Chapter 9 Management Network Connectivity

9.2.4 Scenario 4: Default Gateway on CTC Computer

Figure 9-3 Scenario 3: Using Proxy ARP

CTC Workstation

IP Address 192.168.1.100

Subnet Mark at CTC Workstation 255.255.255.0

Default Gateway = N/A

LAN A

ONS 15600 #1

IP Address 192.168.1.10

Subnet Mask 255.255.255.0

Default Router = N/A

Static Routes = N/A

SONET RING

ONS 15600 #2

IP Address 192.168.1.20

Subnet Mask 255.255.255.0

Default Router = N/A

Static Routes = N/A

ONS 15600 #3

IP Address 192.168.1.30

Subnet Mask 255.255.255.0

Default Router = N/A

81202

Static Routes = N/A

 

ARP matches higher-level IP addresses to the physical addresses of the destination host. It uses a lookup table (called the ARP cache) to perform the translation. When the address is not found in the ARP cache, a broadcast is sent out on the network with a special format called the ARP request. If one of the machines on the network recognizes its own IP address in the request, it sends an ARP reply back to the requesting host. The reply contains the physical hardware address of the receiving host. The requesting host stores this address in its ARP cache so that all subsequent datagrams (packets) to this destination IP address can be translated to a physical address.

Proxy ARP enables one LAN-connected ONS 15600 to respond to the ARP request for ONS 15600s that are not connected to the LAN. (ONS 15600 Proxy ARP requires no user configuration.) For this response to occur, the DCC-connected ONS 15600s must reside on the same subnet. When a LAN device sends an ARP request to an ONS 15600 that is not connected to the LAN, the gateway ONS 15600 returns its MAC address to the LAN device. The LAN device then sends the datagram for the remote ONS 15600 to the MAC address of the proxy ONS 15600. The proxy ONS 15600 uses its routing table to forward the datagram to the non-LAN ONS 15600.

9.2.4 Scenario 4: Default Gateway on CTC Computer

Scenario 4 is similar to Scenario 3, but Nodes 2 and 3 reside on different subnets, 192.168.2.0 and 192.168.3.0, respectively (Figure 9-4). Node 1 and the CTC computer are on subnet 192.168.1.0. For the CTC computer to communicate with Nodes 2 and 3, you would enter Node 1 as the default gateway on the CTC computer.

Cisco ONS 15600 Reference Manual, R7.2

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Cisco Systems ONS 15600 manual Scenario 4 Default Gateway on CTC Computer, Scenario 3 Using Proxy ARP
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ONS 15600 specifications

Cisco Systems ONS 15600 is a highly versatile optical networking platform designed to meet the demands of modern telecommunications and data services. This multiservice edge platform supports various transmission mediums and offers a wide array of features that enable efficient data transport. Ideal for service providers and large enterprises, the ONS 15600 is engineered to provide scalable and reliable optical transport solutions.

One of the notable features of the ONS 15600 is its capability to support multiple protocols, including SONET/SDH, Ethernet, OTN, and legacy TDM services. This flexibility allows users to tailor their networks according to specific service requirements while ensuring interoperability with existing infrastructure. The platform is designed to facilitate seamless service migration, accommodating both legacy and next-generation services.

The modular architecture of the ONS 15600 enhances its scalability. It allows for easy expansion by incorporating additional line cards or interface modules without requiring significant downtime. This modularity ensures that service providers can evolve their networks over time, responding to increasing bandwidth demands and new service offerings with ease.

Incorporating advanced technologies, the ONS 15600 employs Dense Wavelength Division Multiplexing (DWDM), significantly increasing the capacity of fiber networks by allowing multiple signals to be transmitted simultaneously over a single optical fiber. This capability helps to optimize fiber utilization and reduce operational costs. In addition, the platform supports Optical Transport Network (OTN) for improved error detection and correction, contributing to higher reliability and performance.

Another key characteristic of the ONS 15600 is its robust management capabilities. The platform can be managed through Cisco's Optical Networking Manager (ONM), providing a centralized interface for network configuration, monitoring, and troubleshooting. This enhances operational efficiency and minimizes downtime, allowing service providers to focus on delivering quality services to their customers.

The ONS 15600 also prioritizes security, offering various features like encryption and access control to safeguard sensitive data during transmission. With its combination of scalability, flexibility, and security, the Cisco ONS 15600 stands out as a reliable choice for organizations looking to enhance their optical networking capabilities while meeting the evolving demands of the digital landscape. Its commitment to quality and performance makes it a cornerstone of modern optical networks.
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