From: Thomas Fowles (tfowles@gmail.com)
Date: Fri May 30 2008 - 08:52:40 ART
Marc-
This tech note ("Multicast Does Not Work in the Same VLAN in Catalyst
Switches") might be of interest to you:
http://www.cisco.com/en/US/products/hw/switches/ps708/products_tech_note09186a008059a9df.shtml
It provides 4 alternate solutions to the problem.
Another way you might want to consider addressing the issue is to create a
separate VRF for your heartbeat VLAN. You can then create an SVI and/or
enable multicast routing without having to worry about the traffic or routes
entering the global routing space.
HTH
-Tom
CCIE#18762
http://www.linkedin.com/in/thomasfowles
On Fri, May 30, 2008 at 7:40 AM, Thomas Fowles <tfowles@gmail.com> wrote:
> Marc-
>
> Is this on a single switch or does it span multiple switches (across a
> trunk)? What switch platform are you using? 3560's handle things a little
> differently than 6500's.
>
> -Tom
> CCIE#18762
>
> http://www.linkedin.com/in/thomasfowles
>
>
>
>
> On Fri, May 30, 2008 at 3:33 AM, Marc La Porte <marc.a.laporte@gmail.com>
> wrote:
>
>> hey experts,
>>
>> is there any way I can have multicast working on a pure Layer2 VLAN?
>> by that i mean that there is not even an SVI configured, but just an IP
>> address range reserved to be used for users within that VLAN.
>>
>> all the solutions I see require an IP address on the SVI.
>> i am looking for a solid solution, and so configuring static multicast MAC
>> addresses is not an option.
>>
>> (this is a real life scenario: customer wants a pure Layer2 (floating)
>> VLAN
>> for security reasons, but needs multicast to work for Red Hat XEN cluster
>> heartbeat)
>>
>> thanks for your input
>> marc
>>
>>
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