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Using Protocol Prioritization Queues
117348-A Rev. A 2-13
Figure 2-5. Reconfigured Priority Queue Statistics for the Queue Size
Examples
To see whether this reallocation solves the problem, reset the Clipped Packets
Count and High-Water Packets Mark counters using the Statistics Manager and
check them again later.
Latency
Line delay, or latency, indicates how many bits of normal- or low-priority traffic
the router can allocate to the transmit queue at any one time. The latency value is
the greatest time delay that a high-priority packet can experience.
Latency is based on the line speed of the attached media. The following formula
illustrates how the line speed, bits queued, and latency value are related:
Latency = Bits Queued / Line Speed (b/s)
The default value for latency is 250 milliseconds (ms). This value generally
ensures good throughput and maintains rapid terminal response (rapid echoing of
keystrokes and timely response to commands) over most media.
You can change the default latency value by setting the Max High Queue La
tency
parameter. Keep in mind, however, that if you specify a higher latency value (thus
allowing more room on the transmit queue), throughput increases, but terminal
response time decreases. Bay Networks recommends using the default value of
250 ms.
0
10
20
High
Normal
Low
Queue Size = 30
Clipped Packets Count = 0
High-Water Packets Mark = 20
Queue Size = 20
Clipped Packets Count = 0
High-Water Packets Mark = 10
Queue Size = 10
Clipped Packets Count = 0
High-Water Packets Mark = 06
0
10
20
0
10
30
TF0005A
- Configuring Traffic Filters 1
- Bay Networks Software License 3
- Contents 5
- 117348-A Rev. A 11
- About This Guide 15
- Conventions 16
- Acronyms 17
- Bay Networks Customer Service 19
- How to Get Help 20
- Chapter 1 21
- Using Traffic Filters 21
- Inbound Traffic Filters 22
- Outbound Traffic Filters 23
- Filtering Strategies 24
- Combine Filters 25
- Build a Firewall 25
- Traffic Filter Components 26
- Using Traffic Filters 27
- Predefined Criteria 28
- 1-10 117348-A Rev. A 30
- 1-12 117348-A Rev. A 32
- Using Filter Templates 33
- 1-14 117348-A Rev. A 34
- Chapter 2 35
- Priority Queuing 36
- The Dequeuing Process 37
- 117348-A Rev. A 2-5 39
- 2-6 117348-A Rev. A 40
- 117348-A Rev. A 2-7 41
- 2-8 117348-A Rev. A 42
- Tuning Concepts 44
- 117348-A Rev. A 2-11 45
- Queue Size Example 46
- Reconfiguring Queue Size 46
- Examples 47
- 2-14 117348-A Rev. A 48
- 117348-A Rev. A 2-15 49
- Chapter 3 51
- Transparent Bridge Actions 54
- Predefined SRB Criteria 55
- User-Defined SRB Criteria 56
- SRB Actions 56
- Predefined DECnet Criteria 57
- User-Defined DECnet Criteria 57
- DECnet Actions 57
- DLSw Criteria and Actions 58
- IP Criteria and Actions 59
- IP Actions 60
- IPX Criteria and Actions 61
- LLC2 Criteria and Actions 62
- OSI Criteria and Actions 63
- VINES Criteria and Actions 64
- XNS Criteria and Actions 65
- Chapter 4 67
- Selecting Predefined Criteria 68
- Predefined IP Criteria 70
- 117348-A Rev. A 4-5 71
- Data Link Reference Points 72
- IP Reference Points 74
- Selecting Actions 75
- Prioritizing Actions 76
- Dial Service Actions 76
- 117348-A Rev. A 4-11 77
- Chapter 5 79
- Specifying MAC Address Ranges 80
- SRB Functional MAC Addresses 81
- 5-4 117348-A Rev. A 82
- Table 5-3. SAP Codes 82
- Table 5-4. Frame Relay NLPIDs 83
- Table 5-5. PPP Protocol IDs 83
- 5-6 117348-A Rev. A 84
- 5-8 117348-A Rev. A 86
- 88
- 88
- Chapter 6 89
- 6-2 117348-A Rev. A 90
- 117348-A Rev. A 6-3 91
- 117348-A Rev. A 6-5 93
- 6-8 117348-A Rev. A 96
- 6-10 117348-A Rev. A 98
- 117348-A Rev. A 6-11 99
- 6-12 117348-A Rev. A 100
- 117348-A Rev. A 6-13 101
- 6-14 117348-A Rev. A 102
- 6-16 117348-A Rev. A 104
- 6-18 117348-A Rev. A 106
- 6-20 117348-A Rev. A 108
- Chapter 7 109
- 7-2 117348-A Rev. A 110
- 117348-A Rev. A 7-3 111
- Creating a Template 112
- 113
- 7-6 117348-A Rev. A 114
- 7-8 117348-A Rev. A 116
- Customizing Templates 117
- 7-10 117348-A Rev. A 118
- 117348-A Rev. A 7-11 119
- 7-12 117348-A Rev. A 120
- Drop_Telnet_S42 121
- SRB_DSAP_hiQ 121
- 7-14 117348-A Rev. A 122
- 7-16 117348-A Rev. A 124
- 7-18 117348-A Rev. A 126
- 7-20 117348-A Rev. A 128
- 117348-A Rev. A 7-21 129
- 7-22 117348-A Rev. A 130
- 117348-A Rev. A 7-23 131
- Appendix A 133
- 134
- 117348-A Rev. A A-3 135
- A-4 117348-A Rev. A 136
- 117348-A Rev. A A-5 137
- A-6 117348-A Rev. A 138
- 139
- 140
- Appendix B 141
- 142
- (continued) 143
- B-4 117348-A Rev. A 144
- filtering goals 145
- B-8 117348-A Rev. A 148
- Configuring DLSw 149
- Services 149
- (continued) 149
- B-10 117348-A Rev. A 150
- Implementation Notes 151
- B-12 117348-A Rev. A 152
- 117348-A Rev. A B-13 153
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