Common Internal Spanning Tree configuration

The Common Internal Spanning Tree (CIST) provides compatibility with different MSTP regions and with devices running different Spanning Tree instances. It is equivalent to Spanning Tree Group 0.

The following table describes the commands used to configure CIST commands.

Table 80 CIST Configuration commands

Command

Description

spanning-tree mstp

Adds VLANs to the CIST. Enter one VLAN per line, and press Enter to add the

cist-add-vlan <1-4095>

VLANs. Command mode: Global configuration

default spanning-tree

Resets all CIST parameters to their default values.

mstp cist

Command mode: Global configuration

show spanning-tree mstp

Displays the current CIST configuration.

cist

Command mode: All

CIST bridge configuration

CIST bridge parameters are used only when the switch is in MSTP mode. CIST parameters do not affect operation of STP/PVST.

The following table describes the commands used to configure CIST Bridge Configuration commands.

Table 81 CIST Bridge Configuration commands

Command

Description

spanning-tree mstp cist-

Configures the CIST bridge priority. The bridge priority parameter controls

bridge priority {<0-65535>}

which bridge on the network is the MSTP root bridge.

 

To make this switch the root bridge, configure the bridge priority lower than

 

all other switches and bridges on your network. The lower the value, the

 

higher the bridge priority. The range is 0 to 65535, and the default is

 

32768.

 

This command does not apply to RSTP. See the "Bridge Spanning Tree

 

configuration" section for more information.

 

Command mode: Global configuration

spanning-tree mstp cist- bridge maximum-age {<6-40>}

Configures the CIST bridge maximum age. The maximum age parameter specifies the maximum time the bridge waits without receiving a configuration bridge protocol data unit before it reconfigures the MSTP network. The range is 6 to 40 seconds, and the default is 20 seconds. This command does not apply to RSTP. See the "Bridge Spanning Tree configuration" section for more information.

Command mode: Global configuration

spanning-tree mstp cist- bridge forward-delay {<4-

30>}

Configures the CIST bridge forward delay parameter. The forward delay parameter specifies the amount of time that a bridge port has to wait before it changes from the listening state to the learning state and from the learning state to the forwarding state. The range is 4 to 30 seconds, and the default is 15 seconds.

This command does not apply to RSTP. See the "Bridge Spanning Tree configuration" section for more information.

Command mode: Global configuration

show spanning-tree mstp cist Displays the current CIST bridge configuration. Command mode: All

Configuration Commands 76

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NEC N8406-022 manual Common Internal Spanning Tree configuration, Cist bridge configuration
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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.

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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.

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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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