Command Line Interface

Command Usage

When auto-negotiation is enabled with the negotiation command, the switch will negotiate the best settings for a link based on the capabilities command. When auto-negotiation is disabled, you must manually specify the link attributes with the speed-duplex and flowcontrol commands.

Example

The following example configures Ethernet port 5 capabilities to 100half, 100full and flow control.

Console(config)#interface ethernet 1/5

Console(config-if)#capabilities 100half

Console(config-if)#capabilities 100full

Console(config-if)#capabilities flowcontrol

Console(config-if)#

Related Commands

negotiation (4-86)speed-duplex(4-85) flowcontrol (4-88)

flowcontrol

This command enables flow control. Use the no form to disable flow control.

Syntax

[no] flowcontrol

Default Setting

Flow control enabled

Command Mode

Interface Configuration (Ethernet, Port Channel)

Command Usage

Flow control can eliminate frame loss by “blocking” traffic from end stations or segments connected directly to the switch when its buffers fill. When enabled, back pressure is used for half-duplex operation and IEEE 802.3x for full-duplex operation.

To force flow control on or off (with the flowcontrol or no flowcontrol command), use the no negotiation command to disable auto-negotiation on the selected interface.

When using the negotiation command to enable auto-negotiation, the optimal settings will be determined by the capabilities command. To enable flow control under auto-negotiation, “flowcontrol” must be included in the capabilities list for any port

Avoid using flow control on a port connected to a hub unless it is actually required to solve a problem. Otherwise back pressure jamming signals may degrade overall performance for the segment attached to the hub.

4-88

Page 234
Image 234
Accton Technology VS4512DC manual Flowcontrol, Syntax No flowcontrol Default Setting

VS4512DC, VS4512 specifications

Accton Technology is renowned for its innovative networking solutions and has made significant strides in the realm of networking devices with its VS4512 and VS4512DC models. These devices cater primarily to the advanced needs of enterprise and data center environments, providing robust features and cutting-edge technologies that enhance network performance and reliability.

The Accton VS4512 is a high-performance Layer 2+ switch designed for top-of-rack applications in data centers. It boasts a compact 1U design, making it highly efficient for space-constrained environments. One of its standout features is the support for Ethernet Flow Control, which significantly reduces data loss during peak traffic loads. This is essential for businesses that rely on real-time data processing and streaming.

In terms of scalability, the VS4512 supports up to 48 Gigabit Ethernet ports, which can be expanded using four 10 Gigabit SFP+ uplink ports. This flexibility allows enterprises to customize their network architecture to meet their growing demands, whether they are scaling up for more users or enhancing service capabilities.

The VS4512DC, on the other hand, is the DC version tailored for data centers. It offers similar features as the VS4512 but includes enhancements for power efficiency and redundancy, ensuring that operations can continue smoothly even in power outage scenarios. The VS4512DC features dual power supplies and advanced thermal management, allowing for improved heat dissipation and lower operational costs.

Both models support advanced Layer 3 routing capabilities, enabling efficient traffic management across complex networks. They also incorporate features like VLAN segmentation and link aggregation, which facilitate better bandwidth utilization and improved network security.

Security is another cornerstone of these switches, with features such as DHCP snooping, port security, and storm control to mitigate risks associated with unauthorized access and network congestion.

In summary, the Accton Technology VS4512 and VS4512DC switches represent significant advancements in networking technology, equipped with a comprehensive set of features tailored for modern enterprise needs. With their scalability, robust performance, and focus on security, these switches are positioned to meet the challenges of today's fast-paced digital environments, making them a preferred choice for organizations aiming to enhance their network infrastructure.