content_image/1000113.jpg
The Management Console also provides the functions for remote call-home and remote support connectivity. 

For more information about the HMC, see Chapter 8, “IBM DS8900F Management Console planning and setup” on page 203. 

## 2.7.1 Ethernet switches 

The DS8900F base frame has two 8-port Ethernet switches in the Management Enclosure (ME). The two switches provide two redundant private management networks. Each central processor complex (CPC) flexible service processor (FSP) and each CPC logical partition (LPAR) network is connected to both switches. Each of these components, FSP and LPAR is using their own designated interface for the black and another one for the gray network. These components are connected to the external breakout ports of the ME. 

Each HMC is also using two designated ethernet interfaces for the internal black (eth0) and gray (eth3) networks. As the HMCs are installed in the ME they are already connected internally to the switches without routing them to outside connections of the ME. 

Each CPC includes connections to each switch to allow each server to access both private networks. These networks cannot be accessed externally, and no external connections are allowed. External client network connection to the DS8900F system is through dedicated connection to the Management Consoles. 

The switches receive power from the PSUs inside the ME and do not require separate power outlets. The ports on these switches are shown in Figure 2-31. 

<img src='content_image/1000113.jpg'>

The DS8950F has two 24-port switches (one for the grey and one for the black private network) at the bottom of the base frame if an expansion frame is connected to the base frame. These switches connect to the iPDUs in the expansion frame and the switches in the Management Enclosure. 

