Below shows you how to configure basic NSRP cluster, prior to below you would of needed to configure your interfaces.

Node A

set nsrp rto-mirror sync
set nsrp monitor interface eth1
set nsrp monitor interface eth3
set nsrp cluster id 1
set nsrp vsd-group id 0 priority 100
save

Node B

set nsrp rto-mirror sync
set nsrp monitor interface eth1
set nsrp monitor interface eth3
set nsrp cluster id 1
set nsrp vsd-group id 0 priority 90
save
exec nsrp sync global-config save