Data Link Switching Overview
1-7
DLSw dual switch services is based on RFC 1434. This RFC defines the TCP/IP
control protocol, Switch-to-Switch Protocol (SSP) used between DLSw devices.
Packets from a Token Ring, Ethernet, Frame Relay, or SDLC network are carried
to an attached Bay Networks DLSw node where the data is translated into SSP
datagrams. The data is then routed over the multiprotocol backbone to a remote
Bay Networks DLSw node using an IP routing protocol. When the SSP datagram
reaches the remote Bay Networks DLSw node, it is translated into the appropriate
frame and carried to its destination.
Figure 1-4 shows how SNA devices use DLSw dual switch services to
communicate over TCP/IP. This differs from adjacent single switch operation,
which uses LLC2 on the backbone.
Figure 1-4. DLSw Dual Switch Services for SNA Devices on LANs
IP LLC 2
LLC 2 or SDLC
Bay Networks Router
Token Ring
Bay Networks Router
SDLC
Cluster Controller
LLC2
LLC2 LLC2
Token Ring
Ethernet
IP
Network
NetBIOS
Server
Logical Connection
SNA
Processor
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