
9032563 E1 DLSw Application
8-1
Chapter 8
DLSw Application
Data Link Switching (DLSw) is an IBM extension to source route bridging that allows otherwise
unroutable Systems Network Architecture (SNA) and NetBIOS frames to be routed.
DLSw, running on an IBM 6611 network processor, is the transport of data at the LPDU layer
across a transparent transport network. There are two types of data link switching: Local and
Remote.
In local data link switching, the data link switching function is performed within a single 6611. It
is used for SNA transport only. Local data link switching supports communication between a
LAN-attached SNA device and a synchronous data link control (SDLC) secondary station that is
link-attached to the 6611. The secondary station is assigned a MAC sublayer address so that it
appears to other network devices to be on a LAN.
In remote data link switching, stations attached to two or more 6611s communicate across an IP
network (WAN) using data link switching. Remote data link switching is used for both SNA and
NetBIOS transport. An SNA or NetBIOS station attached to a 6611 uses remote data link
switching to communicate with an SNA or NetBIOS station attached to another 6611. SNA
stations may be link-attached or LAN-attached to the 6611, that is, both SDLC-to-LAN and
LAN-to-LAN communication is supported across a WAN. NetBIOS stations must be
LAN-attached.
DLSw Views
The DLSw Application appears as a major icon in the Application View of the
device it is running on. The DLSw Application supports only one application-
specific option from the Icon Subviews menu, Configuration, which displays
the Information View. The Information View contains three fields and several
buttons leading to more detailed views.
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