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Using DLSw Prioritization
6-3
DLSw Priority Queues
This section describes how DLSw protocol prioritization works, and defines
DLSw terms.
Although similar to the existing circuit-level protocol prioritization, DLSw
prioritization is not limited to synchronous interfaces and does not operate at the
driver level. DLSw prioritization occurs before TCP sequences packets, where the
Data Link Control (LLC2 or SDLC) and TCP function.
The router sorts packets into priority queues as described in “The Enqueuing
Process.” The router then drains (dequeues) the priority queues to transmit packets
according to a weighted allocation algorithm described in “The Dequeuing
Process.”
Based on the needs of your site, you can configure up to 10 queues for each DLSw
peer. You can create queues for traffic with specific MAC or SAP address ranges
or, for SNA traffic, based on criteria in the SNA Transmission Header (FID2 and
FID4). You determine whether a queue applies to all DLSw peers or to one or
more specific configured peer.
Default and Peer-Specific DLSw Queues
To set the way the router handles priority queues for all DLSw traffic (including
unconfigured peers), you use the default DLSw queue configuration. To customize
the handling of queued traffic for a particular configured peer, you configure peer-
specific priority queues that apply to that peer’s IP address only.
The default priority queue configuration applies to all configured DLSw peers
except those individual peers for which you configure a custom priority queue.
When you create peer-specific queues, they take precedence over the default
queue.
The Enqueuing Process
The router enqueues packets that match a DLSw priority filter as follows:
1. Applies filter rules.
2. Stamps packets with a queue number.
3. Places packets in appropriate queues.
- Configuring DLSw Services 1
- Bay Networks Software License 3
- (continued) 4
- Contents 5
- About This Guide 17
- Before You Begin 18
- InfoFACTS 19
- World Wide Web 19
- How to Get Help 20
- Conventions 20
- Acronyms 21
- Chapter 1 23
- Data Link Switching Overview 23
- DLSw Networking Overview 24
- DLSw Single-Switch Services 27
- DLSw Dual Switch Services 28
- SDLC Support 30
- Integrated SDLC Conversion 31
- Frame Relay Support 33
- DLSw Filtering 35
- DLSw and Related Protocols 36
- Chapter 2 39
- DLSw Implementation Notes 39
- Counting SRB LANs and Bridges 40
- Counting the IP Virtual Ring 41
- Counting the Internal LAN 44
- Counting the DLSw Bridge 45
- Parallel Data Paths 47
- Source Routing Bridge 48
- Multiple DLSw Peers on a LAN 49
- DLSw and Bridging Services 49
- DLSw with Translation Bridge 51
- Memory Requirements 52
- TCP Considerations 53
- Flow Control 54
- LLC2 Flow Control 55
- TCP Flow Control 55
- Performance 56
- Chapter 3 57
- DLSw Configuration Overview 57
- DLSw SAP Table 61
- DLSw Slot Table 62
- DLSw Configuration Overview 63
- DLSw Peer IP Table 65
- Simplifying the Peer IP Table 66
- Configuration Objects for SDLC 68
- Local Devices 70
- Optional Configuration Objects 71
- Chapter 4 75
- Enabling DLSw Services 75
- 2. Click on OK 76
- Mapping Frame Relay Addresses 79
- Adding Slot IP Addresses 81
- Adding DLSw Peer IP Addresses 83
- 4. Click on Done 85
- Subsequent DLSw Configuration 99
- Chapter 5 101
- Editing DLSw Parameters 101
- Accessing DLSw Parameters 102
- (Figure 5-1) and then 103
- Select Protocols➔DLSw➔Global 103
- 3. Click on OK 104
- Enabling a DLSw Interface 113
- 1. Click on Add 118
- 3. Click on Done 121
- Click on Add 122
- 2. Click on Delete 125
- Adding a DLSw SAP Table Entry 127
- Click on Done 130
- 3. Click on Delete 131
- 2. Select the entry to edit 141
- Click on Apply 142
- Deleting DLSw from the Node 154
- Chapter 6 155
- Using DLSw Prioritization 155
- DLSw Priority Queues 157
- The Dequeuing Process 158
- The Dequeue List 159
- Weighted Dequeuing Algorithm 159
- Queue Depth 161
- Select ENABLED 164
- Click on OK 164
- 2. Click on Template 177
- Appendix A 187
- DLSw Default Settings 187
- Appendix B 191
- Predefined DLSw Criteria 192
- DLSw Reference Points 192
- Length (bits) 193
- Specifying MAC Address Ranges 194
- Table B-6. SAP Codes 196
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