Mac Table Overflow

[Saeedullah Khan]

Hi,

I have to come this question related to mac-address table overflow.

Suppose i have fully network with vlans, trunks etc and every switch has different vlans and same vlan user exists on different switches.

When hacker that connected on SW1(Vlan 20) - F0/10 and overflow (Approx. 1,00000 addresses) on the switch mac table so my question is, is this overflow addresses will forward( as trunk) to other swicthes if same vlan 20 exist on other switches.

Also, when one switch mac table overflow then what happend, is the switch abnormal and not responding/OR any new machine will not entertain for new mac address.

Regards,

Saeed

[cadet alain]

Hi,

when CAM table is overflowed then the switch behaves like a hub by flooding frames and so these frames will get to the other switches via trunk but as the other switches won't be overflowed they will have the regular forwarding behaviour with the flooding of unknown unicast and broadcast/multicast.

Regards

Alain

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[Saeedullah Khan]

Thanks for your reply.

When these overflow mac addresses table will clear their table. Is there any specific time period for removing those addresses?