HP 1.10GB Virtual Connect Ethernet Module for c-Class BladeSystem - Manual (Page 73)

Network management 73
o No server profile connections are assigned to multiple networks not linked to a Shared Uplink Set.
This action forces all server connections mapped to multiple networks to be linked to a shared uplink set.
Server administrators cannot override this selection when creating or editing a profile.
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. Changing these settings does not affect any assigned
profiles.
To set the speed, click the selection box, select a setting (100Mb to 10Gb), and then click OK.
• Set a Custom value for the Preferred Link 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.
• Set a Custom value for the Maximum Link Connection Speed.
This value is the maximum speed for server profile connections mapped to this network. The server
administrator can override this setting on an individual profile connection.
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 additional
information, see "Flex-10 overview (on page
98 )."
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.
IGMP Snooping
The IGMP Snooping feature allows VC-Enet modules to monitor (snoop) the IGMP IP multicast membership
activities and configure hardware Layer 2 switching behavior of multicast traffic to optimize network
resource usage. Currently only IGMP v1 and v2 (RFC2236) are supported.