3Com 3CB9LF20MM, 3CB9LF36RL, 3CB9LF36TL, 3CB9LG9MC, 3CB9LF20R manual Secure Address Learning Mode

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Secure Address Learning Mode 21

The source address in an incoming packet must match a static address that you have configured on a port before the packet can enter that port. If an incoming packet contains a different source address than the one set for the port, the module shuts the port down and you must bring the port back online manually.

In secure mode, the module does not learn “unauthorized” source addresses.

To use this command:

1In the bridge learnMode menu, select whether you want to put the module into secure mode (or restore the module to normal mode).

The default setting is normal.

Example:

CB9000@slot 3.1 [36L-E/FEN-TX-L2] (): bridge

Menu options (CoreBuilder 9000-F5EAC):

-----------------------------------------

display

- Display bridge information

agingTime

- Set the bridge address aging time

cos

- Administer COS priority queues

port

- Administer bridge ports

multicast

- Administer multicast filtering

vlan

- Administer VLANs

loopDetectMode

- Set Loop Detect mode

learnMode

- Set the bridge learning mode

CB9000@slot 3.1 [36L-E/FEN-TX-L2] (bridge): learnMode Secure mode option will flush dynamic addresses. (normal,secure) [normal]:

As shown in the above example, the system displays a warning that secure mode flushes existing dynamically learned addresses.

2If you select the secure mode, you can then use the bridge port address command to configure static addresses for the individual ports that you want to secure. Any static addresses that you define on these ports are used to screen packets that arrive at these ports.

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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 CDISO Date and Time FormatNew Modules 10/100 Mbps Ethernet Port Monitoring QueryingSnooping 802.1p CoS Loop DetectionCoreBuilder 9000 Implementation Guide for more details Release Highlights LoopDetectMode loopDetectSrcAddress Enable 08-00-8f-75-48-86 LoopDetectStatus Bridge Address Learning LimitsAddresses 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 ChangesDocumentation 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 Entering Commands UnderstandingAutonegotiation Year Compliance3Com Year 2000 Web Services ServicesTechnical Support Online TechnicalAccess by Analog Modem Username anonymousModem Isdn 24 hours a day, 7 days a week Access by Digital Modem 847 262408 727 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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