AE interface apply the shaping rate behavior is described in the KB31497 [juniper.net], does the behavior is same on the SRX RETH LAG ?
Build a LAB and test the shaping-rate feature on the RETH LAG interface, the shaping-rate bandwidth will not be divided by the number of RETH LAG interface.
root@test# run show version
node0:
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Hostname: test
Model: srx4100
Junos: 22.1R3.9
set chassis cluster reth-count 10
set chassis cluster redundancy-group 0 node 0 priority 200
set chassis cluster redundancy-group 0 node 1 priority 100
set chassis cluster redundancy-group 1 node 0 priority 200
set chassis cluster redundancy-group 1 node 1 priority 100
set security policies default-policy permit-all
set security zones security-zone trust interfaces reth0.0 host-inbound-traffic system-services all
set security zones security-zone trust interfaces reth0.0 host-inbound-traffic protocols all
set security zones security-zone untrust interfaces reth1.0 host-inbound-traffic system-services all
set security zones security-zone untrust interfaces reth1.0 host-inbound-traffic protocols all
set interfaces xe-0/0/0 gigether-options redundant-parent reth0
set interfaces xe-0/0/1 gigether-options redundant-parent reth1
set interfaces xe-0/0/2 gigether-options redundant-parent reth1
set interfaces xe-7/0/0 gigether-options redundant-parent reth0
set interfaces xe-7/0/1 gigether-options redundant-parent reth1
set interfaces xe-7/0/2 gigether-options redundant-parent reth1
set interfaces reth0 redundant-ether-options redundancy-group 1
set interfaces reth0 unit 0 family inet address 192.168.1.1/24
set interfaces reth1 per-unit-scheduler
set interfaces reth1 redundant-ether-options redundancy-group 1
set interfaces reth1 redundant-ether-options minimum-links 1
set interfaces reth1 redundant-ether-options lacp passive
set interfaces reth1 redundant-ether-options lacp periodic slow
set interfaces reth1 unit 0 family inet filter output test
set interfaces reth1 unit 0 family inet address 172.16.1.1/24
set class-of-service forwarding-classes queue 0 best-effort
set class-of-service forwarding-classes queue 4 test_1m
set class-of-service interfaces reth1 unit 0 scheduler-map cos-map
set class-of-service interfaces reth1 unit 0 shaping-rate 2g
set class-of-service scheduler-maps cos-map forwarding-class best-effort scheduler be-scheduler
set class-of-service scheduler-maps cos-map forwarding-class test_10m scheduler band_1m
set class-of-service schedulers band_1m shaping-rate 1m
set class-of-service schedulers band_1m priority high
set class-of-service schedulers be-scheduler transmit-rate remainder
set class-of-service schedulers be-scheduler buffer-size remainder
set class-of-service schedulers be-scheduler priority high
set firewall family inet filter test term 1 from source-address 192.168.1.2/32
set firewall family inet filter test term 1 from destination-address 172.16.1.2/32
set firewall family inet filter test term 1 then forwarding-class test_1m
set firewall family inet filter test term 1 then accept
set firewall family inet filter test term default then forwarding-class best-effort
set firewall family inet filter test term default then accept