Re: SVI Doubt

Hi,

I believe you may be wrong on your understanding with this one.

1)If two hosts on the same switch within the same subnet communicate, then
normal ARP will occur. The switch doesn't have to interfere unless local
proxy arp is configred.
2)If the two hosts are on two different subnets, then proxy-arp will take
place. When user A wants to communicate with User B in a different subnet,
the switch replies with its own mac address and forwards the arp request on
its behalf. However in this case, the packet will not go to the routing
engine since the destination IP address remains host B throughout the
communication. When one of the hosts pings the SVI, both the destination IP
address & MAC address belong to the switch, then the packet will be
directed to the routing engine.

HTH,

Thanks

On Sun, Dec 25, 2011 at 5:11 PM, CCIE KID <eliteccie_at_gmail.com> wrote:

> 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)
> >>
> >>
> >> Blogs and organic groups at http://www.ccie.net
> >>
> >> _______________________________________________________________________
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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
> >
> >
>
>
> --
> With Warmest Regards,
>
> CCIE KID
> CCIE#29992 (Security)
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
> Subscription information may be found at:
> http://www.groupstudy.com/list/CCIELab.html
>
>
>
>
>
>
>
>

-- 
KJ
Blogs and organic groups at http://www.ccie.net