Any router will automatically join at least two multicast groups on each interface. How do I see that on a Cisco router?
I know that they all join these two groups: all multicast nodes and all routers.
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I knew that a router will listen to these group addresses and I was also looking for the same info (command line) for IPv6.
show ipv6 interfaces <type/number>. IPv6 may use a lot of multicast addresses because it doesn't have broadcast.
Router1#sh ipv6 interface GigabitEthernet0/0 is administratively up, line protocol is up IPv6 is enabled, link-local address is FE80::1 Global unicast address(es): 2001:DB8:ABCD:EF::2, subnet is 2001:DB8:ABCD:EF::/64 Joined group address(es): FF02::1 FF02::2 FF02::1:FF00:2 MTU is 1500 bytes ...