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Patch Release Note

Prefixes of Anycast addresses could not be shared on the same port. This issue has been resolved.

PCR: 3956

Module: SWI, CORE

Level: 2

On an AT-9800 with certain third party GBICs, running the restart reboot command would cause the switch to lock-up. However the problem did not occur when using the Reset button. This issue has been resolved by disabling all ports before performing a RESTART REBOOT.

PCR: 03965

Module: IPSEC

Level: 2

IPv6 was using the same SA (security association) soft expiry timer at both ends of link. This was wasting CPU and memory resources. This issue has been resolved.

PCR: 03966 Module: MLDS

Level: 2

A multicast listener discovery (MLD) snooping entry was incorrectly added to the SwitchBlade’s layer two multicast address table.

The AT-9800 was not adding layer two MLD Snooping when additional

VLANs were created.

The failure of a SwitchBlade port was causing restarts due to the switch attempting to remove the port from a “non existent” MLD Snooping list.

These three issues have been resolved.

PCR: 03968

Module: OSPF

Level: 2

Large routing areas, containing many hosts and interfaces, were causing fatal errors due to the excessive number of link state advertisements generated. This issue has been resolved by limiting the combined number of routers and hosts within each area to 100.

PCR: 03973

Module: SWI

Level: 3

The IP option field for trace route was not being filled correctly when equal cost multipath routes were used. This has now been fixed.

PCR: 03986

Module: BGP, IPG

Level: 2

Route flapping was occurring when an interface went down and there was another path to the next hop. This issue has been resolved.

PCR: 03991

Module: CFLASH

Level: 2

A fatal error would occur if a file whose name contained Japanese characters was deleted from compact flash. This issue has been resolved.

PCR: 03991

Module: SWCX, SWI

Level: 2

In configurations containing many VLANs, temporary lockups were frequently occurring while the hardware tables were being updated. This patch substantially reduces the severity of these lockups.

PCR: 031000 Module: SWCX, SWI

Level: 3

Running the SHOW IP IGMP COUNTER command was displaying zero values for the outQuery and outTotal counters. 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 Module SWI, Core Level, PCR 03966 Module Mlds Level, PCR Module BGP, IPG 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.