Hi Antonio,
Can you please describe the exact topology here?
Which interfaces you're using, what they're connected to, and where is the RP?
One thing to be aware of with NXOS is that things
only show up in sh ip mroute if the client
protocol/process (eg IGMP in this case) has
reason to feed them there. sh ip mroute is
basically looking at the MRIB view of the world and nothing else.
WRT the ip igmp join-group command, it does two
things: one is it causes that interface to send
IGMP joins for that group out that interface as
if it were a host. The other is that, if the
router is PIM DR on that interface, it feeds the
*G & the OIF to the MRIB. It's only at that point
you'll see the entry in sh ip mroute. Otherwise,
you'll only see it in the IGMP group membership table, ie, sh ip igmp group.
My guess here is you're not DR on this interface,
so I assume there's another router on the segment
that IS the DR. If you check the mrouting there I
suspect you'll see the *G entry joined to the RPT
(driven by the IGMP joins sent on that segment
from the router w/the join-group command).
WRT the loopback "working", what you're seeing is
that this router is now the only means by which
to reach that 'network segment' (ie, it's
obviously going to be DR on its own loopback) so
it will report the *G & OIF to the MRIB and then
you'll see the entry in sh ip mroute.
Hope that helps,
Tim
At 03:24 AM 10/1/2011, Antonio Soares contended:
This is lab environment, I'm just testing basic multicast features with
nexus.
The command reference says the following:
"When you enter this command, the traffic generated is handled by the device
CPU, not the hardware."
<http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/multicast/c>http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/multicast/c
ommand/reference/mcr_cmds_i.html#wp1230243
The "ip igmp static-group" was replaced by the command:
ip igmp static-oif
<http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/multicast/c>http://www.cisco.com/en/US/docs/switches/datacenter/sw/5_x/nx-os/multicast/c
ommand/reference/mcr_cmds_i.html#wp1034808
When I have the igmp joing on the physical interface, the (*,G) entry is
created then it disappears. But I see the (*,G) entry on the RP and I
verified that the traffic is actually sent to the nexus.
Thanks.
Regards,
Antonio Soares, CCIE #18473 (R&S/SP)
[email protected]
<http://www.ccie18473.net>http://www.ccie18473.net
-----Original Message-----
From: [email protected]
[<mailto:[email protected]>mailto:[email protected]]
On Behalf Of Phil Mayers
Sent: sábado, 1 de Outubro de 2011 10:49
To: [email protected]
Subject: Re: [c-nsp] Nexus 7K - Multicast Question
On 10/01/2011 01:31 AM, Antonio Soares wrote:
> Hello group,
>
> Anyone knows why the "ip igmp join-group" does not work on a physical
> interface but it works fine on a loopback interface ?
"ip igmp join-group" is a CPU command; it makes the CPU join the group
and receive the packets. I imagine this might not work on a hardware
platform, with an interface which will be processed in hardware.
Are you sure you don't want "ip igmp static-group"?
What's your use case?
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Tim Stevenson, [email protected]
Routing & Switching CCIE #5561
Distinguished Technical Marketing Engineer, Cisco Nexus 7000
Cisco - http://www.cisco.com
IP Phone: 408-526-6759
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