COMNET III

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<strong>COMNET</strong> <strong>III</strong> Reports and Statistics 2.15 Output Port Buffer Policy Report NODES: OUTPUT PORT BUFFER POLICY REPLICATION 1 FROM 0.0 TO 3600.0 SECONDS PREEMPTION THRESHOLD NODE: PACKETS PACKETS PACKETS PACKETS CONNECTED LINKS PREEMPTING PREEMPTED EXCEEDED REJECTED ________________________ __________ _________ _________ _________ Source/Destination 1: Link1 36 36 0 0 This report summarizes the output buffer policy actions on a port-by-port basis. The preemption and threshold values reported are specific for each output port on the node. The output buffer on a node first determines that there is room for a packet by checking that the specific output buffer has buffer space available to fit the incoming packet. It next checks that the total space used for all similar output buffers on the node does not exceed the buffer constraint in the node’s parameter set. The packet may be accepted in an output buffer if it fits in both the port-specific buffer and in the total buffer space available on the node. There are two other policies available at the output port to refine the initial test for admitting the packet into an output buffer. These policies are a "Preemption Policy" and a "Threshold Policy". These policies determine which packets may be accepted at an output buffer. The "Preemption Policy" checks to see if the packet will be accepted into the output buffer if the packet has passed the first check and does not initially fit in the output buffer. In this case, if the packet has sufficient priority, it can cause lower priority packets to be ejected from the buffer, and, thus, be blocked until there is enough space in the buffer for the incoming packet. The lower priority packets will be ejected only if there can be enough space made available for the incoming packet. The "Threshold Policy" checks to see if the packet will be accepted into the output buffer if the packet has passed the first test. This is so that if a packet fits in the buffer it can be rejected if the buffer size is above a threshold, and the packet lacks sufficient priority to use the congested buffer. This mechanism is commonly used for rejecting packets that are marked as "discard eligible" when the buffers are above their threshold in frame-switching networks such as ATM or frame-relay. Node Name The name of the node sending packets. Packets Preempting The number of packets that preempted other packets in the buffer, thus causing those other packets to be blocked. A higher priority packet arrives at the output buffer that is full and preempts a lower priority packet. 70
Chapter 2. Nodes Packets Preempted Packets Exceeded Packets Rejected The number of packets that were blocked due to preemption. A lower priority packet has been ejected from the output buffer by a higher priority packet. A large, high priority packet can eject many smaller, lower priority packets from the output buffer. Packets that have been accepted at the output buffer when the output buffer threshold has been exceeded. Packets that have been rejected at the output buffer when the output buffer threshold has been exceeded. 71
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COMNET III ________________________
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Contents Section I Statistics Monit
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Contents 8.14 DISCARD ELIGIBLE PACK
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Section I Statistics Monitors 1
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Statistics The fields of the dialog
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Statistics When plots of saved data
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Statistics confidence interval alph
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Statistics At the bottom of the mon
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Statistics 1.4 Processing Node Moni
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Statistics 1.6 HOL Blocking Switch
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Statistics Sessions In-Progress Mea
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Statistics 1.9 Dialup Point-to-Poin
Page 25 and 26: Statistics 1.11 FDM Link Monitors U
Page 27 and 28: Statistics 1.13 Link Group Link Mon
Page 29 and 30: Statistics 1.14 Modem Pool Monitors
Page 31 and 32: Statistics 1.16 Polling Link Monito
Page 33 and 34: Statistics 1.18 STK Link Monitors T
Page 35 and 36: Statistics Time To Connect Channels
Page 37 and 38: Statistics 1.19 TDM Link Monitors N
Page 39 and 40: Statistics 1.21 Token Passing Link
Page 41 and 42: Statistics 1.23 WAN Cloud Access Li
Page 43 and 44: Statistics 1.25 Message Sources Mon
Page 45 and 46: Statistics 1.27 Application Sources
Page 47 and 48: Statistics 1.29 Output Buffer Monit
Page 49 and 50: Section II Reports 43
Page 51 and 52: Reports COMNET III generates a numb
Page 53 and 54: Reports The reports are placed in a
Page 55 and 56: 2. Nodes Nodes represent processing
Page 57 and 58: Chapter 2. Nodes Busy Output Proces
Page 59 and 60: Chapter 2. Nodes 2.3 Received Messa
Page 61 and 62: Chapter 2. Nodes as the requested t
Page 63 and 64: Chapter 2. Nodes 2.6 Call Counts Re
Page 65 and 66: Chapter 2. Nodes 2.7 Call Level Rep
Page 67 and 68: Chapter 2. Nodes 2.9 Output Buffer
Page 69 and 70: Chapter 2. Nodes Packets Preempted
Page 71 and 72: Chapter 2. Nodes Packets Preempted
Page 73 and 74: Chapter 2. Nodes 2.13 Output Buffer
Page 75: Chapter 2. Nodes Packets Preempted
Page 79 and 80: 3. Links Links represent communicat
Page 81 and 82: Chapter 3. Links Link Utilization T
Page 83 and 84: Chapter 3. Links KBPS Delivered The
Page 85 and 86: Chapter 3. Links 3.4 Frame Size Rep
Page 87 and 88: Chapter 3. Links Number Of Retries
Page 89 and 90: Chapter 3. Links 3.7 Connection Sta
Page 91 and 92: Chapter 3. Links 3.9 Session Level
Page 93 and 94: Chapter 3. Links Calls Preempted Th
Page 95 and 96: 4. WAN Cloud A WAN Cloud represents
Page 97 and 98: Chapter 4. WAN Cloud 4.2 Frame Coun
Page 99 and 100: Chapter 4. WAN Cloud Buffer (Bytes)
Page 101 and 102: 5. Application Sources Application
Page 103 and 104: Chapter 5. Application Sources 5.2
Page 105 and 106: 6. Message and Response Sources Mes
Page 107 and 108: Chapter 6. Message and Response Sou
Page 117 and 118: 7. Call Sources Call Sources create
Page 119 and 120: 7.2 Disconnected Call Counts Report
Page 121 and 122: 8. Session Sources Session Sources
Page 123 and 124: Chapter 8. Session Sources 8.2 Mess
Page 125 and 126: Chapter 8. Session Sources 8.4 Setu
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Chapter 8. Session Sources 8.6 Setu
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Chapter 8. Session Sources 8.7 Wind
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Chapter 8. Session Sources 8.9 Time
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Chapter 8. Session Sources 8.11 Pac
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Chapter 8. Session Sources 8.13 Ass
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9. Transport and Answer Commands Tr
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Chapter 9. Transport and Answer Com
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10. Setup Commands Setup Commands,
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Chapter 10. Setup Commands 10.2 Mes
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Chapter 10. Setup Commands 10.4 Set
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Chapter 10. Setup Commands 10.6 Set
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Chapter 10. Setup Commands 10.8 Ret
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Chapter 10. Setup Commands 10.10 Ac
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Chapter 10. Setup Commands 10.12 Bu
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Chapter 10. Setup Commands 10.13 As
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11. Global Transport and Answer Com
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Chapter 11. Global Transport and An
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12. Global Setup Commands Global Se
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Chapter 12. Global Setup Commands 1
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13. Miscellaneous Reports 191
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Chapter 13. Miscellaneous Reports P
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Chapter 13. Miscellaneous Reports 1
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Chapter 13. Miscellaneous Reports t
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Index A Access Link Statistics ....
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Index Node Disk Capacity ..........
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Index Calls In Progress ...........
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Index Data Utilization From Net Acc
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COMNET III

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