DLSw


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DLSw

(Data Link SWitching) An IBM method for integrating and forwarding SNA and LAN traffic over wide area networks (WANs) by encapsulating the data in TCP/IP packets. DLSw supports the SDLC (SNA) and LLC2 (Token Ring) data link protocols and is generally employed in routers. Multiprotocol over frame relay (MPOFR) is a later technology designed to move SNA and LAN traffic over frame relay. See MPOFR.
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Bay Networks also has extended its DLSw functionality to support PU Type 1 (PU1) devices which are SDLC-attached controllers such as IBM 5294 and 5394 devices.
Further enhancing network availability, Bay Networks routers also enable users to define a backup DLSw peer to be used when the destination router and/or interface is unavailable.
In addition, the company is providing scalability on all versions of DLSw by enabling fully independent DLSw operation on every slot.
25 networks, Bay Networks has enhanced its DLSw support for Qualified Link Level Control (QLLC).
Access for Windows' Desktop DLSw supports both versions of the industry-standard DLSw specification, RFC 1795 and RFC 1434, making it highly interoperable.
With Desktop DLSw, Access for Windows is the only PC-to-host connectivity solution to include SNA over TCP/IP connectivity as a standard option," says Maks Wulkan, Eicon Technology's executive vice-president.
The Desktop DLSw connectivity option in Access for Windows allows for simultaneous host sessions through different vendors' routers to multiple destinations such as IBM mainframes, AS/400 systems, or even APPC engines.
While minimizing overhead, it still offers several key DLSw benefits such as broadcast reduction, dynamic searching and local acknowledgment.