Re: How I could stop the switch from learning the MAC

From: Paul Cosgrove (paul.cosgrove@heanet.ie)
Date: Fri May 09 2008 - 11:20:10 ART

Just to add that the command for ME3400s is "no mac address-table
learning vlan <vlan-id>".

http://www.cisco.com/en/US/docs/switches/metro/me3400/software/release/12.2_25_ex/command/reference/cli1.html#wpmkr4975059

Paul.

Paul Cosgrove wrote:
> I guess your aim is to allow traffic to transit the switch without it
> learning mac addresses of the sources.
>
> Service providers often want to do this when providing vlan circuits
> between customer LANs. If customers have large flat networks an
> aggregation SP switch could exhaust its CAM table. If a circuit is
> point to point then there is really no need to learn mac addresses, you
> just want to forward on whatever traffic hits the port at either end.
>
> You never mentioned the model of switch, but I do not think this is
> possible on 3550/3560/3750, though I believe you can do it on ME3400s.
>
> Paul.
>
>
>
> ccie wrote:
>> Dear Experts,
>>
>>
>>
>> How I could stop the switch from learning the MAC address-table
>> dynamically
>> for certain VLAN.
>>
>>
>> Regards,
>>
>> Amin
>>
>>
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>
> 

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