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Cisco ONS 15454 DWDM Reference Manual, R8.5
78-18343-02
Chapter 9 Node Reference
9.2.1 Multishelf Node Layout
A multishelf node has a single public IP address for all client interfaces (Cisco Transport Controller
[CTC], Transaction Language One [TL1], Simple Network Management Protocol [SNMP], and HTTP);
a client can only connect to the node controller shelf, not to the subtending shelves. The user interface
and subtending shelves are connected to a patch panel using straight-through (CAT-5) LAN cables.
The node controller shelf has the following functions:
• IP packet routing and network topology discovery occur at the node controller level.
• Open Shortest Path First (OSPF) is centralized on the node controller shelf.
The subtending shelves have the following functions:
• Overhead circuits are not routed within a multishelf node but are managed at the subtending
controller shelf only. To use overhead bytes, the AIC-I must be installed on the subtending shelf
where it is terminated.
• Each subtending shelf will act as a single shelf node that can use as timing source line, TCC/TCC2P
clock, or building integrated timing supply (BITS) source lines.
9.2.1 Multishelf Node Layout
Multishelf configurations are configured by Cisco TransportPlanner and are automatically discovered by
the CTC software. In a typical multishelf installation, all optical units are equipped on the node
controller shelf and TXP/MXP cards are equipped in the aggregated subtended shelves. In addition, all
empty slots in the node controller shelf can be equipped with TXP/MXP cards. In a DWDM mesh
network, up to eight optical sides can be configured with client and optical cards installed in different
shelves to support mesh and ring-protected signal output.
Note When a DWDM ring or network has to be managed through a Telcordia operations support system
(OSS), every node in the network must be set up as multi-shelf. OLA sites and nodes with one shelf must
be set up as "multi-shelf stand-alone" to avoid the use of LAN switches.
9.2.2 DCC/GCC/OSC Terminations
A multishelf node provides the same communication channels as a single-shelf node:
• OSC links terminate on OSCM/OSC-CSM cards. Two links are required between each ONS 15454
node. An OSC link between two nodes cannot be substituted by an equivalent generic
communications channel/data communications channel (GCC/DCC) link terminated on the same
pair of nodes. OSC links are mandatory and they can be used to connect a node to a gateway network
element (GNE).
• GCC/DCC links terminate on TXP/MXP cards.
The maximum number of DCC/GCC/OSC terminations that are supported in a multishelf node is 48.
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