Manuals / NEC / Computer Equipment / Network Hardware

NEC IP8800/S3600, IP8800/S6600, IP8800/S2400 Communication Failure on IEEE802.3ah/UDLD Function

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

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3. Troubleshooting Functional Failures in Operation

3.18Communication Failure on IEEE802.3ah/UDLD Function

3.18.1Port Becomes Inactive Due to IEEE802.3ah/UDLD Function

If the port becomes inactive due to IEEE802.3ah/UDLD function, isolate the problem by following failure analysis methods shown in the table below.

Table 3-66: Failure Analysis Method When IEEE802.3ah/UDLD Function Is in Use

No.

Troubleshooting Steps and Command

Action

 

 

 

1

Use the show efmoam command to check the

If "Down(loop)" is displayed in Link status, the network configuration which

 

failure type of the port which becomes inactive

causes L2 loop may be adopted. Review the network configuration.

 

due to IEEE802.3ah/UDLD function.

 

 

If "Down(uni-link)" is displayed in Link status, go to No. 2.

 

 

 

 

 

2

Check that IEEE802.3ah/OAM function is

If not enabled, enable IEEE802.3ah/OAM function in the opposite system.

 

enabled in the opposite system.

 

 

If enabled, go to No. 3.

 

 

 

 

 

3

Execute the show efmoam statistics

If Unstable of Info TLV has been incremented, the configuration inhibited

 

command to check the inhibited configuration

for IEEE802.3ah/UDLD function may be adopted. Check that the physical

 

is not adopted.

port is connected to only one system.

 

 

 

 

 

If Unstable of Info TLV has not been incremented, go to No. 4.

 

 

 

4

Check that the system is directly connected to

If the system is connected through the media converter or hub, review the

 

the opposite system.

network configuration so that it is directly connected to the opposite system.

 

 

If it cannot be avoided to use some relay equipment, use the media converter

 

 

which enables the linkage status to be same at both sides (however, not

 

 

recommended).

 

 

 

 

 

If the system is directly connected to the opposite system, go to No. 5.

 

 

 

5

Execute the show efmoam command to check

If the value of "udld-detection-count" is less than the initial value, the

 

the number of response timeout times for

possibility that the one-way link failure is detected erroneously in spite of no

 

detecting the failure.

actual failure is raised. Change the value of "udld-detection-count."

 

 

 

 

 

If the value of "udld-detection-count" exceeds the initial value, go to No. 6.

 

 

 

6

Check settings of the filter and QoS control.

Control frames (slow-protocol) used by IEEE802.3ah/UDLD function may

 

 

have been discarded by filtering or QoS control.

 

 

See "3.23.1 Checking Filtering/QoS Setting Information" to check for it. If

 

 

there is no problem, go to No. 7.

 

 

 

7

Test the line.

Test the line by referencing "6.1 Testing Line." If there is no problem, go to

 

 

No. 8.

 

 

 

8

Check the cable.

Cable may be defective. Replace the cable used at the port.

 

 

 

Note:

IEEE802.3ah/OAM: OAM protocol specified by IEEE802.3ah.

IEEE802.3ah/UDLD: One-way link failure detection function specific to this system using IEEE802.3ah/OAM.

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NEC IP8800/S3600, IP8800/S6600, IP8800/S2400, IP8800/S6700, IP8800/S6300 Communication Failure on IEEE802.3ah/UDLD Function
Page 180 Page 182

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.