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Configuring Bridging Services
5-2 114060 Rev. A
Each LAN in a closed user group is connected to a bridge through an NML port.
LAN A in the Star Closed User Group, for example, connects to Bridge 1 on NML
Port 1. LAN C connects to Bridge 2 through NML Port 6.
NML Port 1 and NML Port 6 are assigned the Star CUGID. They are also
provided with an access list that contains the Star CUGID.
An NML port adds its CUGID to each frame that enters the bridge from a closed
user group and uses its access list to validate the CUGID on each frame that
attempts to exit the bridge through the port. In this way, traffic on the LANs within
a closed user group is restricted to frames that bear the group’s CUGID.
Figure 5-1. NML Closed User Groups
BR 1 BR 2
LAN A LAN D
LAN B
LAN E
LAN C
NML1
NML3
NML6
NML7
East SideWest Side
(Star)
(Moon)
(Moon)
(Star)
(Moon)
2
4
NML5
NML port
FDDI Trunk
BRG0026A
Key
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