Multicast passed from one Mrouter to another - without reason?

I have a L3 switch N5K environment connected to 4500 x (Switch L2).

they have relationship neighbor PIM and eigrp on the same interface VLAN.

I added a new switch L3 N5K (N5K2) - I have added to the same VLAN for the EIGRP and PIM neighbor relationship.

at the moment there is nothing connected to N5K2 - all hosts are connected to N5K1.

There is a multicast stream to switch to basic heading the hosts in N5K1.

for some reason-the multicast even come N5K2 - despite the fact that there is no host who are listening to it.

Watch http://lisa.mindbit.ro/wiki/doku.php?id=igmp_snooping

beavhior IGMP should be 1 Mrouter interfece multicast will not go to a different interface from the mrouter except the mrouter had joined this group.

so why I get these multicasts?

Hello.

I'm not sure about the article.

By RFC 4541 (see section 2.1.2):

1) Packets with a destination IP address outside 224.0.0.X which are
      not IGMP should be forwarded according to group-based port
      membership tables and must also be forwarded on router ports.
You can also find interesting the questionnaire in section 4 of the RFC (and question 6).

Tags: Cisco Network

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