Alcatel-Lucent 1643 AMS User's Operation Manual page 122

Management communication setup
Large network restrictions
Observe the following restrictions regarding large networks:
• The manager connections that are tunneled 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
connections.
The total number of managed NE's in an area can be tunneled through the Level-2
subdomain with regard to the maximum number of manager connections that can
be forwarded by a node. Only the shortest inter-area route between two Partition
Repair Capable nodes in an area has to be taken into account.
• The manager connections that are received, encapsulated and forwarded into a
partition-repair tunnel, are counted as normal connections. If 100 manager
connections can be tunneled in case of a failure, the related partition designated
node must be capable of forwarding 100 manager connections.
• All areas can be provisioned to have one or more Partition Repair Capable node(s).
Each area with one or more Partition Repair Capable nodes requires an extra entry
in the routing table (RIB), because of initial selection of a partition repair
designated node per area..
• Avoid the use of partition repair capable NE's in large areas.
A DCN network design that selects small level-1 areas to use partition repair, while
the large areas are rings that need no partition repair, will be easier to understand.
Also it is easier to check that all rules are obeyed.
Partitioning restrictions
A maximum of nine partition repair capable NEs per area is allowed. This implies that
the partition repair capable NEs can terminate a maximum of eight partition repair
tunnels. A single cable cut may imply many fiber cuts, of which more than 7 of those
fiber cuts may imply partitioning of the same area. A fiber cut between two DWDM
nodes may imply a cut of many DCC channels. The Network design shall not use
partition repair to cover such topologies.
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4-32 Alcatel-Lucent - Proprietary
See notice on first page
Partition repair guidelines
365-312-807R7.2
Issue 4, May 2007