You are unable to create a new vector as described in documentation (https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/howto_config_snmp/ Step 7), If you add it under vectors with the add button, it won't save and if you type it in the service policy vector field it also won't save.

Inability to create a new vector in the conductor ui

1. Create the vector on the cli for each node:

   1. # config authority router <router name node 1> device-interface <interface> network-interface <network interface> management-vector name <vector name>

   2. # config authority router <router name node 2> device-interface <interface> network-interface <network interface> management-vector name <vector name>

2. Under the NIC Management Traffic Settings, type the name of the Management Vector Name manually
3. Validate/commit the changes, note that no config change will be detected by the validate process, but commit anyway.
4. Verify that you see the changes reflected in the web ui as well as the cli.

This seems to be a bug that has been reported found in 5.6.12.

https://www.juniper.net/documentation/us/en/software/session-smart-router/docs/howto_config_snmp/