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Configure LNM Support
BC-128
Bridging and IBM Networking Configuration Guide
Figure 52 LAN Network Manager Monitoring and Translating
Notice that the proprietary protocol LNM uses to communicate with the source-route bridge is an
LLC2 connection. Although its protocol cannot be routed, LNM can monitor or manage anything
within the SRB network.
How a Router Works with LNM
As of Software Release 9.0, Cisco routers using 4/16-Mbps Token Ring interfaces configured for
SRB support the proprietary protocol that LNM uses. These routers provide all functions the IBM
Bridge Program currently provides. Thus LNM can communicate with a router as if it were an IBM
source-route bridge, such as the IBM 8209, and can manage or monitor any Token Ring connected
to the router.
Through IBM Bridge support, LNM provides three basic services for the SRB network:
• The Configuration Report Server (CRS) monitors the current logical configuration of a Token
Ring and reports any changes to LNM. CRS also reports various other events, such as the change
of an active monitor on a Token Ring.
• The Ring Error Monitor (REM) monitors errors reported by any station on the ring. In addition,
REM monitors whether the ring is in a functional or a failure state.
• The Ring Parameter Server (RPS) reports to LNM when any new station joins a Token Ring and
ensures that all stations on a ring are using a consistent set of reporting parameters.
IBM Bridge support for LNM also allows asynchronous notification of some events that can occur
on a Token Ring. Examples of these events include notification of a new station joining the Token
Ring or of the ring entering failure mode, known as beaconing. Support is also provided for LNM
to change the operating parameters in the bridge. For a complete description of LNM, refer to the
IBM product manual supplied with the LNM program.
LNM support in our source-route bridges is a powerful tool for managing SRB networks. Through
the ability to communicate with LNM and to provide the functionality of the IBM Bridge Program,
our device appears as part of the IBM network. You therefore gain from the interconnectivity of our
products without having to learn a new management product or interface.
LAN Network Manager
Station A
Query about
Station A
Query to
Station A
1
2
Proprietary protocol
on LLC2
IEEE 802.5
S1114a
Token
Ring
Token
Ring