3. Troubleshooting Functional Failures in Operation

Figure 3-9: DHCP Server Failure Analysis Procedure

<IP addresses cannot be assigned to clients.>

Check the configuration.

 

Verify the failure occurrence using the show logging

 

 

command and the show ip interface command.

 

 

 

 

 

 

 

No failure on this

 

 

 

No failure on this system

 

system

 

 

 

(Connected via relay

 

(Connected directly)(

 

 

 

agent)

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

 

Refer to

 

 

 

"(1)DHCP/BOOTP relay communication failure."

 

 

 

 

 

 

 

 

A failure occurred on

this system

 

 

 

 

 

see the manuals "Message Log

 

 

Reference" and "3.6.1 Communication Is

Verify the setting information of filter

and QoS.

 

Disabled or Is Disconnected" and

 

 

perform the actions described in [Action]

 

 

associated with each log message.

 

 

 

(a) Checking configuration

IP addresses may not be assigned to clients due to configuration setting errors for resources on the DHCP server. The followings are the steps to check the configuration:

1.Confirm that the configuration has the "ip dhcp pool" setting including the network setup of the IP address to be assigned to DHCP clients.

2.Using configuration command ip dhcp excluded-address, confirm that the number of pooled IP addresses in the configuration to be assigned to the DHCP clients is not fewer than the number of clients to be used concurrently.

3.If communication between a client and another system is disabled after an address is assigned by this system to the client, the default router may not have been set. Execute configuration command default-routerto confirm that the router address (default router) of the network to which the client is connected has been set up (see the manual "Configuration Commands").

4.Check the setting of the system as the DHCP relay agent. If this system is also used as the relay agent, see "(1)DHCP/ BOOTP relay communication failure."

(b) Checking the log message and interface

On possible cause for the server not assigning IP addresses to clients, the communication client between cliant and server may have been disabled. Check the log message displayed on this system or the interface up/down status using the show ip interface command. For the procedure, see "3.6.1 Communication Is Disabled or Is Disconnected."

(c)Identifying the extent of the failure (performed from this system)

If no failure is found on this system, a failure may exist somewhere in the route between this system and the remote system. The procedure to locate the failure in the route to the remote system and identify the failure range is as follows:

1.Log in to the system.

2.If a router is provided between the server and the client, use the ping command to verify communication of the system (router) between the server and the other system (DHCP client) to which communication is disabled. If

57

Page 118 Page 120
Page 119
Image 119
NEC IP8800/S6300 manual Checking configuration, Checking the log message and interface, Associated with each log message
Page 118 Page 120

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.
Top Page Image Contents