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About the CyberSWITCH 100 Router
Operation of the CyberSWITCH 100 is influenced by routing and bridging controls and filters set
during router configuration as well as automatic spoofing and filtering performed by the
CyberSWITCH 100. General IP routing, and routing or bridging from specific remote routers are
controls set during the configuration process. Spoofing and filtering, which minimize the number
of packets across the WAN, are performed automatically by the CyberSWITCH 100. For example,
RIP routing packets and certain NetBEUI packets are spoofed even if only bridging is enabled.
IEEE 802.1d Bridging —
The CyberSWITCH 100 supports the IEEE 802.1d standard for LAN
to LAN bridging. Bridging is provided over PPP as well as adjacent LAN ports. The bridging
software uses transparent bridging. Configured as a bridge, the unit bridges data packets to the
destination, regardless of the network protocols used.
Also included is the Spanning Tree Protocol allowing the CyberSWITCH 100 to provide bridging
redundancy while preventing data loops and duplicate data. This is a learning bridge; i.e., the
bridge builds and updates an address table with each MAC source address and associated
information when the packets are received.
IP and IPX Routing
IP rrouting support provides the ability to process TCP/IP frames at the network
IP Routing —
layer for routing. IP routing support includes the Routing Information Protocol (RIP) that allows
the exchange of routing information on a TCP/IP network. The router receives and broadcasts RIP
messages to adjacent routers and workstations. Since IP sends out periodic RIP frames that could
keep dial-up links permanently connected, filtering and spoofing are performed to minimize these
broadcasts on the WAN links. The router filters service packets on one end and emulates them at
the other end with spoofing. The router uses the "piggyback method" to send RIP update packets
to the WAN port. The piggyback method means that RIP update packets are sent only when the
dial-up link is established because of data traffic.
Network Information Diagrams
It is helpful to draw a diagram (see Figure 2 on the following page) including all locations,
addresses, router names, etc. This section includes sample diagrams needed to configure the
CyberSWITCH 100. You may need different addressing information depending on whether you
are configuring IP routing and/or NetWare IPX routing.
If the CyberSWITCH 100 is to direct IP traffic over the ISDN
TCP/IP Route Addresses —
connection, the routing table in the CyberSWITCH 100 must be "seeded" with static IP routes so
that it dials out to the appropriate remote router when IP traffic is targeted to networks and stations
14 CyberSWITCH 100 Advanced User Information
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