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Patch Release Note

PCR: 03524

Module: OSPF, IPG

Level: 2

The SET VLAN BCLIMIT command did not work when executed from start-up in a configuration script. This issue has been resolved.

PCR: 03717 Module: IP, SWCX

Level: 2

New static routes cannot be added to the forwarding database until ARP has resolved the routes' next hop MAC address. In the meantime, selecting the best alternative route was sometimes causing incorrect forwarding and loops. To avoid this situation, packets destined for dead-end routes are now forced to the CPU. The CPU then creates an ICMP_Redirect message to the source of the unforwardable packet to remove the previous hop from its routing table.

In order to force packets back to the CPU, the hardware MAC table contains a special entry for each VLAN that maps the unused MAC address

55.55.55.55.55.55.55.55to the Multicast Group ID 4096. When the switch encounters an unknown next hop MAC address, it now sends the packet to the L2MC Group 4096. Because this group does not exist, the packet is forwarded to the CPU. Note that this process will increment the SHOW SWITCH COUNTER command’s L2MCGroupSoesntExist counter.

PCR: 03726

Module: TTY, USER

Level: 3

When a user logged on twice, thus creating two sessions, the user log on time for the second session was overwriting the value recorded for the first. This issue has been resolved by displaying the log on times as two separate sessions.

PCR: 03727

Module: SWI, STP

Level: 2

Previous STP ports were not being deleted correctly when line cards were hot swapped. Also STP ports were not initialising correctly when STP was not enabled. These issues have been resolved.

PCR: 03734

Module: IPG

Level: 2

With static multicasting enabled on two VLANs, only the first few multicast packets of a stream were L3 forwarded. This issue has been resolved.

PCR: 03736

Module: IPG

Level: 3

The copying of switch routes between internal components was causing processing delays. This issue has been resolved.

PCR: 03739

Module: SWI

Level: 2

Although the SwitchBlade hardware is capable of forwarding jumbo frames, sending these to the CPU was causing a variety of issues. These issues have been resolved.

PCR: 03746

Module: BGP

Level: 3

Attempts to disable BGP debug were, depending on configuration, resulting in either a system failure, or the debug messages continuing to appear after debug had been disabled. This issue has been resolved.

Patch SB251-13 for Software Release 2.5.1 C613-10361-00 REV M

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Allied Telesis SB251-13 manual PCR 03717 Module IP, Swcx Level, PCR Module TTY, User Level, PCR Module SWI, STP Level

SB251-13 specifications

The Allied Telesis SB251-13 is a robust Layer 2 managed switch designed to meet the demands of various networking environments. With a comprehensive set of features, it serves as an ideal solution for enterprises looking to enhance their network infrastructure while maintaining performance and reliability.

One of the standout features of the SB251-13 is its 24 Gigabit Ethernet ports, which provide high-speed connectivity essential for modern applications. This switch supports both copper and fiber connections, making it versatile for different deployment scenarios. Additionally, it includes two SFP (Small Form-Factor Pluggable) ports that enable flexibility in uplink configurations, allowing for connectivity over longer distances with fiber optics.

The switch operates on a Layer 2 architecture, which ensures efficient data handling and robust traffic management. With VLAN (Virtual Local Area Network) support, users can segment their networks for improved traffic isolation and security. This feature is particularly beneficial in environments where segmentation is critical for performance and compliance.

Quality of Service (QoS) is another critical characteristic of the SB251-13, enabling priority-based traffic handling. This means that time-sensitive data, such as VoIP or video streams, can be given precedence over less critical traffic. This prioritization enhances the overall user experience and is vital for ensuring the smooth operation of real-time applications.

Allied Telesis also includes advanced security features in the SB251-13, such as port security, MAC address filtering, and access control lists (ACLs). These measures help protect the network from unauthorized access and potential threats, making it suitable for both enterprise and educational environments.

Power over Ethernet (PoE) support is another significant advantage of the SB251-13. This feature allows the switch to provide power to connected devices like IP cameras, phones, and access points, eliminating the need for separate power sources and making installations cleaner and more efficient.

The SB251-13 is also equipped with a user-friendly web-based management interface, facilitating easy configuration and monitoring. Network administrators can quickly set up, manage, and troubleshoot, streamlining operations and reducing downtime.

In conclusion, the Allied Telesis SB251-13 stands out as a sophisticated managed switch that combines performance, security, and manageability. Its rich feature set makes it a valuable asset for organizations aiming to build a reliable and efficient network infrastructure.