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Network Service Module

Hot Swapping

Hot swapping is the installation or removal of a component such as an NSM without powering down or restarting the switch or router.

NSMs can be hot swapped in and out of switches and routers that are running Software Version 2.3.1 or later. To find out which software version your switch or router is running, use the command:

show system

See the Network Service Module Installation and Safety Guide for instructions on how to hot swap your NSM.

Hot Swapping the AT-AR040 NSM with PICs

Caution You cannot hot swap PICs. Before installing or removing a PIC from a PIC bay in a switch or router, you must disconnect all power sources to the switch or router. To install or remove a PIC from an AT-AR040 NSM, you must first either physically remove the NSM from the switch or router using the hot swap method, or disconnect all power sources to the switch or router.

You can hot swap the AT-AR040 NSM with PICs installed in its PIC bays. There is no need to remove the PICs before hot swapping the NSM.

When an AT-AR040 NSM with PIC cards is hot swapped out, and an identical combination of AT-AR040 and PICs is hot swapped into the same bay, the software configurations for the PIC interfaces are preserved across the hot swap. In this case, software modules configured to the PIC interfaces transfer to the newly swapped in interfaces.

When an AT-AR040 NSM with PICs is hot swapped out and a different combination of AT-AR040 and PICs is hot swapped into the same bay, new interface instances are created for any new PIC types or PIC types that are in different bays, and the old interface instances are discarded. For any PIC in the combination that is replaced by a PIC of the same type, interface instances are preserved.

Behaviour of Hot Swapped Interfaces

When an NSM is hot swapped out, its interface instances become dormant. They stay dormant until either another interface of the same type is hot swapped into the bay, in which case they are reactivated, or an interface of a different type is hot swapped into the bay, in which case they are discarded.

Dormant interfaces are included in the show interface command output

(Figure 12 on page 21 and Figure 13 on page 21) and in the SNMP interfaces MIB, marked as swapped out. In other switch or router commands, however, the switch or router behaves as though dormant interfaces do not exist.

Instances of higher-level modules such as LAPD, Q931, ISDN call control, PPP, and IP do not become dormant when an interface becomes dormant. Instead they behave as if the interface has stopped communicating, for example, as if the cable has been unplugged.

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Allied Telesis AT-AR041, AT-AR042 manual Hot Swapping the AT-AR040 NSM with PICs, Behaviour of Hot Swapped Interfaces
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AT-AR040, AT-AR040-10, AT-AR048, AT-AR041-00, AT-AR041 specifications

Allied Telesis has established itself as a reputable brand in the networking solutions market, and its AT-AR Series routers further exemplify their commitment to providing robust networking technology. The AT-AR042, AT-AR041, AT-AR041-00, AT-AR048, and AT-AR040-10 models come packed with features designed to meet the diverse demands of modern networks.

The AT-AR042 is a versatile router designed for small to medium-sized enterprises, offering advanced routing capabilities along with integrated security features. It supports a range of protocols, ensuring seamless connectivity across different network types. One of its standout characteristics is its support for Virtual Private Networks (VPNs), facilitating secure remote access for employees.

The AT-AR041 and the AT-AR041-00 models are specifically crafted to deliver dependable performance in both wired and wireless environments. They offer high-speed connectivity and are equipped with Layer 3 routing features, which is essential for effective traffic management in more complex network setups. These models also incorporate essential security protocols, reducing the risk of unauthorized access and ensuring data integrity.

The AT-AR048 extends the range of capabilities further with its advanced features aimed at larger organizations. It offers comprehensive Quality of Service (QoS) functionality, enabling prioritized traffic management which is particularly important in VoIP and video conferencing applications. Its multiple WAN support allows for load balancing, ensuring consistent uptime and optimized network performance during peak usage times.

Lastly, the AT-AR040-10 rounds out the series by offering a cost-effective solution without skimping on the essential features expected of a high-performance router. It comes with an intuitive management interface that simplifies configuration and monitoring, making it a favorable choice for IT staff.

Collectively, these routers incorporate technologies such as IPv6 support, SNMP for network management, and firewall capabilities to provide a secure and efficient networking environment. Additionally, they uphold the industry standards necessary for interoperability with existing systems.

In conclusion, the Allied Telesis AT-AR Series offers a range of products catering to the varying needs of businesses. From small offices to larger enterprises, these routers provide the essential features and capabilities needed to ensure reliable connectivity, secure access, and efficient network management. Their combination of performance, scalability, and security makes them an attractive choice for organizations looking to enhance their networking infrastructure.
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