Re: SVI Interfaces has same MAC

It depends a bit on the platforms - some use the same MAC, some change.

Theoretically, it shouldn't matter - they're in different VLANs, so it doesn't
matter if the MAC address is the same, since the mac address table takes into
account the VLAN.

Check out this link for a little more info and some examples:
http://cciepursuit.wordpress.com/2008/04/21/beware-the-man-of-one-platform/

On 11/10/2011, at 7:50 PM, CCIE KID wrote:

> Here is the detail output
>
> R3(config-if)#do sh int vlan 10 | i address
> Hardware is EtherSVI, address is c202.14d8.0000 (bia c202.14d8.0000)
> Internet address is 10.1.1.3/24
> R3(config-if)#
> R3(config-if)#
> R3(config-if)#do sh int vlan 20 | i address
> Hardware is EtherSVI, address is c202.14d8.0000 (bia c202.14d8.0000)
> Internet address is 20.1.1.3/24
>
>
> Can anyone say why two different SVIs use same MAC address.
>
> On Tue, Oct 11, 2011 at 11:57 AM, CCIE KID <eliteccie_at_gmail.com> wrote:
>
>> Hi fellas,
>>
>> I find different SVI's has same MAC address .Like SVI for Vlan 10 and SVI
>> for Vlan 20 has same virtual MAC address. I want to know the reason why
they
>> both have same MAC address. Is there any reason behind it to do this kind
of
>> design. This is my config
>>
>> int vlan 10
>> ip add 10.1.1.1 255.255.255.0
>>
>> int vlan 20
>> ip add 20.1.1.1 255.255.255.0
>>
>> and I find same virtual MAC address when i do sh ip int vlan
>>
>>
>>
>> --
>> With Warmest Regards,
>>
>> CCIE KID
>> CCIE#29992 Security
>>
>
>
>
> --
> With Warmest Regards,
>
> CCIE KID
> IN PURSUIT OF CCIE
>
>
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Received on Tue Oct 11 2011 - 20:43:43 ART