Reg MAC Address for VIP

Hi,

Could you please let me know where can we find the MAC address of a VIP as i did a PCAP and found one of the Self IP 10.138.64.7 ( Floating Self IP 10.138.64.9) sent an ARP broadcast to know the MAC address of the VIP.

The above Self IP network is used by F5 to forward the traffic to the backend pool members and also could you please help me understand why the Self IP did an ARP request for the MAC address of the VIP.

ltm virtual xyz.com {

destination 10.138.66.135:https    

ip-protocol tcp

mask 255.255.255.255

partition Production

pool xyz.com--pool

profiles {
    /Common/http { }
    /Common/tcp { }
    xyx.com-ssl {
        context clientside
    }
}

source 0.0.0.0/0
source-address-translation {
    type automap
}


}

ltm pool xyz.com--pool{

`members {
    xyz.com:tproxy {
        address 10.138.66.63
        monitor /Common/tcp
        session monitor-enabled
        state up
    }
}
monitor /Common/gateway_icmp and /Common/tcp
partition test    


}

Thanks,
Yugandhar.