Juniper fxp0 management interface


On a Juniper router the fxp0 interface does not show up in the “standard” interface configuration output. Instead, it is grouped with the router engines configuration.


Looking at the routing table, we see the network is associated with the fxp0.0 interface:

jemurray@LAB-MX480> show route

inet.0: 9 destinations, 10 routes (9 active, 0 holddown, 0 hidden)
+ = Active Route, - = Last Active, * = Both     *[Direct/0] 6d 23:01:48
                    >  via fxp0.0
                    [Direct/0] 6d 23:01:48
                    >  via fxp0.0

show interfaces details information about the fxp0.0 interface:

jemurray@LAB-MX480> show interfaces fxp0.0
  Logical interface fxp0.0 (Index 6) (SNMP ifIndex 13)
    Flags: Up SNMP-Traps 0x4004000 Encapsulation: ENET2
    Input packets : 577260
    Output packets: 47143
    Protocol inet, MTU: 1500
    Max nh cache: 75000, New hold nh limit: 75000, Curr nh cnt: 4, Curr new hold cnt: 0, NH drop cnt: 0
      Flags: Sendbcast-pkt-to-re, Is-Primary
      Addresses, Flags: Master-only Is-Default Is-Preferred Is-Primary
        Destination: 172.21.16/24, Local:, Broadcast:
        Destination: 172.21.16/24, Local:, Broadcast:

But where is the configuration?

jemurray@LAB-MX480> show configuration interfaces fxp0


The fxp0 interfaces are configured under the route engines:

jemurray@LAB-MX480> show configuration groups re0 interfaces fxp0
unit 0 {
    family inet {
        filter {
            input-list LAB_PROTECT_BOX;
        address {