Does taging/untaging affect flooding methods?

Hi,

Does taging/untaging affect flooding methods like unicast, multicast?

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Topology:

CLient site 1 ----PROVIDERA-----PROVIDERB-------- CLient site 2

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Client say's after changing untagged interface to tagged, multicast doesnt work.

But on "provider B" interfae show that switch interface multicast rate is increasing.

prov.2#sh interface GigabitEthernet1/1 | i multicast

Received 25894387662 broadcasts (124583820 multicasts)

prov.2#sh interface GigabitEthernet1/1 | i multicast

Received 25894397103 broadcasts (124593261 multicasts)

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Thank you

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