Switching

We have an issue with multicast on a  pair of EX8208 switches running JUNOS 10.4r1.9.

The issue appears to be that JunOS is not allowing the mutlicast MAC address 03:xx:xx:xx:xx to flood across the switch.

we have disabled IGMP snooping.

looking at methods of configuring on a cisco i came across the following

<snip>

1. STATIC ARP RESOLUTION Cisco Global command mode
   
   For example:
   
   arp [ip] [cluster multicast mac] ARPA
   arp 192.168.1.100 03bf.c0a8.0164 ARPA
   
   
2. STATIC MAC RESOLUTION Cisco Global command mode
   
   For example:
   
   mac-address-table static [cluster multicast mac] [vlan id] [interface]
   mac-address-table static 03bf.c0a8.0164 vlan 1 interface GigabitEthernet1/1 GigabitEthernet1/2
   GigabitEthernet1/15 GigabitEthernet1/16
3. </snip>

this allows the multicast mac to be sent down these interfaces.

I can't find a way to apply this in JunOS though.

Any help would be apprciated!  Let me know if you need further information - It's my first time posting.

Hi,

vlan {

        unit 1 {

             family inet {

                address 10.1.0.2/25 {

                    arp 10.1.0.75 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.76 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.77 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.78 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.79 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.80 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.90 multicast-mac 03:bf:0a:01:00:4b publish;

                    arp 10.1.0.91 multicast-mac 03:bf:0a:01:00:4b publish;

AFAIK with 11.1 we flood 03:xx MACs so you would not need this static entry.

Kind Regards

Michael Pergament

If this worked for you please flag my post as an "Accepted Solution" so others can benefit. A kudo would be cool if you think I earned it.

Hi Mike,

my description of my situation was not quite detailed enough.

we were having issues with the multicast on the EX8208's, but they were only functioning at L2.

The static ARP entries were entered on external Cisco routers, so I needed to understand how to get the mcast to flood.

Your description below talks about adding @ L3.  I will need to do this @ some point in the future when we dump the Cisco, but not just yet :0)

strangely, we did get it working in the end, but we had to add an IP address to the VLAN before it would kick in and start flooding the mcast MACs.   Any ideas why this would be the case?

Thanks for your prompt assistance, it led us in the right direction and we got there in the end.

Hi,

do you have IGMP snooping enabled for this VLAN on EX? If yes then it would explain why 03:xx MACs are not flooded. I cannot explain how adding IP address on EX would result in 03:xx to be flooded...

Kind Regards

Michael Pergament

Hi!

Did you sort it out?

Maybe another hint: If IGMP-Snooping is enabled, you might need to declare the port(s) thru which the Muklticast-Member(s) is / are reachable as multicast-router interface:

root@ex3200-HdKuD# show | compare
[edit protocols igmp-snooping]
     vlan all { ... }
+    vlan default {
+        interface ge-0/0/2.0 {
+            multicast-router-interface;
+        }
+    }

HTH,

Kai

hi ,

try to enable igmp v2 on that vlan :

protocols {
    igmp {
        traceoptions {
            file igmp-log;
            flag all;
            flag packets;
        }
        interface vlan.XXX {
            version 2;

igmp-snooping {
        vlan XXX

this should work with you