Troubleshooting guide

11-7
Cisco Broadband Local Integrated Services Solution Troubleshooting Guide
OL-5169-01
Chapter 11 Element Management and MIBs
Cisco uBR7246vxr MIBs
Scheduler QoS Control Group
To ensure Quality of Service and fairness, the scheduler needs to control the traffic. This group includes
attributes that user can configure how the scheduler controls the traffic and attributes showing the current
status of the scheduler admission and rate control.
For each Service ID, there is one Quality of Service profile associated with it. The QoS profile limits the
request (upstream)/packet (downstream) size for the Service ID and also defines the minimum
guaranteed upstream bandwidth. Each modem's request associated with a Service ID needs to follow the
Quality of Service profile constraints.
• Quality of Service control upstream table (cdxQosCtrlUp)
Because upstream's bandwidth(BW) is limited, the upstream scheduler needs to control the
registration according to the upstream's bandwidth (BW) capacity for new MTA asking to be
supported in this upstream. This table contains the configurable objects that can enable or disable
the controlling process of the scheduler and the state objects that shows the current status of the
scheduler.
• Rate Limiting table (cdxQosIfRateLimit)
After a MTA is registered, upstream and downstream schedulers will control the bandwidth
request/packet size to ensure the Quality of Service and fairness by a rate limiting algorithm. This
table contains attributes related to the rate limiting algorithms.
• Cmts Service Extension Table (cdxIfCmtsService)
This table extends the information about a Service ID in docsIfCmtsServiceTable.
For each Service ID, there is one Quality of Service profile associated with it and the profile limits
the request/packet size for the Service ID. This table shows downstream traffic statistics and the
various counts that the Service ID exceeds the limit in its Quality of Service profile.
Scheduler QoS Queue Group
To ensure Quality of Service and fairness, the scheduler maintains a set of queues for different services
and puts MTA requests/packets for that Sid in different queue according to the Quality of Service profile
of the Sid. Each queue has a name and order within the queue set. The scheduler will serve the
requests/packets in higher order queue before serving the requests/packets in lower order queue.
• Scheduler bandwidth request queues table (cdxBWQueue)
This table displays the attributes for these queues in a cable interface scheduler that supports Quality
of Service.
CMTS MTAs Customer Premises Equipment (CPE) Group
This group contains tables in CMTS for information about MTAs (cable modems) and Customer
Premises Equipment (CPE) that connects to the MTA.
• Cable modem (CM) or Customer Premises Equipments (CPE) Table (cdxCmCpe)
This table contains information about MTAs.
• CMTS CM status extension table (cdxCmtsCmStatus)
This table extends the MTA status information in docsIfCmtsCmStatusTable.
• CMTS MAC extension Table (cdxCmtsCm)