Configuring Layer 2 Interfaces

Disabling Link Negotiation

Disabling Link Negotiation

You can disable link negotiation using the no negotiate auto command. By default, auto-negotiation is enabled on 1-Gigabit ports and disabled on 10-Gigabit ports.

This command is equivalent to the Cisco IOS speed non-negotiatecommand.

Note We do not recommend that you enable auto negotiation on 10-Gigabit ports. Enabling auto-negotiation on 10-Gigabit ports brings the link down. By default, link negotiation is disabled on 10-Gigabit ports.

Procedure

 

Command or Action

Purpose

 

Step 1

switch# configure terminal

Enters configuration mode.

Step 2

switch(config)# interface ethernet

Selects the interface and enters interface mode.

 

slot/port

 

 

Step 3

switch(config-if)# no negotiate auto

Disables link negotiation on the selected Ethernet

 

 

interface (1-Gigabit port).

Step 4

switch(config-if)# negotiate auto

(Optional)

 

 

Enables link negotiation on the selected Ethernet

 

 

interface. The default for 1-Gigabit ports is enabled.

 

 

Note

This command is not applicable for 10GBase-T

 

 

 

ports. It should not be used on 10GBase-T ports.

This example shows how to disable auto negotiation on a specified Ethernet interface (1-Gigabit port):

switch# configure terminal switch(config)# interface ethernet 1/1 switch(config-if)#no negotiate auto switch(config-if)#

This example shows how to enable auto negotiation on a specified Ethernet interface (1-Gigabit port):

switch# configure terminal switch(config)# interface ethernet 1/5 switch(config-if)#negotiate auto switch(config-if)#

Configuring the CDP Characteristics

You can configure the frequency of Cisco Discovery Protocol (CDP) updates, the amount of time to hold the information before discarding it, and whether or not to send Version-2 advertisements.

 

Cisco Nexus 5000 Series NX-OS Interfaces Configuration Guide, Release 5.2(1)N1(1)

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Cisco Systems N5KC5596TFA manual Disabling Link Negotiation, Configuring the CDP Characteristics

N5KC5596TFA specifications

The Cisco Systems N5KC5596TFA is a high-performance data center switch designed specifically for modern architectures requiring low-latency, high-bandwidth connectivity. As part of the Nexus 5000 series, the N5KC5596TFA addresses the needs of virtualized environments, cloud computing, and highly dynamic workloads, making it an essential choice for enterprises and service providers.

One of the standout features of the N5KC5596TFA is its impressive port density. The switch offers 48 10 Gigabit Ethernet (10GbE) ports and 4 40 Gigabit Ethernet (40GbE) uplinks, providing flexibility to connect a variety of devices and ensuring high throughput across the network. This port configuration is ideal for connecting multiple servers and storage devices, making it perfect for environments with significant data traffic.

The switch supports a range of advanced technologies such as Virtual Extensible LAN (VXLAN) for improving scalability and multi-tenancy in data center networks. VXLAN encapsulates Layer 2 Ethernet frames within Layer 4 UDP packets, allowing for a larger address space and effective overlay networking, which is crucial for cloud deployments.

Another notable aspect of the N5KC5596TFA is its support for Data Center Bridging (DCB), which enhances the reliability and performance of Ethernet networks. DCB features like Priority Flow Control (PFC) and Enhanced Transmission Selection (ETS) help to minimize data loss and ensure Quality of Service (QoS) for various types of traffic, including storage and regular data, which is critical in a converged infrastructure.

Security is also a priority with the N5KC5596TFA, as it comes equipped with features such as Access Control Lists (ACLs) and port security, helping to safeguard the network from unauthorized access and potential threats.

In terms of management, the switch offers integration with Cisco's Data Center Network Manager (DCNM), providing tools for monitoring, management, and automation, which simplifies operational tasks. Additionally, it supports Cisco's Application Centric Infrastructure (ACI), enabling a more comprehensive and application-focused approach to networking.

Overall, the Cisco Systems N5KC5596TFA is engineered for organizations looking to build robust, highly efficient, and secure data center environments. Its combination of high density, versatile connectivity options, and advanced networking technologies makes it a powerful solution for meeting the demands of today’s enterprise workloads.