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New Member

Block Multicast 224.0.1.35 ????

How to block Multicast traffic on a switch? I tried regular ACL like

"deny ip any host 224.0.1.35

permit ip any any"

to block multicast to 224.0.1.35 and allow others, but it seems not works !!

Please anybody give me an example of how to block them ?

Thanks.

2 REPLIES
New Member

Re: Block Multicast 224.0.1.35 ????

Your message post indicates switch. I am assuming you mean layer 2 switch. The access-list you defined is for layer 3. Try creating a layer 2 access policy. You will need to figure out the MAC address used by the application. Multicast MAC addresses use a special 24-bit prefix of 0x0100.5Enn.nnnn.

Hope this helps.

New Member

Re: Block Multicast 224.0.1.35 ????

They are layer 3 switches. I found some Cisco examples showing the same as wh at I used, But NOT WORK !! I applied that ACL to the out and in interface, but I still can capture the multicast traffic go through it ?? The hardware is 4006, do I need upgrade IOS or something to support that ?

Thanks.

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