For routers that include two Routing Engines, you can specify two special group names—re0 and re1. These two special group names apply to the Routing Engines in slots 0 and 1 of the TX Matrix platform. In addition, the routing matrix supports group names for the Routing Engines for each T640 routing node: lcc n-re0 and lcc n-re1. n identifies a T640 routing node from 0 through 3. For more information about configuration groups, see the JUNOS CLI User Guide.