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

[Alex Arseniev]

You could do cascaded PM. In a nutshell:
1/ port-mirror original packet, send the original packet on its way
2/ send the COPY into a loop (cable loop or looped tunnel)
3/ take the looped COPY and mirror it once again, creating 2nd copy.
4/ send 1st copy and 2nd copy on their respective ways.
HTH
Rgds
Alex

----- Original Message ----- 
From: "Paul Vlaar" <p...@vlaar.net>
To: <juniper-nsp@puck.nether.net>
Sent: Thursday, October 18, 2012 11:45 PM
Subject: [j-nsp] port mirror to multiple ports on MX80 in inet6


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
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