We have the virtual-chassis of two EX4550 switches.
We have configured the analyzer feature, and it works over one year without any issue, but has stopped works unexpectly - traffic on the monitor port is tens of pps (packets per second) now insted two hundreds of kpps (kilo packets per second). It's hard to solve because this is production setup with critical services.
Version of junos is 12.3R7.7.
Details of configuration: one global analyzer with mirroring of two local port on both directions (ingress and egress) and some firewall filters with analyzer action. This ethernet family filters are binded to vlan (set vlans vlan0005 filter input FILTER-COPM-VLAN5). Counters of this firewall filter is incrementing every time, but we don't see this packets on monitor port.