[j-nsp] Juniper EX, HP server NIC teaming

Dale Shaw dale.shaw+j-nsp at gmail.com
Wed Jan 13 18:59:52 EST 2010

Hi again all,

On Tue, Jan 12, 2010 at 11:30 AM, Dale Shaw <dale.shaw+j-nsp at gmail.com> wrote:
> I'm operating in a bit of an information vacuum here, but I'm trying
> to help out some colleagues with a server NIC teaming / EX switch
> problem.

Here's an update:

My colleagues revisited the problem last night and disabling IGMP
snooping has 'fixed' the problem.

My question is, why is the switch doing anything but flood non-IP L2
multicasts and why is this traffic subject to the rules of IGMP
snooping? :-)

(The NIC team member interfaces won't be sending IGMP joins -- it's
not IP multicast.)

The previously referenced PR (PR/492704) sounded promising -- does
anyone have any insight into how the fix for that has been/is being

If disabling IGMP snooping is indeed the 'best' fix, what does the
list consider the most elegant / least intrusive way of disabling it?
They disabled it for the whole VLAN ("set protocols igmp-snooping vlan
server disable") but I'm guessing this means IP multicast traffic will
be flooded to all stations in the VLAN whether they're interested in
the traffic, or not.

The second link (PDF) below seems to indicate IGMP snooping can be
disabled explicitly on individual interfaces like so:

protocols {
  igmp {
    interface interface-name;

Other useful references:


More information about the juniper-nsp mailing list