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

Ben Dale bdale at comlinx.com.au
Tue Apr 28 20:21:11 EDT 2015

Hi Chuck,

On 29 Apr 2015, at 9:32 am, Chuck Anderson <cra at WPI.EDU> wrote:

> 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.

This is usually caused because there are no physical interfaces up in the bridge-domain.  

I notice you've got an aggregated-ethernet interface in there - if you have LACP enabled, but no LACP partner, the physical link will stay up, but the logical interface will go down, thus taking down your IRB as well.



More information about the juniper-nsp mailing list