Specifications

1-2
Cisco ONS 15454 SONET/SDH Unified Control Plane Configuration Guide
OL-4214-01
Chapter 1 Overview
1.2UNI Implementation
Client and Network Roles
UNI is divided into client (UNI-C) and network (UNI-N) roles. A UNI-C network element requests and
accepts circuit provisioning information. A UNI-N network element is the node adjacent to the UNI-C
node and accepts and transports circuit provisioning information across the core network. For UNI
circuit provisioning, the network must meet the following requirements:
An NE must be configured in as UNI-C and connected to a UNI-N NE. Normally, the UNI-C NE is
a border NE in the client network.
An NE must be configured as UNI-N and connected to a UNI-C NE. Normally, the UNI-C NE is a
border NE in the core network.
The ONS 15454 SONET and SDH Releases 3.4 and 4.0 support UNI-C provisioning.
Figure 1-1 shows the position of the ONS 15454 (either SONET or SDH) in a customer network
environment. In this example, Node 4 can request Node 9 as a circuit destination. Node 5 handles the
signal and establishes a circuit through the metro core. The ONS 15454 networks on either side of the
core network are aware only that they are connected to the core at Node 5 and Node 8, respectively.
Note Nodes 5 and 8 must support the UNI-N feature for UNI-C on the ONS 15454 to work.
Figure 1-1 UNI-C Nodes Connected to the Core Network
Adjacent Node Communication
Adjacent UNI-C and UNI-N NEs, called “neighbors,” communicate over a control channel. A control
channel is a logical channel between two neighbors that have one or more links capable of carrying data.
Link management protocol (LMP) establishes and maintains control channel connectivity between
neighbors. LMP also enables neighbor discovery, which allows neighbors to identify connected devices;
obtain UNI connectivity information; and identify and verify port-level connections, network-level
addresses, and corresponding operational states for every link.
Each control channel has a unique 16-bit identification number, called a CCID. Each end of a control
channel requires a local IP version 4 (IPv4) or IP version 6 (IPv6) control channel (IPCC) address. By
default, this address is the internal address of each neighbor, but can be a different address.
90614
Node 6
Node 7
Node 5 Node 8
Node 2
Node 3
ONS 15454
Network
Node 1 Node 4
Node 10
Node 11
ONS 15454
Network
Node 9 Node 12
Metro Core
ONE
UNI-C
UNI-N
UNI-C
UNI-N
ONE
Core Network
ONE
ONE