- Preface
- Chapter 1: Introduction to Cisco CDA Visual Quality Experience
- Chapter 2: Getting Started with the VQE Startup Configuration Utility
- Chapter 3: Using the VQE Channel Provisioning Tool
- Chapter 4: Using the VQE-S Application Monitoring Tool
- Chapter 5: Using the VCDS Application Monitoring Tool
- Chapter 6: Troubleshooting VQE Software Components
- Chapter 7: Configuring VQE Server and VQE Tools
- Appendix A: VQE, System, and Network Parameters
- Appendix B: SNMP MIBs
- Appendix C: VQE System Messages
- Appendix D: Manual Initial System Configuration
- Appendix E: Configuring DHCP and DNS Servers for VCDS
- Appendix F: Using the vcds_send_file Utility
- Appendix G: Changing the Boot Sequence to Start from the CD/DVD
- Appendix H: VQE Server Performance and Scaling Limits
- Appendix I: VCPT Configuration Files
VQE Server Performance and Scaling Limits
This appendix summarizes performance information of the Cisco CDE110 and CDE111 platforms hosting the Cisco VQE Server (VQE-S), and provides information on how to access VQE-S capacity statistics. The information is for general deployment estimates only and may vary according to network designs.
Ingress and Egress Bandwidth Limits
Table H-1 presents ingress and egress bandwidth limits for all Cisco VQE releases of the CDE110 platform hosting the VQE-S.
Table H-2 presents ingress and egress bandwidth limits for all VQE releases of the CDE111 platform hosting the VQE-S.
As shown in Table H-2, in Cisco VQE Release 3.4 and later releases, the maximum ingress bandwidth on the CDE111 platform hosting the VQE-S is up to 2 Gbps, and the maximum egress bandwidth is up to 3 Gbps. The combination of ingress and egress bandwidth cannot exceed 4 Gbps. For example, if 1 Gbps of ingress bandwidth is used, up to 3 Gbps of egress bandwidth may be used. Similarly, if 2 Gbps of ingress bandwidth are used, up to 2 Gbps of egress bandwidth may be used.
Scaling and Performance Summary
Table H-3 presents scaling and performance summary for all releases of the CDE110 and the CDE111 platforms hosting the VQE-S.
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Maximum number of Unicast Retransmission Repair Requests (NACKs) input per second. |
10,000 bitmaps resulting in a maximum of 50,000 RTP1 packets |
Maximum Unicast Retransmission Rate—packets output per second. |
50,000 |
Maximum Number of Ingest Channels—This is subject to an additional constraint of platform ingest limits. |
500 channels or the maximum ingest bandwidth in Gbps, whichever limit is reached first. |
Maximum Number of Simultaneous Client Subscribers—Subscriber is defined as a consumer of video channel data. For a STB2 with multiple tuners (such as a watch one, record one capable STB), the VQE-S counts this as 2 subscribers. |
32,000 |
1 RTP = Real-time Transport Protocol. 2 STB = set-top box. |
The VQE-S separates the bandwidth resources that are dedicated to Unicast Retransmission and Rapid Channel Change (RCC). A VQE-S configuration parameter (vqe.vqes.reserved_er_bw) controls the bandwidth resources that are dedicated to Unicast Retransmission. The parameter allows the amount of resources dedicated to Unicast Retransmission to be reduced so that the resources are available for RCC instead. For information on this parameter, see Table A-2 of "VQE, System, and Network Parameters."
Note 
VQE licenses for Unicast Retransmission and RCC are sold separately per STB. Software licenses for Unicast Retransmission and RCC are sold separately from the hardware.
Note Each scaling limit is applied separately and all scaling limits must be met for proper service. Exceeding any of the scaling limits causes service to be denied.
VQE-S Capacity Statistics
The VQE-S Application Monitoring Tool (AMT) displays several counters and statistics under Capacity Statistics on the Statistics tab of the Error Repair and RCC Configuration window which together indicate whether the Unicast Retransmission, RCC, or client subscriber capacity limits, presented in the Scaling and Performance Summary section, have been exceeded. For information on the capacity statistics, see the "Viewing Error Repair and RCC Configuration" section.
Note The capacity statistics indicate when VQE services have been refused due to a capacity limit being reached. The capacity statistics provide no advanced warning of capacity limits being reached, nor do they provide an indication of when additional server capacity is required.
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