It's not exactly a hub, it's a dumb switch.
Without the switch, the link is DOWN. Everything was UP before the upgrade.
The interface configuration is:
ge-1/0/3 {
enable;
speed 100m;
mtu 9192;
link-mode full-duplex;
unit 0 {
family inet {
address X.X.X.X/30 {
broadcast X.X.X.X;
}
}
}
}
Thanks!