White Paper Abstract:
Cisco Transport Manager is the element management system (EMS) for the Cisco ONS 15000 family of optical networking system products. Integrating fault, conguration, and performance management capabilities, Cisco Transport Manager streamlines and strengthens optical network operation, administration, maintenance, and provisioning (OAM&P). One of the new features introduced with the Cisco Transport Manager Release 3.0 is the management of the double IP address to support access to the Cisco ONS 15800 Series nodes through two different gateways using Layer 3 routing instead of Layer 2 bridging. This capability requires conguration of the data communication network (DCN) using the Network Address Translation (NAT) approach as it is described in this document. A feature enabled by the Internet Protocol Version 4 (IPv4) and later versions, NAT is usually exploited in two different situations:
• When Internet service providers or, in general, any administrative domains, have a shortage of public IP addresses-The typical situation is a larger subnet covered with a small private pool of IP addresses that need access to the Internet • When a subnet needs to be visible and gets access to the Internet through alternative routes-This is the implementation for the Cisco ONS 15800 Series DCN