[j-nsp] port mirror to multiple ports on MX80 in inet6

[Paul Vlaar]

Hi, I've currently successfully gotten port mirroring setup to more than
one port, using the following config:

port-mirroring {
    family inet {
        output {
            next-hop-group default-collect;
        }
    }

next-hop-group default-collect {
    group-type inet;
    interface ge-1/3/2.0 {
        next-hop 192.168.10.2;
    }
    interface ge-1/3/5.0 {
        next-hop 192.168.20.2;
    }
}

router> show configuration interfaces ge-1/3/2
unit 0 {
    family inet {
        address 192.168.10.1/30 {
            arp 192.168.10.2 mac 00:1b:21:86:a2:92;
        }
    }
    family inet6 {
        address fdb5:1281:f3cf:c7c4::1/64 {
            ndp fdb5:1281:f3cf:c7c4::2 mac 00:1b:21:86:a2:92;
        }
    }
}

router> show configuration interfaces ge-1/3/5
unit 0 {
    family inet {
        address 192.168.20.1/30 {
            arp 192.168.20.2 mac 00:1b:21:86:a3:9a;
        }
    }
    family inet6 {
        address fd3d:122a:8541:ecb5::1/64 {
            ndp fd3d:122a:8541:ecb5::2 mac 00:1b:21:86:a2:93;
        }
    }
}

This works very nicely, I see traffic at both measurement hosts. I would
like to do the same for IPv6, but there's no next-hop-group setting
available:

[edit forwarding-options port-mirroring family inet6 output]
router# set ?
Possible completions:
+ apply-groups         Groups from which to inherit configuration data
+ apply-groups-except  Don't inherit configuration data from these groups
> interface            Interfaces through which to send sampled traffic
  no-filter-check      Do not check for filters on port-mirroring interface
[edit forwarding-options port-mirroring family inet6 output]

This limitation is actually mentioned in the documentation, here:

http://www.juniper.net/techpubs/en_US/junos12.2/topics/usage-guidelines/services-configuring-port-mirroring.html

"Port mirroring supports up to 16 next hops, but there is no next-hop
group support for inet6."

However I was wondering perhaps someone knows if there's a trick to this
using filter based forwarding? I can't really figure out how from the
examples given.

This is an MX80 on JunOS 11.2R3.3

Thanks!

	~paul