scheduler node, and logical interface scaling for subscriber interfaces created on these Trio MPC/MIC module combinations.
Queue Scaling for Trio MPC/MIC Interfaces
Table 1 lists the number of dedicated queues and number of subscribers supported per Trio MPC module.
Table 1: Dedicated Queues for Trio MPC/MIC Interfaces
MPC | Dedicated Egress Queues | Supported Subscriber Interfaces | Logical Interfaces with 4 Queues | Logical Interfaces with 8 Queues |
|---|---|---|---|---|
30-Gigabit Ethernet Queuing MPC | 64,000 | 16,000 | 16,000 (8000 per PIC) | 8000 (4000 per PIC) |
60-Gigabit Ethernet Queuing MPC | 128,000 | 32,000 | 32,000 (8000 per PIC) | 16,000 (4000 per PIC) |
60-Gigabit Ethernet Enhanced Queuing MPC | 512,000 | 64,000 | 64,000 (16,000 per PIC) | 64,000 (16,000 per PIC) |
Each interface-set uses 8 queues from total available egress queues.
Management of Dedicated and Remaining Queues
An SNMP trap is generated to notify you when the number of available dedicated queues on the module drops below 10 percent.
When the maximum number of dedicated queues on the Trio MPC modules is reached, a system log message, COSD_OUT_OF_DEDICATED_QUEUES, is generated. The system does not provide subsequent subscriber interfaces with a dedicated set of queues. For per-unit scheduling configurations, there are no configurable queues remaining on the module.
For hierarchical scheduling configurations, remaining queues are available when the number of dedicated queues is reached on the module. Traffic from these logical interfaces are considered unclassified and attached to a common set of queues that are shared by all subsequent logical interfaces. These common queues are the default port queues that are created for every port. You can configure a traffic control profile and attach that to the interface to provide CoS parameters for the remaining queues.
For example, when the 30-Gigabit Ethernet Queuing MPC is configured with 32,000 subscriber interfaces with four queues per subscriber, the module can support 16,000 subscribers with a dedicated set of queues. You can provide CoS shaping and scheduling parameters to the remaining queues for those subscriber interfaces by attaching a special traffic-control profile to the interface.
These subscriber interfaces remain with this traffic control profile, even if dedicated queues become available.
Related Topics
- For information about managing dedicated queues in a static CoS configuration, see Managing Dedicated and Remaining Queues for Static CoS Configurations on Trio MPC/MIC Interfaces
- For information about managing dedicated queues in a dynamic subscriber access configuration, see Managing Dedicated and Remaining Queues for Dynamic CoS Configurations on Trio MPC/MIC Interfaces
- Scheduler Node Scaling on the Trio MPC/MIC Overview
- COSD System Log Messages
