
Using Native Mode LAN Services
114060 Rev. A 5-3
In Figure 5-1, for example, consider what happens when a member of the Star
Closed User Group on LAN A sends a frame to another member of the Star group
located on LAN C.
1. The frame, properly addressed, enters Bridge 1 through NML Port 1.
2. Port 1 labels the frame with the Star CUGID.
3. Bridge 1 forwards the frame to Bridge 2 over the FDDI trunk.
4. The frame attempts to exit Bridge 2 through Port 6. Port 6 examines the
CUGID on the frame.
The CUGID on the frame matches the CUGID on the port’s access list. Port 6
forwards the frame to LAN C in the Star Closed User Group.
Defining a Closed User Group
To define a closed user group:
1. Select a CUGID for the closed user group.
2. Create an NML port for each LAN in the closed user group by adding the
NML protocol to an existing bridge circuit.
Refer to Chapter 2 of Configuring Routers for details.
3. Assign the group CUGID to each port and specify other NML port
parameters.
Refer to “NML
Add Security Range Parameters” later in this chapter for
details.
4. Provide each NML port with an access list containing the group CUGID.
Refer to “Assigning an
Access List to a Port” later in this chapter for details.
Implementation Notes
The following sections describe some Native Mode LAN configuration features.
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