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 NE’s.
When a repair tunnel is established, the partition repair designated NE’s will
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 NE’s 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.
WRONG
P
OS
PP
OS
CORRECT
P
Partition repair capable nodes must connect to a
level-2 node in an other area.
Isolated
Level-1 subnetwork
Level-1+2 link
data-communication link (level-1)
LAN
Level-2 LAN
Level-1 tunnel through the Level-2 subdomain
A Level-2 node / router
A Level-1 node / router
A Partition Repair Capable Level-2 node / router
P
Legend:
Management communication setup
Partition repair guidelines
....................................................................................................................................................................................................................................
365-312-807R7.2
Issue 4, May 2007
Alcatel-Lucent - Proprietary
See notice on first page
4-31
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