Switching

Hi team,

We stumbled across a problem where igmp snooping was not on by default. And also it seems to me like there is no easy way to turn it on for all vlans like the ex4200's. Instead we have to enable for each individual vlan, becomes a pain when we have to do lots of vlans.

By default it seems like igmp-snooping is only enabled for the default vlan VLAN 1.

xxx@xxx> show igmp snooping statistics
Vlan: default
IGMP Message type      Received       Sent  Rx errors
Membership Query              0          0          0
V1 Membership Report          0          0          0
DVMRP                         0          0          0
PIM V1                        0          0          0
Cisco Trace                   0          0          0
V2 Membership Report          0          0          0
Group Leave                   0          0          0
Mtrace Response               0          0          0
Mtrace Request                0          0          0
Domain Wide Report            0          0          0
V3 Membership Report          0          0          0
Other Unknown types                                 0

IGMP Global Statistics
Bad Length                    0
Bad Checksum                  0
Bad Receive If                0
Rx non-local                  0
Timed out                     0

Further to this we had to configure " set multicast-snooping-options flood-groups 224.0.0.13 " to get PIM working, like wise same would be for HSRP or OSPF as examples.

Anyone come across this problem and had a solution or we doing things wrong?

Thank  you

Bilal

Not sure if my reply went through, so just in case posting here.  Could be a duplicate.

A quick Google search gives me:

http://www.juniper.net/techpubs/en_US/junos13.2/topics/example/igmp-snooping-ex-series-configuring.html

IGMP Snooping [reading between the lines] appears to be off by default on EX4300, which is different than EX4200.

With ELS (newer CLI applies to EX4300, but not EX4200) the something “all” commands do generally not work, at least with current versions of SW.  Therefore you must configure on a interface by interface or VLAN by VLAN basis, and not use the all knob.

As for your last question regarding configuration of a static multicast group, yes this is also required.  See this doc, this should help you:

http://www.juniper.net/techpubs/en_US/junos13.2/information-products/pathway-pages/ex-series/multicast-els.pdf

Good luck.

Hi rccpgm,

Thanks for the reply. It just seems so backwards, to have IGMP snooping off, and having to enable for each individual vlan, along with the multicast groups. Do you know if there was a specific reason for changing the default behaviour? What is Juniper's drive - what do they achieve with this?