Re: SVI Interfaces has same MAC

Hi fellas,

Can anyone tell me the logic behind it . Why they use the same MAC address
for all SVIs ? Is there any reason behind it
Wat caveats can i expect if i see the same MAC address for al SVI's

On Tue, Oct 11, 2011 at 1:13 PM, Lindsay Hill <lindsay.k.hill_at_gmail.com>wrote:

> 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
>
>
>
>
> --
>
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>
>
> CCIE KID
>
> CCIE#29992 Security
>
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IN PURSUIT OF CCIE
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