srx防火墙在配置pppoe拨号时可以增加auto-reconnect配置进行断线重连
set interfaces pp0 unit 0 pppoe-options auto-reconnect 10
同时也可以通过event-options监测pppoe接口，发现接口down后自动重连
set system syslog file syslog-event-daemon-warning-id404 any any
set system syslog file syslog-event-daemon-warning-id404 match "SNMPTRAPLINKDOWN|SNMPTRAPLINKUP|ifOperStatus"
set event-options policy reconnect-pppoe-id404 events snmptraplinkdown
set event-options policy reconnect-pppoe-id404 attributes-match snmptraplinkdown.interface-name matches pp0.0
set event-options policy reconnect-pppoe-id404 then execute-commands commands "request pppoe connect pp0.0"