3Com Router 5000 and Router 6000 Family

Release Notes v2.41 • Page 11

On an ISDN interface, the Line Protocol state is up when no cable is attached to the port on the interface. It is best to observe the interface’s Current State. The Current State will be down if no cable is attached to the interface even though the Line Protocol will show it as up.

A Frame Relay sub-interface that has been configured as “Down” transmits packets.

Displaying a Fractional E1 interface displays a Frame Format equal to NONE. The actual Frame Format is no-crc.

Frame Relay Payload Compression is displayed for PVC even after it is removed. Reset the interface to resolve.

Display interface for an ATM interface with sub-interfaces will display the same cumulative statistical information - no individual statistics are provided; Instead use, display atm interface to show more individualized statistics.

An ATM PVC that is set with rate limiting and is heavily oversubscribed with data, will fail to pass traffic. Other PVCs continue to work on the link.

Changing the speed on a modem interface resets the interface. Do not change the modem interface speed while a dialup session is active.

The activity LED on the T3 ATM Module indicates heavy activity regardless of the amount of traffic passing through it.

Regardless of actual traffic running or not, T3 and E3 activity LEDs blink constantly.

3.5Link Layer Protocol

A frame relay link will not come up if the IP Address is changed, because the fr inarp table is not refreshed. The user must reset the fr inarp table manually.

Alarm-threshold values are not configurable when a T1-line is configured within a T3 link.

Level-4 alarm-threshold is not supported for T1 links setup for SF frame format. The CLI will not report an error.

ATM AIS/RDI statistics are inaccurate.

ATM OAM Segment Loop cells are not supported.

Frame Relay PVCs can be modified when they are part of a PVC switching endpoint. Verify first that the interface is not a PVC endpoint before making any changes, else traffic may be disrupted.

There is no DEBUG support for Multilink Fragmentation (FRF.16.1).

Status and statistics for Multilink Fragmentation (FRF.16.1) cannot be viewed

There is no support for ISDN switch type AT&T for BRI U interfaces. The router Command Line Interface and the documentation specifically states that AT&T is only supported on PRI interfaces. The default isdn protocol-type dss1 will connect to switches using AT&T switch type on a BRI interface. This was tested with Lucent 5E, otherwise known as AT&T 5ess.

Bridge-set traffic cannot be routed even though a bridge-set can be configured with an IP address.

FRF.9 Compression is still displayed upon viewing of PVC statistics, after the PVC is re- mapped without FRF.9. After re-mapping a PVC to exclude FRF.9 compression, reset the interface in order to clear any reference to FRF.9

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3Com 5000, 6000 manual Link Layer Protocol

5000, 6000 specifications

The 3Com 6000 series, launched in the late 1990s, was a significant advancement in networking technology, designed to meet the growing demands of enterprise-level networking. This series provided powerful solutions for businesses seeking reliable, efficient, and scalable networking capabilities.

At its core, the 3Com 6000 series featured a modular design, allowing companies to customize their networks according to specific needs. This flexibility meant that organizations could add or replace components as their networking requirements evolved, ensuring investment protection and a tailored approach to connectivity. The ability to scale was particularly important for businesses that anticipated growth or change in operational demands.

One of the standout features of the 3Com 6000 was its advanced switching capabilities. The series employed high-performance switching technologies that supported various protocols, including Fast Ethernet and Gigabit Ethernet. This versatility made it suitable for diverse environments, from small offices to large corporate settings. The 3Com 6000 switches were engineered to deliver high throughput and low latency, crucial for applications requiring real-time data transfer.

The series also supported a range of network management tools, enhancing operational efficiency. With SNMP (Simple Network Management Protocol) support, network administrators could easily monitor and manage network performance, troubleshoot issues, and configure devices from a centralized location. This capability significantly streamlined network operations, reducing downtime and optimizing resource allocation.

Security was another significant concern addressed by the 3Com 6000. The series incorporated robust security features, including access control lists (ACLs) and VLAN (Virtual Local Area Network) support. These features allowed network administrators to segment traffic and enforce security policies, protecting sensitive data and ensuring compliance with organizational standards.

Moreover, the 3Com 6000 series was designed with energy efficiency in mind, reflecting a growing awareness of the environmental impact of IT infrastructure. By implementing power-saving features, the series helped organizations reduce their overall energy consumption while maintaining optimal network performance.

In summary, the 3Com 6000 series stood out for its modularity, advanced switching capabilities, extensive management tools, strong security features, and energy efficiency. It represented a forward-thinking solution for enterprises aiming to build robust network infrastructures capable of supporting a wide range of applications and services. As organizations increasingly relied on networked systems, the 3Com 6000 played a crucial role in shaping the landscape of enterprise networking.