Cabletron Systems CSX1000 - Manual (Page 221)

Workgroup Remote Access Switch 221
C ONFIGURING A DVANCED B RIDGING
Bridge Mode of Operation
B RIDGE M ODE OF O PERATION B ACKGROUND I NFORMATION
Selecting the bridge mode of operation allows you to determine the forwarding method that the
bridge will use to distribute LAN packets to the remote sites and to the LAN ports of the system.
The two possible modes of operation are the Unrestricted Bridge Mode and the Restricted Bridge
Mode.
Note: If the mode of operation is changed, any previously defined filters will be deleted. Any
previously defined protocol definitions will remain unchanged.
The following two sections provide further details for each bridge mode of operation.
U NRESTRICTED B RIDGE M ODE
In general, Unrestricted Mode forwards all packets, unless specified otherwise through a bridge
filter. If the Unrestricted Bridge Mode is selected, the following packet forward possibilities exist:
•
If the packet matches a discard filter, it is discarded.
• If the packet matches a connect filter, it is connected and forwarded to the members of the dis-
tribution list.
• If the packet matches no filter, the packet is forwarded. The specific forwarding action depends
upon whether or not the destination is known. (See following descriptions.)
No Filter Match - Destination Known
If the destination is known and the corresponding device is on the Known Connect List, the
connection is made and the packet is then forwarded to the specific destination.
If the device is not on the Known Connect list, the packet is sent to all current connections.
No Filter Match - Destination Unknown
The packet is sent to all current connections.
R ESTRICTED B RIDGE M ODE
If the Restricted Bridge Mode is selected, packets will be discarded unless overridden by a user-
defined bridge filter. The bridge filters, therefore, allow you to transfer only the packets that you
specify.
If the Restricted Bridge Mode is selected, the following packet forwarding possibilities exist:
•
If the packet matches a discard filter (packet filter only), it is discarded.
• If the packet matches a forward filter, it is forwarded to the distribution list.
• If the packet matches a connect filter, it is connected to the members of the distribution list.
However, with Restricted Mode, the packet needs to match a forwarding filter in order to be
forwarded.
• If the packet matches no filter, the specific action for the packet depends upon whether or not
the destination is known. (See following descriptions.)
No Filter Match - Destination Known
If the destination is known and the corresponding device is on the Known Connect list, the con-
nection is made. If the device is not on the Known Connect list, the packet is discarded.
No Filter Match - Destination Unknown
The packet is discarded.