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US 11,456,969 B2Granted
Predictive handover of traffic in an aggregation network
AssigneeHewlett Packard Enterprise Development LP
InventorsSuganya John Bosco Sesu Annamary, Chandru Ds, Sivakumar Ramasamy
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Abstract
An MC-LAG system may operate to monitor load conditions existing in two network switches, and to compute a load index value based on detected load conditions. If a computed load index value for a first switch is determined to exceed a predetermined threshold, an overloaded switch may predictively cause traffic to be routed to a second switch prior to rebooting of the first switch. Load index values may be computed based upon factors including excessive inter-switch link (“ISL”) flapping, excessive MAC flush or MAC move operations in a switch, excessive processing resource utilization in a switch.
Claims20
A method of operating a multi-chassis link aggregation group (MC-LAG) system, comprising:
- forming the MC-LAG system by aggregating a first interface to a downstream device from a first switch with a second interface to the downstream device from a second switch, wherein an inter-switch link of the MC-LAG system couples the first switch and the second switch;
- synchronizing, with the second switch, network address information learned by the first switch via the inter-switch link during operation of the MC-LAG system;
- computing a load index value for the first switch as a function of at least one load parameter, wherein the at least one load parameter is variable during operation of the first switch and indicates load of the MC-LAG system at the first switch;
- and
- in response to the load index value exceeding a predetermined threshold value:
- sending, via the inter-switch link, a notification message to the second switch indicating re-routing of traffic from the downstream device to the MC-LAG system through the second switch;
- disabling the first interface for triggering the re-routing of traffic to the MC-LAG system;
- remediating a load condition impacting the load index value at the first switch, wherein the remediated load condition reduces the load index value below the predetermined threshold value;
- and
- re-enabling the first interface for resuming traffic from the downstream device to the MC-LAG system through the first and second switches.
7 more elements
A first switch participating in a multi-chassis link aggregation group (MC-LAG) system, comprising:
- a first interface coupled to a downstream device;
- a memory coupled to the processor and storing instructions, which when executed by the processor cause the processor to perform a method, the method comprising:
- forming the MC-LAG system by aggregating the first interface with a second interface on the second switch coupled to the downstream device, wherein an inter-switch link of the MC-LAG system couples the first switch and the second switch;
- synchronizing, with the second switch, network address information learned by the first switch via the inter-switch link during operation of the MC-LAG system;
- computing a load index value for the first switch as a function of at least one load parameter, wherein the at least one load parameter is variable during operation of the first switch and indicates load of the MC-LAG system at the first switch;
- and
- in response to the load index value exceeding a predetermined threshold value:
- sending, via the inter-switch link, a notification message to the second switch indicating re-routing of traffic from the downstream device to the MC-LAG system through the second switch;
- disabling the first interface for triggering the re-routing of traffic to the MC-LAG system;
- remediating a load condition impacting the load index value at the first switch, wherein the remediated load condition reduces the load index value below the predetermined threshold value;
- and
- re-enabling the first interface for resuming traffic from the downstream device to the MC-LAG system through the first and second switches.
9 more elements
A non-transitory computer-readable medium tangibly embodying instructions executable by a hardware processor to:
- form a multi-chassis link aggregation group (MC-LAG) system by aggregating a first interface to a downstream device from a first switch with a second interface to the downstream device from a second switch, wherein an inter-switch link of the MC-LAG system couples the first switch and the second switch;
- synchronize, with the second switch, layer 2 network address information learned by the first switch via the inter-switch link during operation of the MC-LAG system;
- compute a load index value for the first switch as a function of at least one load parameter, wherein the at least one load parameter is variable during operation of the first switch and indicates load of the MC-LAG system at the first switch;
- in response to the load index value exceeding a predetermined threshold:
- send, via the inter-switch link, a notification message to the second switch indicating re-routing of traffic from the downstream device to the MC-LAG system through the second switch;
- disable the first interface for triggering the re-routing of traffic to the MC-LAG system;
- remediate a load condition impacting the load index value at the first switch, wherein the remediated load condition reduces the load index value below the predetermined threshold value;
- and
- re-enable the first interface for resuming traffic from the downstream device to the MC-LAG system through the first and second switches.
6 more elements
Dependencies are inferred from the claim text.