Bridging - Bay Networks NauticaRS Reference Manual

NauticaRS 5.5R Reference Guide

Bridging

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If a non-routed protocol is to be forwarded to another network,
Nautica series routers can also function as bridges at the same
time. Unlike a router, a bridge operating at the data link layer
forwards all frames (regardless of their network address or
protocol) to the remote unit, if the destination address is known to
be reachable there.
You must enable bridging globally in the system# object before it
can be enabled on a Nautica path, as this setting has priority. If
bridging is required on a specific path, it must also be enabled in
the path# context.
Note: Bridging only really applies to leased circuit connected
paths, as an ISDN call cannot be set up for a non-routed protocol.
If this type of operation is required, Nautica series ISDN Bridge
products offer this facility.
After bridging has been enabled, you may find that unwanted
protocols are being forwarded to the remote network. These can
be removed using Filtering. Filtering is a method of detecting the
Ethernet frame type and the protocol carried within it, and then
forwarding or rejecting it.
Once a bridge filter has been set up in the bridge# context, the
action-on-match attribute within the filter needs to be set to either
Reject or Forward.
If the Forward option is chosen, then only those frames in the
Filter table are forwarded, all others are rejected. If the Reject
option is selected, those frames in the table are rejected and all
other options are forwarded. This process applies to the LAN01
path and all paths that have bridging enabled. Frame forwarding
or rejection takes place at the transmitting end of the path.
For more information on bridging, refer to Chapter 12.
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