bandwidth limit in juniper srx

I have a problem when configuring a bandwidth limit. This script works but local traffic is also to the limit. How do you make the local traffic not limit?

admin@vSRX# show firewall policer L2M
if-exceeding {
bandwidth-limit 2m;
burst-size-limit 256k;
}
then discard;

[edit]
admin@vSRX# show firewall policer L4M
if-exceeding {
bandwidth-limit 4m;
burst-size-limit 1m;
}
then discard;

[edit]
admin@vSRX# show interfaces ge-0/0/1
unit 0 {
family inet {
policer {
input L2M;
output L4M;
}
address 10.20.30.1/24;
}
}

[edit]
admin@vSRX#