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Configuring Bridging Services
5-4 117351-A Rev. A
Implementation Notes
The following sections describe some Native Mode LAN configuration features.
Defining a Closed User Group That Permits
Overlapping Network Traffic
In an NML environment, overlapping traffic occurs when members of one closed
group are allowed to exchange information with users on some, but not all, LANs
of another closed group.
To permit overlapping traffic on a LAN that is part of a closed user group, you
assign an access list to the LAN’s NML port that contains the CUGID for all
groups allowed to access the LAN. This requires the use of unique CUGIDs for
each involved port.
For example, members of the Star group need to exchange information with Moon
group members on LAN E (see F
igure 5-1 on page 5-2). To define LAN E as a
LAN that permits overlapping traffic, you assign NML port 7 an access list that
includes both Moon CUGIDs and Star CUGIDs.
Controlling NML Traffic on a Network Trunk
Network trunks carry the frames of all closed user groups. In Figure 5-1, for
example, the FDDI link between bridge 1 and bridge 2 is a network trunk. The
NML service allows you to control trunk traffic by blocking frames -- originating
on LANs you specify -- from accessing the trunk. If you determine, for example,
that frames originating from a LAN in a given closed user group can never reach
their destination via the trunk, you can block the frames from traveling on the
trunk. This feature helps reduce network traffic on the trunk by eliminating useless
frames.
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