Dhcp server communication trouble | NEC IP8800/S6700, IP8800/S6600

3.Troubleshooting Functional Failures in Operation

2.Execute the show ip route command to check the route information acquired by this system.

3.Go to "3.7 IPv4 Unicast Routing Communication Failure" if the route information on the failed interface is missing in the route information acquired by this system or if the next hop address is invalid.

4.If the route information acquired by this system contains the route information on the failed interface, the following functions set for the interface may have problem. Check these functions.

•Filtering/QoS function

Go to "(f)Checking filtering/QoS setting information."

•DHCP/BOOTP function

Go to "(g)Checking DHCP/BOOTP setting information."

(f)Checking filtering/QoS setting information

It may have been set to discard only certain packets by filtering, or packets may have been discarded through bandwidth monitoring, discarding control, or shaper of the QoS control.

Check to see if the conditions of filtering and QoS control in the configuration have been set up correctly and if bandwidth monitoring, discarding control, or shaper has been set up appropriately for system operation. For the procedure, see "3.23.1 Checking Filtering/QoS Setting Information."

(g) Checking DHCP/BOOTP setting information

If there are sufficient lease IP addresses remaining in the DHCP/BOOTP server, IP addresses may not be assigned to clients due to configuration setting errors for the DHCP/BOOTP relay. The followings are the steps to check the configuration:

1.Confirm that the IP address of the DHCP/BOOTP server or that of a neighboring router with the DHCP/BOOTP relay agent function has been assigned for ip helper-address.

2.Confirm that ip helper-addresshas been assigned for the client interface.

3.Confirm that ip bootp-hopsis set to a correct "bootp hops" value for the client.

4.For multi-homed configuration, confirm that the "ip relay-agent-address" value matches the IP address subnet distributed by the DHCP/BOOTP server.

(h) Checking when the DCCP relay and VRRP are operated on the same interface

If the DHCP/BOOTP relay and VRRP are operated on the same interface, the DHCP/BOOTP client gateway address (router option) must be set to the virtual router address specified in the VRRP configuration on the DHCP/BOOTP server. Otherwise, communication of the DHCP/BOOTP client may be disabled after master/standby router switching by VRRP. Follow the checking method for each DHCP/BOOTP server.

(2) DHCP server communication trouble

The following are three possible causes for DHCP server communication failures (address not distributed to clients).

1.Configuration error

2.Network configuration has changed

3.DHCP server failure

First, check 1 above. This section describes configurations that are easily misconfigured. For 2 above, check for the differences in the network configuration provided before and after the change. Check for any difference disabling communication. If the configuration and network configuration are correct but IP communications are unavailable because IP addresses cannot be assigned to clients, described in 3 above, see "(b)Checking the log message and interface" through "(e)Checking filtering/QoS setting information" for details.

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

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.

NEC IP8800/S6700 Dhcp server communication trouble, Checking filtering/QoS setting information

Models: IP8800/S6700 IP8800/S3600 IP8800/S6600 IP8800/S6300 IP8800/S2400