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Multicast flood although IGMP enabled

 
Rainer Mittenzwey_2
Regular Advisor

Multicast flood although IGMP enabled

Hi,

 

in a dependance, connected with fibre directly to our LAN (one vlan), we have 3 switches (2524), one 2510.

I can monitor them with Fluke Optiview Analyzer.

 

The problem is: there ist Multicast traffic almost all the time.

Port Out utilization is 0,4%, there from about 80-90% Multicasts.

This can varie up to 96% and sometimes it comes to connection aborts.

 

 

Clients are PCs and Thinclients, which connect to Terminalservers with NLB.

Therefore they need multicasts, which i enabled via Webinterface.

 

This is the same config, which we use in several other dependancies, which do not have this problem.

Except the thin clients, which are only in this location.

 

Could this be the reason?

 

Regards

Rainer

 

 

 

 

 

2 REPLIES 2
Vince_Whirlwind
Trusted Contributor

Re: Multicast flood although IGMP enabled

Check that the multicast querier is disabled except on the switch you want to be querier.

Rainer Mittenzwey_2
Regular Advisor

Re: Multicast flood although IGMP enabled

Hi,

multicast querier is disabled on all the switches in the department.

Strange, that there are multicasts on all ports almost all the time.