[j-nsp] MX: Hardware-Down for an irb logical unit

[Chuck Anderson]

What would cause an irb logical interface unit to stay in
"Hardware-Down"?  I'm using identical configs on 4 different routers
(different IPs of course), and one of them won't come up.  There is at
least one physical interface in the BD that is up.  The irb physical
interface is up.  There are many other irb logical units that are up
and working fine, just this one unit that is down.

I'm using 13.3R4.6 on 3 MX960's and 1 MX240.  The one that won't come
up is on the MX240.

I already tried deactvating the config, commit, rollback, commit full.

Not working:

rtr4> show interfaces irb.1257
  Logical interface irb.1257 (Index 365) (SNMP ifIndex 782)
    Flags: Hardware-Down Up SNMP-Traps 0x4004000 Encapsulation: ENET2
    Bandwidth: 1000mbps
    Routing Instance: default-switch Bridging Domain: INF1257+1257
    Input packets : 0
    Output packets: 0
    Protocol inet, MTU: 1500
      Flags: Sendbcast-pkt-to-re, User-MTU, uRPF, uRPF-loose
      Addresses, Flags: Dest-route-down Is-Preferred Is-Primary
        Destination: 10.219.5/24, Local: 10.219.5.5, Broadcast: 10.219.5.255
    Protocol inet6, MTU: 9170
      Flags: Is-Primary
      Addresses, Flags: Dest-route-down Is-Preferred
        Destination: fe80::/64, Local: fe80::2e21:7204:e968:ff0
        INET6 Address Flags: Tentative
    Protocol multiservice, MTU: Unlimited

rtr4> show interfaces terse |match ae2\.1257 
xe-1/1/1.1257           up    up   aenet    --> ae2.1257
ae2.1257                up    up   bridge  

rtr4> show bridge domain INF1257

Routing instance        Bridge domain            VLAN ID     Interfaces
default-switch          INF1257                  1257     
                                                     ae2.1257

rtr4> show configuration bridge-domains INF1257
vlan-id 1257;
interface ae2.1257;
routing-interface irb.1257;


Compare to working:

rtr3> show interfaces irb.1257 
  Logical interface irb.1257 (Index 355) (SNMP ifIndex 1186)
    Flags: Up SNMP-Traps 0x4000 Encapsulation: ENET2
    Bandwidth: 1000mbps
    Routing Instance: default-switch Bridging Domain: INF1257+1257
    Input packets : 0
    Output packets: 4140
    Protocol inet, MTU: 1500
      Flags: Sendbcast-pkt-to-re, Is-Primary, User-MTU, uRPF, uRPF-loose
        Destination: 10.219.5/24, Local: 10.219.5.1, Broadcast: 10.219.5.255
      Addresses, Flags: Is-Default Is-Preferred Is-Primary
        Destination: 10.219.5/24, Local: 10.219.5.4, Broadcast: 10.219.5.255
    Protocol inet6, MTU: 9170
      Flags: Is-Primary
      Addresses, Flags: Is-Preferred
        Destination: fe80::/64, Local: fe80::8271:1f04:e979:27f0
    Protocol multiservice, MTU: 9170

rtr3> show interfaces terse |match ae2\.1257
xe-0/1/1.1257           up    up   aenet    --> ae2.1257
ae2.1257                up    up   bridge

rtr3> show bridge domain INF1257

Routing instance        Bridge domain            VLAN ID     Interfaces
default-switch          INF1257                  1257     
                                                     ae2.1257

rtr3> show configuration bridge-domains INF1257
vlan-id 1257;
interface ae2.1257;
routing-interface irb.1257;


Thanks for any ideas...