![]() ![]() Verifying Configuration CompatibilityĮntering an EOS reload command while MLAG is active generates warning messages if conditions that can result in packet loss during the upgrade are present. MLAG ISSU (In-Service Software Upgrade) upgrades EOS software on one MLAG peer with minimal traffic disruptions on active MLAG interfaces and without changing the network topology. Sessions can be reestablished if permitted by the resulting topology. Sessions established through one interface of a dual attached device may fail if its path is disrupted by the STP reconvergence, possibly resulting in temporarily lost connectivity. Severing the physical connection (cable) that establishes the peer-link between MLAG peers may result in a split brain state where each peer independently enters spanning tree state to prevent topology loops. In those cases where network topology requires additional time to stabilize or where a shorter delay can be tolerated, the reload-delay period can be configured using the reload-delay mlag command.
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