Avaya Configuring Traffic Filters and Protocol Prioritization Instrukcja Użytkownika Strona 37
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Using Circuit-level Protocol Prioritization
2-3
By default, protocol prioritization uses the bandwidth allocation algorithm to send
traffic to the transmit queue. This is because if the router uses the strict dequeuing
algorithm and there is a great deal of high-priority traffic on the network, the
normal- and low-priority traffic may never get transmitted.
You specify the active dequeuing algorithm as described in the section “Editing
Protocol Prioritization Parameters” later in this chapter.
Bandwidth Allocation Algorithm
The bandwidth allocation algorithm uses a configurable percentage of bandwidth
for each of the three priority queues to determine how to transmit queued traffic.
The default configuration is
• HighQ — 70% of bandwidth
• NormalQ — 20% of bandwidth
• LowQ — 10% of bandwidth
When the amount of traffic transmitted from a particular queue reaches the
configured percentage, the next priority queue begins to transmit traffic.
The amount of actual data transmitted depends on the clock speed of the circuit.
You can configure the clock speed on a synchronous interface by setting the
External Clock Speed parameter in the Configuration Manager Edit Sync
Parameters window. Refer to Configuring Line Services.
The bandwidth allocation algorithm works as follows:
1. The transmit queue scans the high-priority queue.
If there is no traffic in the high-priority queue, the algorithm proceeds to
Step 3.
2. The router empties all packets from the high-priority queue, up to the
configured bandwidth percentage, into the transmit queue and transmits
them.
The default bandwidth percentage for high-priority traffic is 70 percent. If the
actual bandwidth use is less than the limit, the router empties the high-priority
queue and proceeds to the normal-priority queue.
3. The transmit queue scans the normal-priority queue.
- Protocol Prioritization 1
- Bay Networks Software License 3
- Contents 5
- About This Guide 15
- Before You Begin 16
- CompuServe 17
- How to Get Help 18
- Conventions 18
- Acronyms 20
- Chapter 1 21
- Using Traffic Filters 21
- Inbound Traffic Filters 22
- Outbound Traffic Filters 23
- What Do Traffic Filters Do? 25
- Filtering Strategies 26
- Components of Traffic Filters 27
- Predefined Criteria 28
- Using Traffic Filters 29
- User-Defined Criteria 31
- Filtering Actions 32
- Prioritizing Actions 32
- Using Filter Templates 33
- Chapter 2 35
- The Dequeuing Process 36
- Strict Dequeuing Algorithm 40
- Monitoring Statistics 42
- Percent of Bandwidth 43
- Queue Depth 43
- Queue Depth Example 44
- Reconfiguring Queue Depth 44
- Latency = 46
- Bits Queued 46
- Line Speed (bits per second) 46
- 2. Click on Edit Circuit 47
- (Figure 2-10) 50
- Chapter 3 59
- Transparent Bridge Actions 62
- Length (bits) 63
- Source Routing Actions 64
- IP Criteria and Actions 65
- IP Actions 66
- IPX Criteria and Actions 67
- XNS Criteria and Actions 68
- OSI Criteria and Actions 69
- User-Defined OSI Criteria 70
- OSI Actions 70
- Predefined DECnet Criteria 70
- VINES Criteria and Actions 71
- User-Defined VINES Criteria 72
- VINES Actions 72
- DLSw Criteria and Actions 73
- LLC2 Criteria and Actions 74
- Chapter 4 75
- Predefined Data Link Criteria 76
- Predefined IP Criteria 78
- Data Link Reference Points 80
- IP Reference Points 82
- Chapter 5 83
- Specifying MAC Address Ranges 84
- Table 5-3. SAP Codes 86
- (continued) 90
- Table 5-9. IP Protocol Codes 92
- Chapter 6 93
- <protocol> 94
- Click on Create 98
- Figure 6-8. Add Range Window 101
- 7. Click on OK 101
- Customizing Templates 104
- Editing a Template 105
- Creating an Inbound Filter 107
- Click on OK 108
- Editing an Inbound Filter 109
- Changing Filter Precedence 114
- Deleting an Inbound Filter 118
- Chapter 7 119
- Preparing Filter Templates 122
- Creating a New Template 123
- 2. Click on OK 129
- Creating an Outbound Filter 134
- Editing an Outbound Filter 136
- <protocol header> 138
- <filter criterion> 138
- Deleting an Outbound Filter 142
- Appendix A 143
- Configuration Examples and 143
- Implementation Notes 143
- Dial Backup Traffic 144
- Using Drop-All Filters 144
- • Length 148
- Length to 149
- (continued) 151
- Configuring DLSw 152
- Services 152
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