You can also refer to the following port-specific CIST information:

•Port number and priority

•Cost

•State

•Role

•Designated bridge and port

•Hello interval

•Link type and port type

The following table describes the CIST parameters.

Table 21 Common Internal Spanning Tree parameter descriptions

Parameter

Description

CIST Root

Shows information about the root bridge for the Common Internal Spanning Tree

 

(CIST). Values on this row of information refer to the CIST root.

CIST Regional Root

Shows information about the root bridge for this MSTP region. Values on this row

 

of information refer to the regional root.

Priority (bridge)

The bridge priority parameter controls which bridge on the network will become

 

the STP root bridge.

MaxAge

The maximum age parameter specifies, in seconds, the maximum time the bridge

 

waits without receiving a configuration bridge protocol data unit before it

 

reconfigures the STP network.

FwdDel

The forward delay parameter specifies, in seconds, the amount of time that a

 

bridge port has to wait before it changes from learning state to forwarding state.

Hops

Shows the maximum number of bridge hops allowed before a packet is dropped.

Priority (port)

The port priority parameter helps determine which bridge port becomes the

 

designated port. In a network topology that has multiple bridge ports connected to

 

a single segment, the port with the lowest port priority becomes the designated

 

port for the segment.

Cost

The port path cost parameter is used to help determine the designated port for a

 

segment. Generally speaking, the faster the port, the lower the path cost. A

 

setting of zero (0) indicates that the cost will be set to the appropriate default after

 

the link speed has been auto-negotiated.

State

Shows the current state of the port. The state field can be one of the following:

 

Discarding (DISC), Learning (LRN), Forwarding (FWD), or

 

Disabled (DSB).

Role

Shows the current role of this port in the Spanning Tree. The port role can be one

 

of the following: Designated (DESG), Root (ROOT), Alternate (ALTN), Backup

 

(BKUP), Master (MAST), or Unknown (UNK).

Designated Bridge

Shows information about the bridge connected to each port, if applicable.

 

Information includes the priority (hex) and MAC address of the Designated Bridge.

Designated Port

The port ID of the port on the Designated Bridge to which this port is connected.

 

Information includes the port priority (hex) and the port number (hex).

Hello

The hello time parameter specifies, in seconds, how often the root bridge

 

transmits a configuration bridge protocol data unit (BPDU). Any bridge that is not

 

the root bridge uses the root bridge hello value.

Type

Type of link connected to the port, and whether the port is an edge port. Link type

 

values are AUTO, P2P, or SHARED.

Information Commands 30

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NEC N8406-022 manual Cist Root, Discarding DISC, Learning LRN, Forwarding FWD, or, Disabled DSB
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N8406-022 specifications

The NEC N8406-022 is a robust and versatile networking device designed primarily for organizations requiring high-performance connectivity solutions. As part of NEC's extensive portfolio of networking equipment, the N8406-022 is engineered to address the demands of modern enterprise environments, ensuring seamless communication and data processing capabilities.

One of the key features of the N8406-022 is its multi-layer switching functionality. This device supports Layer 2 and Layer 3 switching, allowing for efficient data routing and reducing latency within local area networks (LANs). This capability is particularly beneficial for businesses that rely on real-time data access and transfer, such as those in financial services, media, and telecommunications.

The N8406-022 is equipped with advanced Quality of Service (QoS) features that help prioritize critical network traffic. This means that voice and video data packets can be given precedence over less time-sensitive information, ensuring that essential communication remains clear and uninterrupted. This is crucial for organizations leveraging VoIP and video conferencing solutions.

In terms of connectivity, the NEC N8406-022 offers a variety of ports, including multiple Gigabit Ethernet ports, which facilitate high-speed data transfer and enable seamless integration into existing network infrastructures. The device may also include 10 Gigabit SFP+ ports, providing the flexibility for high-capacity uplinks to support bandwidth-intensive applications and storage solutions.

Security is another focal point of the NEC N8406-022, with integrated features such as VLAN support, access control lists (ACLs), and port security measures. These capabilities protect sensitive data from unauthorized access and ensure that only legitimate users and devices can connect to the network.

Moreover, the N8406-022 often incorporates advanced energy-efficient technologies that minimize power consumption without compromising performance. This not only contributes to operational cost savings but also supports organizations in their sustainability efforts.

With its combination of performance, security, and energy efficiency, the NEC N8406-022 stands out as a reliable networking solution suitable for a wide range of enterprises looking to enhance their connectivity and operational efficiency. Whether deployed in data centers or as part of a corporate network, this device is built to meet the evolving demands of today’s digital landscape.
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