Sun Microsystems Sun Fire 12K, Site Planning Manual

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Chapter 4 Network Planning 4-3
All external connections to the SC should be through the user community logical
interface L–Cx, so clients are always directed to the main SC.
4.3 Network Configurations
For the System Controller, there are two types of network configurations: high
availability (HA) and non HA. In either of the network configurations, the following
is true:
■
The domains can connect to any number of user communities. The limitation of
two is for the SC only.
■
The domains might or might not be cabled to the same user communities as the
System Controllers. This is driven by the security policy of the site.
■
The main SC and the spare SC must have identical network cabling.
■
For HA configurations, redundancy can be further increased within each user
community by deploying multiple switches or hubs.
■
If the SC loses all connections to any one user community, an SC failover (switch
over) is triggered (affecting all user communities attached to the SC).
■
Access to the platform itself is highly available. Outages due to a catastrophic
SC-centric failure are averted by failing over to the spare SC.
Note – The cPCI slot in the SC is not currently supported and is not available for
network connections.
Network configurations for the domains are not discussed and are left to the specific
requirements of the customer and application.