Multicast through Juniper SRX 5800

We’ve been working toward a more simplified model for our network path, and in doing so, we desired a congruent path for IPv6, IPv4 Multicast and IPv4 Unicast.
However, this is actually pretty hard when dealing with the link speeds, amounts of traffic and flows that we do, in conjunction with Firewall…..and IDP/IPS…
Lots of research, reading and testing was done.
Juniper SRX series has full support for 90% of this, with IPv6 IDP coming in Q2 of 2011.

IPv4 Multicast is that unpleasant, poorly understood beast that most folks try to ignore. Nevertheless, we need it. So, we had to make this work through our SRX (in the past IPv4 multicast took a different path in/out of our network.

I’m going to glaze over the multicast bits on our Juniper MX routers, if you’re doing multicast already, this should already be working and Juniper has well documented and well implemented multicast capabilities.
On the SRX, luckily, it’s pretty similar.
[email protected]> show configuration protocols pim
rib-group inet multicast-rpf-rib;
rp {
static {
interface xe-1/1/0.0;
interface xe-2/1/0.0;
interface xe-10/1/0.0;
interface xe-13/1/0.0;

Make sure you are importing the routes into the tables by configuring your RIB groups
[email protected]> show configuration routing-options rib-groups
igp-rib {
import-rib [ inet.0 inet.2 ];
multicast-rpf-rib {
export-rib inet.2;
import-rib inet.2;
You’ll need to make sure that there is a firewall policy to permit your multicast to actually flow. For arguments sake, I’m assuming you have an outbound policy that is less than or equal to this in terms of policy allowed.

[email protected]> show configuration security policies from-zone Untrust to-zone Trust policy Multicast-permit
match {
source-address any;
destination-address multicast_224_0_0_0_4;
application junos-udp-any;
then {
log {

Thats pretty much it as far as the SRX goes (assuming I’m remembering correctly, it’s been a while since we did it and I don’t know multicast as well as I’d like). Using the cookbook from Internet2 one should be enough to get Multicast working with your SRX as long as you have your policy set to allow it.

[email protected]> show multicast statistics
Interface: xe-10/1/0.0
Routing protocol: PIM Mismatch error: 0
Mismatch: 8 Mismatch no route: 0
Kernel resolve: 287 Routing notify: 0
Resolve no route: 0 Resolve error: 0
Resolve filtered: 0 Notify filtered: 0
In kbytes: 4273 In packets: 45042
Out kbytes: 18014398509409554 Out packets: 18446744073709258616
Interface: xe-1/1/0.0
Routing protocol: PIM Mismatch error: 0
Mismatch: 11786 Mismatch no route: 3
Kernel resolve: 323210 Routing notify: 0
Resolve no route: 0 Resolve error: 0
Resolve filtered: 0 Notify filtered: 0
In kbytes: 100127811 In packets: 1164651571
Out kbytes: 10827919 Out packets: 80039321
[[ This is a content summary only. Visit my website for full links, other content, and more! ]]


  1. D.C. says:

    Question…was this enabled on the cluster? If so are you enabling PIM/IGMP on the reth interfaces or just on the physical ones?


  2. It is enabled on the cluster. We have no Reth interfaces, it’s all in active/active.

  3. Chris A. says:

    Thanks. I’am sure our professional services team can take this knowledge and apply it in the field.

© 2019 The Forwarding Plane. All rights reserved.

Copyright 2016 Nick Buraglio, ForwardingPlane, LLC

%d bloggers like this: