HP Onboard Administrator - Manual (Page 28)

HP BladeSystem c7000 Enclosure hardware installation 28
Item Connector Description
4 OA2/iLO Reserved for future Onboard Administrator connections.
If the Onboard Administrator management Ethernet port is connected to a management LAN that also
connects to server ports, be sure that the server applications do not overload the Onboard Administrator
management port with broadcast packets. The Onboard Administrator management port forwards all
broadcast packets from the management network to all the devices inside the enclosure, and the Onboard
Administrator records network packet flooding messages to the active Onboard Administrator syslog when
it detects a high rate of packets. If the server connections are 1GB, and the Onboard Administrator
connection is 100 MB, the server broadcast packets can easily overwhelm the port on the network switch
connected to the Onboard Administrator. If the network packet flooding persists, the Onboard Administrator
performance is impacted with a possibility of Onboard Administrator restart if the packet flooding
overwhelms the Onboard Administrator capacity. This condition occurs is because Onboard Administrator
must inspect all packets from the network it is connected to so the Onboard Administrator can act as the
management conduit for internal enclosure devices, such as iLOs or Virtual Connect management interfaces.
While an Onboard Administrator restart does not cause direct customer traffic outage, this action can cause
unnecessary inconvenience, especially in configurations with Virtual Connect.
If the Onboard Administrator is connected to a network with a DHCP server when you power up the
enclosure, the Onboard Administrator and each iLO (one for each server blade) consumes a DHCP lease.