3Com 3CB9LF20MM, 3CB9LF36T, 3CB9LF36RL, 3CB9LG9MC Entering Commands, Understanding, Autonegotiation

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Entering Commands 53

■3cVlan.mib — 3Com VLAN MIB (43.10.1.14.1).

■3cWeb.mib — 3Com Web Management MIB (43.29.4.24).

■cb9000Mod.mib — Layer 2 and Layer 3.

MIB names and numbers are usually retained when organizations restructure their businesses; therefore, some of the 3Com Enterprise MIB names may not contain the word “3Com.”

Entering Commands

Before you enter any command, 3Com recommends that you:

■Examine all menus and submenus carefully to obtain the complete and correct command string.

■Consult the documentation for the valid minimum abbreviation for the command string.

Understanding

The autonegotiation capability on CoreBuilder 9000 Fast Ethernet and

Autonegotiation

Gigabit Ethernet Layer 2 switching modules functions in compliance with

 

the IEEE 802.3z specification. In Gigabit Ethernet modules,

 

autonegotiation coordinates flow control parameters between local and

 

remote ports. Both ends of the Gigabit Ethernet connection must support

 

autonegotiation and have it enabled for the connection to work properly.

 

If autonegotiation is implemented or configured differently on local and

 

remote connected ports, unexpected results or link failures may result.

 

For example:

 

■ If a Gigabit Ethernet switching module port has autonegotiation

 

enabled but the remote end of the connection does not support

 

autonegotiation or has it disabled, the local module port does not

 

come up (the module port state is off-line, the port LED is off, and the

 

autonegotiation state is configuring).

 

■ If a Gigabit Ethernet switching module port has autonegotiation

 

disabled but the remote end of the connection has autonegotiation

 

enabled, no traffic flows in either direction between the ports.

 

However, the module port state and port status still display online

 

and enabled, respectively. Also, if Spanning Tree is enabled, the

 

linkstate is up and the module port state is forwarding.

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Contents CoreBuilder Release Notes 3Com Corporation 5400 Bayfront Plaza Santa Clara, California Contents Release Issues Software Installation Page Overview Management Information Bases MIBs System Boot CodeRequirements Operational Code3CB9LG9MC RedundancyIgmp Release HighlightsWeb-based CoreBuilder 9000 Enterprise SwitchManagement Software CDNew Modules ISO Date and TimeFormat Snooping 10/100 Mbps Ethernet Port MonitoringQuerying CoreBuilder 9000 Implementation Guide for more details 802.1p CoSLoop Detection Release Highlights LoopDetectMode loopDetectSrcAddress Enable 08-00-8f-75-48-86 LoopDetectStatus Addresses Bridge AddressLearning Limits Secure Address Learning ModeAddresses are taken from the per-port address allocations See the previous section Bridge Address Learning LimitsSecure Address Learning Mode Vlan Multicast, BroadcastFlood Rate Limiting Vlan as the arriving packetMulticastlimit Limiting is on a per-port basis only Release Highlights Corrected Problems Release IssuesSystem ManagementWhenever a non-switch fabric module is reset with Staging VLANsWeb-based System Issues Model Number 3CB9LF36RL or 3CB9LF36TL to act as an Igmp Modules have only one backplane portModule TrunkingSystem Issues Release Issues Known Problems Release Issues Known Problems Modify command Administration Console of the 36-port 10/100BASE-TX FastNot reset after you enter the module baseline set command If a trunk is configured on a module, the following fieldsKnown Problems Documentation DocumentationChanges Software Installation At the EME prompt, enter ChassisOrder specified in the following procedure Your module for guidelines and proceduresVerifying ModulesFollowing procedure explains how to download software Power to these module slotsSoftware next in this chapter ModulesShow module slot.all verbose From the EME, connect to the module You must complete to ensure that the module is updated Downgrading Switching Modules to Software Release Reference SwitchIdentifying Modules3CB9LG2MC Documents ApplicableMIB Files CoreBuilder 9000 Implementation GuideReference Autonegotiation Entering CommandsUnderstanding 3Com Year 2000 Web YearCompliance Services ServicesTechnical Support Online TechnicalModem Isdn 24 hours a day, 7 days a week Access by Analog ModemUsername anonymous 408 727 Access by Digital Modem847 262 Europe Country Telephone Number North America

3CB9LF36R, 3CB9LF36TL, 3CB9LF20R, 3CB9LF36RL, 3CB9LF36T specifications

The 3Com 3CB9LF20MM, 3CB9LF10MC, 3CB9LG9MC, 3CB9LF36T, and 3CB9LF36RL are advanced networking solutions that exemplify the commitment of 3Com to delivering high-performance products for both small and large enterprises. These models feature varying specifications to accommodate different network demands while ensuring reliability and efficiency.

The 3CB9LF20MM model is designed with flexibility in mind, making it an ideal choice for small to medium-sized businesses. It supports multiple network protocols ensuring seamless integration and is equipped with enhanced security features that protect sensitive data. This model excels in environments that require high-speed connectivity and robust throughput.

Next, the 3CB9LF10MC stands out due to its compact design, making it perfect for businesses with limited space. It offers exceptional performance while maintaining low power consumption, enabling organizations to reduce their carbon footprint. This unit also includes advanced Quality of Service (QoS) features, allowing administrators to prioritize critical applications and ensure optimal network performance.

The 3CB9LG9MC is particularly noteworthy for its scalability. It is engineered to support growing network demands and can accommodate a substantial number of users without compromising performance. This model leverages cutting-edge technologies, such as advanced VLAN support and multicast routing, to facilitate efficient network management. Its robustness makes it suitable for larger enterprise environments or data-intensive applications.

The 3CB9LF36T model is designed for high capacity and speed, making it suitable for organizations that require increased bandwidth. This switch can handle heavy traffic loads effectively, ensuring smooth operation for bandwidth-intensive tasks and applications. Additionally, it comes equipped with multiple gigabit Ethernet ports, providing flexibility for various network configurations.

Lastly, the 3CB9LF36RL model features redundancy and failover capabilities, making it an excellent choice for mission-critical environments. The design emphasizes reliability, with built-in features that allow for uninterrupted service, even in the face of hardware failures. This model ensures continuous connectivity, an essential requirement for organizations where downtime can lead to significant financial loss.

In summary, the 3Com 3CB9 family of networking solutions offers a diverse array of features and technologies designed to meet varying organizational needs. From scalability and security to high capacity and reliability, these models cater to a broad spectrum of networking requirements, ensuring that businesses can maintain optimal performance in their operations.
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