@c-po I suspect that the problem has been found, but after I executed the restart PPPoE command, the default travel was lost. My configuration name wrote the following static route:

interface-route 0.0.0.0/0 {

next-hop-interface pppoe0 {
}

}
interface-route6 ::/0 {

next-hop-interface pppoe0 {
}

}
table 150 {

interface-route 0.0.0.0/0 {
    next-hop-interface pppoe0 {
    }
}
interface-route6 ::/0 {
    next-hop-interface pppoe0 {
    }
}

}

But it disappeared after disconnect interface pppoe0.

This problem may be mentioned by me in T2380.

When I restart PPPoE manually, I observe that the static route of IPv6 or IPv4 I set will be deleted, and then, after restarting PPPoE, its route will be lost (for regeneration).

Of course, there may be mistakes in my judgment. If so, I just feel like I want to describe my situation more clearly. If there are mistakes, please let me know.