Link Aggregation Group Control Transfer During Primary Node Reboot
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Solution Overview
Problem
Information handling systems experience network downtime and service interruptions during reboots, particularly when primary nodes reboot without prior notification, leading to disputes over control and circulation of stale root information in networks with loop topologies.
Innovation Solution
A primary information handling system notifies a secondary node of a pending reboot, allowing it to assume control of connections and instruct client systems to discard old root information, thereby minimizing downtime and avoiding disputes by designating itself as the STP root bridge.
Engineering Contradictions & Design Principles
Engineering Contradiction Analysis
1Reliability
If the primary node reboots without prior notification, then the system can apply updates or resolve errors through reboot, but network downtime and service interruptions occur
Solution Approach 1:
The primary node sends a notification message to the secondary node before rebooting, allowing the secondary node to prepare and assume control of link aggregation groups in advance. This preliminary action ensures that network control is already transferred when the primary node reboots, eliminating service interruptions and downtime while still allowing the primary node to apply updates or resolve errors through the necessary reboot.
2Speed
If the primary node reboots suddenly, then the reboot can be performed quickly, but disputes over control and circulation of stale root information occur in networks with loop topologies
Solution Approach 1:
Before the primary node reboots, it sends a notification to the secondary node which then assumes control of the link aggregation groups. Additionally, the primary node instructs client information handling systems to discard their stored root information. This preliminary discarding of root information prevents the circulation of stale root data in the network, while the rapid reboot can proceed without causing control disputes.
3Reliability
If the secondary node assumes control immediately upon notification, then network continuity is maintained, but control transfer disputes may occur without proper coordination
Solution Approach 1:
The primary node sends a notification message to the secondary node before rebooting, providing feedback that triggers the control transfer process. The secondary node, upon receiving this notification, assumes control of the link aggregation groups. This feedback mechanism ensures coordinated control transfer, maintaining network continuity while preventing disputes through proper communication and synchronization between nodes.
Data Source
AI summary
A first information handling system may detect a reboot condition for the first information handling system. The first information handling system may transmit a first notification to a second information handling system, notifying the second information handling system that the first information handling system is going to reboot. The first information handling system may transmit a second notification to a third information handling system, instructing the third information handling system to age out old root information. The first information handling system may then reboot.