The easiest way to search for a customer is to use their IP.
Then use:
show subscribers | match %PUBLICIP%
To watch the current traffic flow for a customer you would type:
monitor interface demux0.00000000000
You will get the demux from the show subscribers command. This will show the current traffic going through the ONT/modem. Only customers with a public IP address will be accessible from the Juniper.
To check details for a user if you have the demux use:
show subscriber interface demux0.0000000000 extensive
The MAC listed here is the device plugged into the Internet provisioned port on the modem or ONT. It will also show what speed the port is configured for under IPv4 Input Filter Name.
They can be 100M-Dynamic, 50M-Dynamic, 20M-Dynamic, or 10M-Dynamic.
If you cannot find the customer’s demux, get the customer to read off the mac address on their router and type the following command:
show subscribers mac-address (mac address w/ colons aa:11:bb…)
This is a reverse search, and will bring up all demux interfaces with that mac address.