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Multipath selection in an ethernet fabric in a modular network element

  • US 10,674,241 B2
  • Filed: 04/23/2018
  • Issued: 06/02/2020
  • Est. Priority Date: 04/23/2018
  • Status: Active Grant
First Claim
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1. A modular network element configured for Ethernet path selection, the modular network element comprising:

  • one or more ingress line modules;

    one or more switch modules in a chassis; and

    one or more egress line modules, wherein the one or more ingress line modules and the one or more egress line modules are located separate from the chassis and connected to the chassis via cabling,wherein one or more Ethernet flows are distributed from the one or more ingress line modules to the one or more egress line modules via the plurality of switch modules,wherein the one or more ingress line modules receive fabric state information from the chassis out-of-band via the cabling,wherein, responsive to congestion on a path through the plurality of switch modules, a new path is selected by an ingress line module for an Ethernet flow,wherein, prior to switching the Ethernet flow to the new path, a gap is created in the Ethernet flow through buffering such that the gap is no larger than a path delay difference between a current path and the new path, and wherein a size of the gap is set to a latency of the current path minus a latency of the new path plus a margin.

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