11-04-2010 01:18 AM
Hi all,
at the moment we have trouble with the following SRW208 setup:
- Port mirroring is enabled (Port 8 mirrors Port 1) for sniffing via Wireshark in promiscuous mode.
- 'IGMP Snooping' is enabled for all ports.
Our test scenario:
- an IPTV settop-box is connected to port 1 and gets/sends traffic from/to a VDSL router connected to port 2.
- a wireshark PC sniffs at mirror port 8 (all traffic) in promiscuous mode
- another wireshark PC sniffs at port 3 (all traffic) in promiscuous mode
With IGMP snooping enabled only the wireshark PC at (mirroring) port 8 should be able to sniff the mcast traffic between the settop-box and the VDSL router.
The problem is that wireshark can sniff the mcast traffic at all ports. In addition the LED of all active ports are blinking synchronously/continuously.
It seems that the IGMP snooping does not to work properly because all ports are still flooded with mcast traffic.
With an old Zyxel switch the same setup works without a problem.
Is this a known problem of the srw208?
Cheers,
Fred
11-04-2010 06:46 AM
Fred,
I have the same issue with our SRW2008. I have it hooked up to a Spirent TestCenter in the following diagram:
When I run the RFC3918 multicast test, Spirent ports 4, 5 and 6 send group registration requests and
are seen by Spirent port 3 (means they have made it through the switch). The multicast traffic then generated
from Spirent port 3 is seen on all Spirent ports 4-8, when it should only be seen on ports 4-6. I have
snooping configured and have tried it and without VLANs, changing the Ports from Access to Trunk but I
always seem to see the multicast packets spewing from ports 7&8 when they should not.
Have you hand any luck with technical support?
Thanks,
John C.
11-04-2010 07:01 AM
So much for the image upload, how about this diagram:
___________
Spirent 3 --------------| SRW2008 |------------------ Spirent 4
| |------------------ Spirent 5
| |------------------ Spirent 6
| |------------------ Spirent 7
| |------------------ Spirent 8
---------------------
11-05-2010 06:43 AM
In order for snooping to work, the Enable Bridge Multicast Filtering must be set (under Bridge Multicast
tab.) But the port selections on this menu only allow to select None, Forbidden and Static (Dynamic is
not selectable.) Forbidden and None are for excluding multicast packets, so that only leaves Static which
is not what is needed. I'm currently waiting for Tech support to to duplicate the issue and tell me why I can't
select Dynamic.
Thanks,
John C.
12-16-2010 07:36 AM
Hi John,
did you get an answer from Cisco in the meantime?
Regards,
Fred
11-08-2010 01:03 PM
Hi John,
didn't get an answer or technical support so far which is a little bit disappointing.
Hope you will have more luck with your request...
Cheers,
Fred
12-17-2010 05:42 AM
What setting do you have the bridge multicast and the bridge multicast forward all?
If those settings are setup on the port then it will flood the unregistered multicast on that port.
12-17-2010 08:00 AM
See my post on November 5th. The Bridge Multicast tab needs to have the port "Dynamic" be settable. It is not and technical support said they would see why this is not being allowed, but they never got back to me.
John C.
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