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Duplicate MAC Addresses effect

Hi All,

I have a query regarding the entry of duplicate MAC entries in switch. I tried issuing the following command:-

Switch(config)#mac address-table static 0007.e9f6.4fd2 vlan 1 interface fa0/2

Switch(config)#mac address-table static 0007.e9f6.4fd2 vlan 1 interface fa0/3

And after issuing the command, the resultant MAC table was as follows:-

1 0007.e9f6.4fd1 STATIC Fa0/2 Fa0/3

What does this signify. Where would a packet destined to this MAC address reach (I mean the port that it will reach)

Does it mean that there could be Network Load Balancing?

Thanks,

Sridhar.

3 REPLIES

Re: Duplicate MAC Addresses effect

HI

It will reach to the port where the end system is connected.u just deifined the mac-address as static on two ports u will not connect the end system to two ports so on the port which u r end system will connected will be up/up and on the port which the end system is not connected it will be in down state.hope i am correct in this if not plz correct me.

Thanks

Mahmood

Re: Duplicate MAC Addresses effect

What if, two computers are connected and they share the same mac address (virtual)

Regards,

Sridhar.

Re: Duplicate MAC Addresses effect

HI

I have not tested this but i think if a switch learns the same mac-address on two ports it assumes that a loop is generated in network and i think it is going to block on link.

Thanks

Mahmood

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