
DLSw Implementation Notes
114063 Rev. A 2-15
DLSw Packaging
In DLSw dual-switch configurations, packaging allows multiple DLSw frames
(consisting of user data and the DLSw SSP header) to be placed into a single
TCP/IP frame. This provides two performance benefits:
• Reduces the number of TCP/IP encapsulation program executions. This
results in fewer router cycles when processing DLSw information.
• Reduces the amount of TCP/IP overhead per DLSw frame. Instead of 52 bytes
of overhead per information frame (32 for TCP, 20 for IP), a single TCP/IP
package carries multiple frames.
With DLSw packaging, a packet may be delayed for a short period while the
router waits to see whether there are any more packets routed to the same
destination peer. This delay may increase network latency. However, the
performance benefits increase the number of packets that can be delivered across
the network, increasing response time. DLSw packaging is important for networks
with many LAN/WAN segments and for networks with slow WAN links.
For information on configuring DLSw packaging parameters, refer to Chapter 5.
DLSw Prioritization
Bay Networks routers enable you to prioritize DLSw traffic by configuring
priority queues for DLSw peers. You apply DLSw prioritization by using
outbound filters. For information on DLSw prioritization, refer to Chapter 6.
Protocol Prioritization
You can use protocol prioritization to transmit DLSw traffic before other traffic on
an individual synchronous line interface. You can create a filter, as follows:
• Criteria = TCP source port
• Range = 2065 - 2067
• Action = high queue
This ensures that SNA and NetBIOS traffic receives preference on the network.
For more information on how to access and configure traffic filters for DLSw
services, refer to Configuring Traffic Filters and Protocol Prioritization.
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