Policy based routing

The management network on the Cloud Pak for Data System system allows access to nodes 1-3 in chassis 1 for access in the event the application network is unreachable. The other purpose of the management network is for the system to contact all network services that it must reach, such as DNS, NTP, SMTP, LDAP. The system uses PBR (Policy Based Routing) and therefore is routable on the customer network.

Any connection coming in through the management interface will go back out the management interface. Additionally the PBR specifies that DNS, NTP, SMTP and LDAP communication will go out through this connection. The management network must be able to reach these services on your network as these services will not work through the application connection.

The system supports policy-based routing on the management network. This means the management network, although it is not the default route, is routable and will respond to traffic coming from other subnets to the management IPs. This also means the system will use the management network to reach out to the NTP, DNS and SMTP servers but only by protocol. This means you may not be able to ping a NTP, DNS or SMTP server from the management network but the protocol will still work as long as the customer network setup permits the traffic. A gateway IP for management is required to be able to reach the NTP, DNS and SMTP servers from the management network.