Physically adding public network adapters to a node in a cluster is no different from adding public network adapters in a noncluster environment. For the procedure about how to add public network adapters, see the hardware documentation that shipped with your node and public network adapters.
Once the adapters are physically installed, Sun Cluster requires that they be configured in an IPMP group. For the procedure on configuring an IPMP group, see How to Configure Internet Protocol (IP) Network Multipathing Groups in Sun Cluster Software Installation Guide for Solaris OS.
To add a new public network adapter to an IP Network Multipathing group, see the IP Network Multipathing Administration Guide.