HP Virtual Connect 8Gb 20-port Fibre Channel Module for c-Class BladeSystem - Manual (Page 83)

Virtual Connect networks 83
CAUTION: After Expanded VLAN Capacity mode is configured, you must delete the VC domain
to return to Legacy VLAN Capacity mode.
IMPORTANT: Expanded VLAN Capacity mode is not supported on the following VC Ethernet
modules:
• HP 1/10Gb VC-Enet Module
• HP 1/10Gb-F VC-Enet Module
If these modules are inserted into an enclosure that is in Expanded VLAN Capacity mode, they are
marked as incompatible.
Multiple Networks Link Speed Settings
When using mapped VLAN tags (multiple networks over a single link), these settings are used for the overall
link speed control. Select the checkbox next to each item to set the value.
These settings affect only newly created profiles.
To change these settings:
1. Click the selection box, and then select a setting (100Mb to 10Gb):
o Set preferred connection speed. This value is the default speed for server profile connections
mapped to this network. The server administrator can override this setting on an individual profile
connection.
o Set maximum connection speed. This value is the maximum speed for server profile connections
mapped to this network.
2. Click Apply.
Virtual Connect can only control link speed for Flex-10 NICs when they are connected to an HP Virtual
Connect Flex-10 Module. Virtual Connect cannot control the link speed of traditional NICs. For more
information, see "Flex-10 overview (on page 119 )."
IMPORTANT: Each FlexNIC and FlexHBA is recognized by the server as a PCIe physical function
device with adjustable speeds from 100Mb to 10Gb in 100Mb increments when connected to an
NC553i/m 10Gb 2-port FlexFabric Converged Network Adapter or any Flex-10 NIC. For
NC551i/m Dual Port FlexFabric 10Gb Converged Network Adapters, the range is limited to
1Gb to 10Gb in 100Mb increments.
MAC Cache Failover
When a VC-Enet uplink 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. Enabling Fast MAC Cache Failover causes 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 (5 seconds recommended) and completes in about 1 minute.
IMPORTANT: Be sure to set switches to allow MAC addresses to move from one port to another
without waiting for an expiration period or causing a lock out.