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Multicast, IGMP and ACL's


Maybe somebody can describe me why in ACL You are able to specify IGMP code only up to 15 while the

number for Leave message is 0x17 (RFC2236)? Host report is not 2, and host query is not 1 in original packets

but it is in ACL. I've dig all over the cisco site and didn't find nothing about it. This is serious security leak

actually, it is possible to influence the multicast flow.

Best regards Matvey Teplov


Re: Multicast, IGMP and ACL's

Since there has been no response to your post, it appears to be either too complex or too rare an issue for other forum members to assist you. If you don't get a suitable response to your post, you may wish to review our resources at the online Technical Assistance Center ( or speak with a TAC engineer. You can open a TAC case online at

If anyone else in the forum has some advice, please reply to this thread.

Thank you for posting.