NE type restrictions
Observe the following NE type restrictions:
•
All NE types, managers, and other OSI nodes (like external OSI routers) are
allowed as level 1 IS nodes or as ES-only nodes, in an area with partition repair
capable NEs.
When a repair tunnel is established, the partition repair designated NEs advertise
information such, that the tunnel is identified as a normal level-1 route within the
area.
•
All NE types and other OSI nodes (like external OSI-routers) are allowed as level
2 nodes in the level 2 subdomain, as long as they are not part of the shortest
inter-area path between two partition repair capable NEs in an area.
The network is expected to be designed for full management connectivity in case
of a single failure. In case of two failures, including a partitioned area and a failure
in the shortest potential tunnel route, the network is allowed to drop management
connections. Therefore not all OSI nodes in the level 2 subdomain need to be
partition compatible.
Large network restrictions
Observe the following restrictions regarding large networks:
•
The manager connections that are tunnelled through a level 2 node in case of a
single failure, are counted as connections and must therefore be subtracted (like all
other rerouted connections through this node) from the maximum number as
specified in S-111 in order to identify the maximum number of acceptable
connections in the case that the network is in its normal (failure-free) state.
If 50 manager connections can be tunneled in case of a failure, and 150 manager
connections are forwarded in a failure-free network, through one of the nodes in
the potential tunnel, the related node must be capable of forwarding 200 manager
Management communication setup concepts
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365-312-875R5.2
Issue 1, March 2007
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