CHAPTER
12-1
Cisco ONS 15454 SDH Reference Manual, R5.0
April 2008
12
CTC Network Connectivity
This chapter provides nine scenarios showing Cisco ONS 15454 SDH nodes in common IP network
configurations as well as information about provisionable patchcords, the routing table, external
firewalls, and open gateway network element (GNE) networks. The chapter does not provide a
comprehensive explanation of IP networking concepts and procedu res. For IP set up instructions, refer
to the “Turn Up Node” chapter of the Cisco ONS 15454 SDH Procedure Guide.
Chapter topics include:
•12.1 IP Networking Overview, page 12-1
•12.2 IP Addressing Scenarios, page 12-2
•12.3 Provisionable Patchcords, page 12-21
•12.4 Routing Table, page 12-23
•12.5 External Firewalls, page 12-25
•12.6 Open GNE, page 12-27
Note To connect ONS 15454 SDH nodes to an IP network, you must work with a LAN administrator or other
individual at your site who has IP networking training and experie nce.

12.1 IP Networking Overview

ONS 15454 SDH nodes can be connected in many different ways within an IP environment:
•They can be connected to LANs through direct connections or a router.
•IP subnetting can create ONS 15454 SDH login node groups that allow you to provision non-data
communications channel (DCC) connected nodes in a network.
•Different IP functions and protocols can be used to achieve specific network goal s. For example,
Proxy Address Resolution Protocol (ARP) enables one LAN-connected ONS 15454 SDH to serve
as a gateway for ONS 15454 SDH nodes that are not connecte d to the LAN.
•Static routes can be created to enable connections among multiple Cisco Transport Controller (CTC)
sessions with ONS 15454 SDH nodes that reside on the same subnet with multiple CTC sessions.
•ONS 15454 SDH nodes can be connected to Open Shortest Path First (OSPF) networks so
ONS 15454 SDH network information is automatically communicated across multiple LANs and
WANs.