Thanks Rene,
I know this command but it’s only show statically configured mac addresses, what about dynamic learned by igmp snooping ? how can I verify them ? or they are only shown by “show ip igmp snooping groups” command ???
And I have four other questions :-
1- Can you please explain the robustness variable to me ??
The RFC2236 said :-
“The Robustness Variable allows tuning for the expected packet loss on a subnet. If a subnet is expected to be lossy, the Robustness Variable may be increased. IGMP is robust to (Robustness Variable-1) packet losses. The Robustness Variable MUST NOT be zero, and SHOULD NOT be one. Default: 2”
I understand that I must increased it when there is a packet loss in a subnet but I did not understand its effect or why must not be zero ??
2- what are the difference between the “show ip IGMP snooping” command and “show ip IGMP snooping detail” command since they are display the same output ??
3- what are the relationship between the TCN and IGMP snooping because I saw configuration part of them in global and per interface ???
4- I saw in the output of “show ip igmp snooping” command that IGMPv3 snooping not supported, how can I enable it or it’s platform dependent ??