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Cisco ONS 15530 Configuration Guide and Command Reference
78-14227-01, Cisco IOS Release 12.1(10)EV2
Chapter1 Product Overview
CiscoONS 1553 0 Software Features
Optical Supervisory Channel
The Cisco ONS 15530 supports an optional out-of-band management channel for communicating
between systems on the network. Using a 33rdwavelength (channel 0), the OSC allows control and
management traffic to be carried without a separate Ethernet connection to each Ci scoON S15530 in the
network. The OSC always terminates on a neighboring node. By contrast, data chann els may or may not
be terminated on a given node, depending on whether the channels on the OADM modules are treated as
either express (pass-through) or add/drop channels.
The OSC carries the following types of information:
•CDP (Cisco Discovery Protocol) packets—Used to discover neighboring devices
•IP packets—Used for SNMP and Telnet sessions between nodes
•OSCP (OSC Protocol) packets—Used to determine whether the OS C l ink is up us ing a Hell o
protocol
•APS protocol packets—Used for controlling signal path switching
Note When the OSC is not present, Cisco ONS 15530 systems can be managed individually by separate
Ethernet connections.
The OSC is supported by separate modules and motherboards. The OSC is a full duplex channel that can
use a single ring for transmit and receive.
For more information on the OSC and managing Cisco ONS 15530 networks, see Chapter 9,
“Monitoring Your Network Topology.”
In-Band Message Channel
The in-band message channel establishes a method for providing OAM&P (operations, administration,
management, and provisioning) functions in Ethernet packet-based optical networks wit hou t a SONE T
layer or SDH layer. In addition, the in-band message channel enables statistical multiple xing of multiple
logical lower-speed signals, such as ESCON signals, within a single optical data channel. The in-band
message channel terminates with the data channel, not at ea ch no de a s d oes the OSC , th us providi ng
management on a per wavelength basis.
Online Diagnostics
The Cisco ONS 15530 provides the following types of online diagnostic tests:
•Background tests checking system component status and access
•OIR (online insertion and removal) tests for motherboards, cards, and standby processors