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A temporary loss of node traffic to switch interfaces may occur with HPE M-Series switches running NVIDIA Cumulus Linux. Switches in an MLAG pair that are rebooted may experience the forwarding of traffic across their individual links before the MLAG peerlink is ready, which leads to attached nodes not receiving traffic. This loss of connectivity could last as long as three (3) minutes.During this time, the primary switch in the MLAG pair identifies the rebooted switch peerlink interface as being up (online) and resumes forwarding uplink traffic; however, the peerlink of the rebooting switch is not yet ready, which causes the incoming traffic to be lost.
This advisory applies to the following HPE M-Series Cumulus switches in an MLAG configuration:S2T75A - HPE SN2010M 25GbE 18SFP28 4QSFP28 Power to Connector Airflow Half Width Switch SN2010M with NVIDIA CumulusS2T76A - HPE SN2100M 100GbE 16QSFP28 Power to Connector Airflow Half Width Switch SN2100M with NVIDIA CumulusS2T77A - HPE SN3420M 25GbE 48SFP28 12QSFP28 Power to Connector Airflow Switch SN3420M with NVIDIA CumulusS2T78A - HPE SN3700cM 100GbE 32QSFP28 Power to Connector Airflow Switch SN3700cM with NVIDIA CumulusS2T80A - HPE SN4600cM 100GbE 64QSFP28 Power to Connector Airflow Switch SN4600cM with NVIDIA CumulusS2T79A - HPE SN3700M 200GbE 32QSFP56 Power to Connector Airflow Switch SN3700M with NVIDIA CumulusS2T81A - HPE SN4700M 400GbE 32QSFPDD Power to Connector Airflow Switch SN4700M with NVIDIA Cumulus
Choose any of the following options to resolve this issue:Reduce the mlag-init-delay to the lowest possible value as follows:nv setmlag init-delay 1nv config applyChange the VMware vSwitch failback from "true" to "false":esxcli network vswitch standard policy failover set --failback=false-v vSwitch0Put all the uplink interfaces (on both switches) into an MLAG port channel and turn on "lacp bypass":nv set interface bond9 bondlacp-bypassoffnv config applyContact HPE Support for a script that can be placed into one or both switches.Revision HistoryDocument VersionRelease DateDetails2February 27, 2026Updated all content in the Description section for clarity1February 17, 2026Original Document Release
Operating Systems Affected:Not Applicable
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