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User Guide for Internetwork Performance Monitor
OL-11291-01
Chapter 3 Using IPM to Measure Network Performance
Measuring Network Performance for DLSw
Measuring Network Performance for DLSw
DLSw+ is the enhanced Cisco version of DSCP RFC 1795. DLSw+ tunnels SNA traffic over IP
backbones via TCP. The routers performing the tunneling of SNA traffic onto TCP/IP are referred to as
DLSw peers.
The DLSw operation measures the DLSw+ protocol stack and round-trip latency between DLSw peers.
Normally DLSw peers communicate through TCP port 2065.
A prerequisite to successfully running the DLSw operation is having a connected DLSw+ peer between
the source and destination Cisco devices. On the source DLSw+ device, an operation can be defined for
a DLSw+ partner peer. The DLSw operation also measures availability and errors for DLSw services.
Note To measure the round-trip latency between two DLSw peers, the IP address that you define as the source
router must be one of the DLSw peers, and the IP address that you define as the target router must be
configured as the DLSw peer to the source router.
To measure end-to-end performance for DLSw:
Step 1 Define a router as the source router from which to measure performance. For details on defining a source
device, see Defining a Source Device.
Step 2 Define a device as the target of DLSw requests from the source device. For details on defining a target,
see Defining a Target.
Step 3 To control how statistics are collected, use the DefaultDLSw operation or define your own DLSw
operation. For details on defining a DLSw operation, see Defining a DLSw Operation.
Step 4 Define a collector to measure performance between the source router and target you defined. For details
on defining a collector, see Defining a Collector. If you set the collector’s schedule to On Demand, start
the collector when desired.
Step 5 View the statistics in the DLSw Historical Statistics window. For details on viewing end-to-end statistics
for DLSw, see Viewing Statistics for DLSw.
Defining a DLSw Operation
IPM provides a default DLSw operation for measuring performance between a source and target. In
addition, IPM provides the option to create, modify, or delete your own DLSw operations from the
DLSw Operation Configuration window.
To define a DLSw operation:
Step 1 From the IPM Main Window, select Edit > Configuration.
The Configuration window appears.
Step 2 Click Operation.
The Operation Configuration window appears within the Configuration window.