switched and can process approximately the same amount of traffic as TCP. DLSw Lite
transports SNA and NetBIOS traffic across a point-to-point connection where local
acknowledgment and reliable transport are important but where nondisruptive rerouting
around link failures is not required.
LLC2 connection must periodically check that the LLC2 connection is still active. The great
thing about DLSw is that, unlike RSRB, you can terminate LLC2 connections locally. The
DLSw standards eliminate the requirements for LLC2 acknowledgments and keep messages
flowing across the WAN alive. Because routers acknowledge frames locally, LLC2 timeouts
should never occur.
13-14. It provides peer-to-peer SNA routing. Instead of defining all the network resources on
the mainframe, you can define local resources on the nodes (routers), and they pass this
information around in the form of a distributed database. This is similar to what Cisco routers
do by defining the networks connected to the interfaces. The routers pass around the
information from those networks as in OSPF. In the same manner, the routers pass the SNA
network information to each other. Sessions can be established between any two logical units
in the network without involving a mainframe.