How to check if a juniper ssg is in a cluster

This SSG is in a cluster

MYSSG-> get nsrp
nsrp version: 2.0
cluster info:
cluster id: 1, name: SSG_CLUSTER
local unit id: xxxxxxxx
active units discovered:
index: 0, unit id:   xxxxxxx, ctrl mac: xxxxxxxxxxxx , data mac: xxxxxxxxxxxx
index: 1, unit id:    xxxxxxx, ctrl mac: yyyyyyyyyyy , data mac: yyyyyyyyy
total number of units: 2

This SSG is not

OtherSSG-> get nsrp
nsrp version: 2.0
cluster info:
 cluster id not set: nsrp is inactive