Dear Friend,
I am little bit slow in Juniper config so am here for a solution ...
As per my view while failover testing happening POR CHANNEL 2 change to PORT CHANNEL 4 in switch side, but still traffic if sending to old interface because switch side interface is still UP, and due to ARP traffic is forwarding.
1. AS YOU TOLD - IF I ADD ALL SWITCH PORT TO LACP 2 this issue will be solved ??? ( Because after this there is only one LACP/ONE SUBNET, backup line also in same VLAN)
2.Firewall side configuration doesnt have any entry for LACP 4 (192.168.51.1) ???( Better I will change switch side config as stated in statement 1.)
Awaiting your valuable advice
Thanks