catalog node and catalog db @ db2

CATALOG [ADMIN] TCPIP NODE node-name REMOTE hostname [SERVER service-name]
db2 => catalog tcpip node rhbdemo remote 192.168.1.23 server 50000

db2 => list node directory

CATALOG DATABASE database-name [AS alias] [ON drive | AT NODE node-name]
db2 => catalog database ibsdb as rhbdb at node rhbdemo