I am putting in a MX84 to replace a MPLS circuit with a site to site VPN. The new internet won't be installed until Friday. I configuted the MX84 and tested the site to site VPN prior to installing it at the client site.
At the client site, there is a MS250 connected to a Cisco router. Today I installed the MX84 between the router and the MS250. So now the Cisco router is connected to port 4 of the MX84, and the uplink port of the switch is connected to port 3 of the MX84.
With that configuration, traffic for phones and data worked for 90 minutes. Then data stopped. 30 minutes later the phones stopped working.
Rebooting of the MX84 and MS250 did not solve the issue. The only thing I can think of is that the MX84 does not like running with it's WAN port disconnected.
I will need to leave the phones running over the MPLS circuit for awhile after the site to site is up. So I will need this configuration working.