Scenario 1:7 – Private Networks (Simple vNet) 91
Configuring Fast MAC Cache Failover
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When an uplink on a VC Ethernet Module that was previously in standby mode becomes active, it
can take several minutes for external Ethernet switches to recognize that the c-Class server blades
can now be reached on this newly active connection.
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Enabling Fast MAC Cache Failover forces Virtual Connect to transmit Ethernet packets on newly
active links, which enables the external Ethernet switches to identify the new connection (and update
their MAC caches appropriately). This transmission sequence repeats a few times at the MAC refresh
interval (five seconds is the recommended interval) and completes in about one minute.
Configuring the VC Module (Ethernet settings)
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Private Networks is supported on both Tunnel VLAN tags AND Map VLAN tags, so either setting
could be used here
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On the Virtual Connect Manager screen, Left pane, click Ethernet Settings, Advanced Settings
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Select either Tunnel or Map VLAN Tags
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Select Fast MAC Cache Fail-over with a refresh of 5
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Select Apply
Figure 1-81
Ethernet Settings.