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Document VersionRelease DateDetails2April 04, 2023The Resolution section has been updated with the firmware version containing the solution.1May 18, 2022Original document release.For any HPE Synergy 12000 Frame containing one (or more) pair of Mellanox SH2200 Switch Module for HPE Synergy configured with Multi-Chassis Link Aggregation Group (MLAG), any restart of the FLM with the active redundancy role may result in a connectivity disruption between one (or more) compute modules in the frame and its associated production Mellanox fabric(s).Restarting the active FLM will occur when any of the following operations are performed:FLM firmware updateManually-requested FLM redundancy failoverManually-requested restart of the active FLMPhysical removal of the active FLMFLM factory resetThe active FLM performs discovery of all of the components within the frame each time there is a reset of the active FLM. As part of this discovery process, the FLM performs a check to verify the compatibility of interconnect modules connected via the internal midplane crosslink connection. The disruption of production network connectivity described above occurs due to a flaw in this compatibility check which causes the FLM to briefly disable the crosslink connection between the Mellanox SH2200 Switch Modules.When this issue occurs, connectivity is typically disrupted for 60 seconds (or less); however, may not recover automatically depending on factors such as the specific deployed fabric types, fabric redundancy configuration, Operating System/driver/application configuration, and resilience of the fabric technology. Note that this issue only impacts Mellanox SH2200 Switch Modules where MLAG has been configured.
In the scenario described above, the following:Any HPE Synergy Frame Link Module running firmware versions prior to 4.00.00.Any Mellanox SH2200 Switch Module for HPE Synergy running any firmware version and configured with Multi-Chassis Link Aggregation Group (MLAG).
To avoid this issue, install FLM firmware version 4.00.00 (or later). This version has been included in HPE Synergy Service Pack (SSP) 2023.03.01. For any upcoming versions and additional information, refer to the following link:HPE Synergy Software ReleasesAs a workaround, if the configuration matches the Scope section above, schedule a maintenance window before performing any of the following operations:FLM firmware updateManually-requested FLM redundancy failoverManually-requested restart of the active FLMPhysical removal of the active FLMFLM factory resetTo determine if the Mellanox SH2200 Switch Module MLAG connectivity was restored, run the "show mlag" and "show mlag statistics" commands, as shown below.Perform either of the following steps to connect to the switch:SSH into the switch directly using the mgmt0 IP address.ORi. SSH into the composer IP address and log in as Administrator. This will log into the main-view.ii. Type "console-view" to enter the console.iii. List available interconnect modules using command "show interconnect list".iv. Select the affected Mellanox SH2200 Switch Module and run command: connect interconnect <enclosure name> <bay number>switch-xxx [MlagDomain1: master] #show mlag statisticsIPL 1:RX Heartbeat : 449TX Heartbeat : 449Mgmt RX Heartbeat : 449Mgmt TX Heartbeat : 449RX IGMP tunnel : 0TX IGMP tunnel : 8RX XSTP tunnel : 203TX XSTP tunnel : 9RX ARP tunnel : 19TX ARP tunnel : 34RX mlag-notification : 0TX mlag-notification : 0RX port-notification : 2TX port-notification : 2RX FDB sync : 269TX FDB sync : 269RX LACP manager : 1TX LACP manager : 1Heartbeat TX errors : 0Heartbeat RX miss : 0Heartbeat remote defect : 0Heartbeat local defect : 0Mgmt Heartbeat TX errors : 0Mgmt Heartbeat RX miss : 0Mgmt Heartbeat remote defect: 0Mgmt Heartbeat local defect : 0Additionally, check the status of the ports used to create the Inter Peer Link (IPL), which typically are Eth1/21 and Eth1/22. The following is an example (some output was omitted):switch-xxx [MlagDomain1: master] #show int status | i 1/2...Eth1/21(Po1) UpEnabled 100G 9216 -Eth1/22(Po1) UpEnabled 100G 9216 -If the Mellanox SH2200 Switch Module MLAG connectivity is down, reboot the affected switch.Note:For most instances, either the MLAG connectivity will recover automatically, or rebooting the affected switch will restore MLAG connectivity.RECEIVE PROACTIVE UPDATES: Receive support alerts (such as Customer Advisories), as well as updates on drivers, software, firmware, and customer replaceable components, proactively in your e-mail through HPE Support Alerts. Sign up for Support Alerts at the following URL:HPE Email Preference CenterNAVIGATION TIP:For hints on navigating HPE.com to locate the latest drivers, patches and other support software downloads, refer to theNavigation Tips document.SEARCH TIP:For hints on locating similar documents on HPE.com, refer to theSearch Tips document.
Operating Systems Affected:Not Applicable
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