3.Troubleshooting Functional Failures in Operation

3.6.2IP Addresses Cannot Be Assigned Using DHCP Function

(1)DHCP/BOOTP relay communication failure

There are three possible causes for DHCP/BOOTP relay communication failures:

1.Configuration relating to DHCP/BOOTP relay has changed

2.Network configuration has changed

3.DHCP/BOOTP server failures

For 2 above, check for the differences in the network configuration provided before and after the change. Check for any difference disabling communication.

Assuming that client settings (network card setting, cable connection, etc.) have been verified, this section describes the procedure for locating the faulty part and cause in the cases described such as "IP addresses are not assigned from the DHCP/BOOTP server as a result of changing the configuration." and "Although the configuration and network configuration are correct, IP addresses are not assigned and IP communication is disabled" as in above No. 1 and 3.

To locate the faulty part and cause, follow the flow below.

Figure 3-8: Troubleshooting on DHCP/BOOTP Relay

 

 

 

 

 

 

< IP addresses cannot be assigned to clients.>

 

 

 

 

 

 

 

 

 

Verify if there is a failure occurrence using the show logging command or the show ip

 

 

interface command.

No failure

A failure exists.

exists.

 

 

 

 

 

See the manuals "Message Log

 

 

Reference" and "3.6.1 Communication Is

 

 

Disabled or Is Disconnected" and perform

Identify the extent of failure using the

 

the actions described in [Action]

ping command.

 

 

associated with each log message.

 

 

 

 

 

Communication between the neighboring host and router is disabled.

Verify the status of address

resolution using the show ip arp

command.

Unresolved

Communication between remote host and router is disabled.

Solved Verify the route information using the show ip route command.

 

The next-hop

No route

information

address is invalid.

exists.

 

 

 

The route

information

exists.

 

 

 

Verify the IP network of remote

Analyze the failure on each

system. Otherwise, go to

 

routing protocol.

"3.4 Network Interface

 

(RIP, BGP, etc.)

Communication Failure."

 

 

 

 

 

 

 

 

Verify the setting

 

Verify the setting

information of filter and

 

information of DHCP and

QoS.

 

BOOTP.

 

 

 

54

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NEC IP8800/S3600, IP8800/S6600 IP Addresses Cannot Be Assigned Using Dhcp Function, DHCP/BOOTP relay communication failure
Page 115 Page 117

IP8800/S6700, IP8800/S3600, IP8800/S6600, IP8800/S6300, IP8800/S2400 specifications

The NEC IP8800 series comprises a range of advanced networking solutions designed for various applications ranging from enterprise networking to service provider environments. This series includes models such as the IP8800/S2400, IP8800/S3600, IP8800/S6300, IP8800/S6600, and IP8800/S6700, each with its unique set of features and capabilities aimed at delivering robust performance, security, and scalability.

The IP8800/S2400 is an entry-level switch tailored for small to medium enterprises. It features a compact design and high port density, making it ideal for network edge applications. The model supports both Layer 2 and Layer 3 switching capabilities, enabling efficient traffic management. With its robust security features, including access control lists and support for VLANs, the IP8800/S2400 ensures secure connectivity.

Moving to the IP8800/S3600, this switch is designed for data center environments and offers high throughput with advanced routing capabilities. It is equipped with high-capacity 10G and 40G Ethernet ports, facilitating faster data transfer rates. The S3600 supports various protocols such as MPLS and Segment Routing, enhancing its ability to manage complex network architectures. Its energy-efficient design also helps reduce operational costs.

The IP8800/S6300 is tailored for high-performance networking scenarios, featuring a flexible architecture that supports both traditional and cloud-based services. With extensive QoS capabilities, the S6300 optimizes traffic flow and manages bandwidth efficiently, ensuring high-quality service delivery. Its virtualization support allows for easier integration into modern, software-defined networking environments.

The IP8800/S6600 provides a comprehensive solution for service providers and large enterprises, boasting high scalability and modularity. This model supports advanced features such as network slicing and the ability to handle high-density 100G interfaces. Its robust management tools, including centralized control and automation capabilities, simplify network operations significantly.

Finally, the IP8800/S6700 represents the pinnacle of the series, designed for mission-critical applications requiring the utmost reliability and performance. It supports advanced analytics, AI-driven insights, and comprehensive telemetry, enabling proactive network management. With high availability features and extensive redundancy options, the S6700 ensures continuous operation, making it ideal for core network functions.

In summary, the NEC IP8800 series offers a versatile range of switches that combine advanced technologies, high performance, and robust security features, catering to various networking needs across different industries. Each model is designed to provide not only superior connectivity but also the flexibility and scalability required in today’s fast-paced digital landscape.
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