Sending Port-Mirrored Traffic from an M, MX or T Series Router to Multiple Export Interfaces by Using Next-Hop Groups
To send port-mirrored traffic to multiple flow servers or packet analyzers, you can use the next-hop-group statement. The router can make up to 16 copies of traffic per group and send the traffic to the next-hop group members you configure. A maximum of 30 groups can be configured on a router at any given time. The port-mirrored traffic can be sent to any interface, except aggregated SONET/SDH, aggregated Ethernet, loopback (lo0), or administrative (fxp0) interfaces. To configure multiple port mirroring with next-hop groups, include the next-hop-group statement at the [edit forwarding-options] hierarchy level.
You must port-mirror the initial traffic to a tunnel interface so that it can be filtered and duplicated. Also, you need configure only the interface names for point-to-point interfaces, but you must configure the interface names and a next hop for multipoint interfaces (such as Ethernet).
Next-hop groups are supported on M Series routers only, except the M120 router and the M320 router.