Lucent Optical Management System (oms) Release

Intermediate systems (IS)

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365312875R5.2 V1 LUCENT OPTICAL MANAGEMENT

Intermediate systems (IS)
Intermediate systems (IS) are used for routing data between nodes and (sub) networks.
The end system to intermediate system (ES-IS) protocol is responsible for the exchange
of data between an end system and intermediate system. A network element can act
both as an end system as well as an intermediate system. However, a Lucent OMS, for
example, can only act as end system.
IS-IS protocol
The intermediate system to intermediate system (IS-IS) protocol is used between
intermediate systems in the DCN. The IS-IS protocol maintains the IS routing
information base (RIB). The information in this information base is used for the
routing of management data packets in the DCN by the intermediate systems.
Routing information base and LSPs
Each RIB comprises a number of tables. These tables contain information on network
service access point (NSAP) addresses of nodes in the network and ports of the IS
through which these nodes can be reached. Intermediate systems exchange routing
information regularly with one another as part of the IS-IS protocol by the use of link
state protocol data units (LSP).
The LSPs contain the information on the NSAP addresses of nodes used in the tables
of the RIBs.
Management communication setup concepts
Basic DCN principles
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365-312-875R5.2
Issue 1, March 2007
Alcatel-Lucent - Proprietary
See notice on first page
3-3

DCN configurations
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