Re: SVI Doubt

Kid,
you can think of the L3 inside the switch as just another host wich
happens to have the base MAC. So the switch always switches no matter
what, and the L3 engine just does L3 (and other stuff) for all the
frames it gets. So you were right.

(This "internal" host corresponds to the punt destination in CEF)
-Carlos

CCIE KID @ 25/12/2011 11:11 -0300 dixit:
> Hi fellas,
>
> How does a L3 switch recognize that it should switch the packet or do the
> routing engine. To my understanding If a frame is received with the SVI MAC
> Address ( Virtual MC ) if there is a L3 Switch and it is running SVI
> interface as its gateway..
> And that is the gateway given to the host machine.
>
> So when it receives a frame with SVI MAC, the packet will be send to the
> routing engine.
>
> Correct me if i am wrong
>
> How does the L3 switch internally knows that frame is to switch or send it
> to the routing engine? How does it decide ?
>
>
>
>
>
> On Sun, Dec 25, 2011 at 6:44 PM, shiran guez <shiranp3_at_gmail.com> wrote:
>
>> When performing a show version you can see:
>>
>> *Base ethernet MAC Address: *XX:XX:XX:XX:XX:XX
>>
>> That is the address used by the SVI (all of them)
>> And all the other ports are incremented
>>
>> So
>> F0/1 will be XX:XX:XX:XX:XX:X1
>> F0/2 will be XX:XX:XX:XX:XX:X2
>> ...
>>
>> On the MAC address table you can see the STATIC and normally the first MAC
>> is the SVI's MAC, the others are the physical ports
>>
>> sh mac address-table | in STATIC
>>
>> For a SVI to transition to the port stat up/up
>>
>> You must have the following conditions:
>>
>> * vlan must exist in VLAN database
>> * vlan need to be assigned to at least one switched port
>> * and the port must be in STP forwarding state
>>
>> if all this are met the port will transition automatically, and that is
>> what called SVI autostate
>>
>> Regards,
>>
>> Shiran Guez
>>
>> On Sun, Dec 25, 2011 at 2:47 PM, CCIE KID <eliteccie_at_gmail.com> wrote:
>>
>>> Hi fellas,
>>>
>>> I am having a SVI interface. when a host arp for the default gateway MAC,
>>> the Layer three switch forwards the SVI Virtual MAC to the host . Where
>>> does the SVI Virtual MAC ?. Is the virtual MAC gets stored in normal MAC
>>> table ?
>>>
>>> Wat does SVI Autostate mean exactly. Can anyone explain me Autostate ?
>>>
>>> --
>>> With Warmest Regards,
>>>
>>> CCIE KID
>>> CCIE#29992 (Security)
>>>
>>>
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>>
>> --
>> Shiran Guez
>> MCSE CCNP NCE1 JNCIA-ENT JNCIS-ENT CCIE #20572
>> http://cciep3.blogspot.com
>> http://www.linkedin.com/in/cciep3
>> http://twitter.com/cciep3
>>
>>
>
>

-- 
Carlos G Mendioroz  <tron_at_huapi.ba.ar>  LW7 EQI  Argentina
Blogs and organic groups at http://www.ccie.net