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DLSw Implementation Notes
2-15
For more information on DLSw memory usage, contact Bay Networks Technical
Response Center.
TCP Considerations
TCP timers allow you to configure DLSw to periodically give TCP data to
transmit if a connection is inactive for a period of time. The mechanism by which
TCP determines a lost connection (either a failed link with no rerouting possible,
or the remote router is unavailable) is based on TCP attempts to deliver this data.
If TCP does not receive an acknowledgment after a series of retries, it declares the
connection down and informs DLSw. DLSw then manages the currently active
sessions.
There are two main configuration parameters associated with DLSw timers:
• DLSw Keepalive Time
• TCP Max Retransmission Timeout
Configuring TCP Services describes the Max Retransmission Timeout parameter.
This section describes the Keepalive Time and the Max Retransmission Timeout
parameters.
DLSw Keepalive Time
The DLSw Keepalive Time parameter ensures that the TCP connection to a
remote router is active. You enable the parameter by specifying a nonzero value.
The Keepalive Time setting determines when to send data into the TCP pipe.
Since only one packet is sufficient to initiate the TCP retransmission procedure,
short intervals (less than 30 seconds) will use additional memory and resources
unnecessarily. Low values (such as 1 second) do not significantly decrease
notification time, but significantly increase CPU and WAN bandwidth utilization
because each “keepalive” sends data into the TCP connection, awaiting
acknowledgment by the remote router.
In busy networks, the DLSw keepalive is not necessary. Frequent traffic for TCP
transmission performs the same function as a keepalive setting. For example,
frequent NetBIOS broadcast traffic functions as a TCP keepalive.
The Keepalive Time parameter appears on the Edit DLSw Global Parameter
window.
- 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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