Re: SVI Doubt

*so the decision whether to consult the routing engine or not lies in
destination field of frame ?*
**
* if svi let me hit routing engine or if non svi mac address then proceed
with regular switching procedures ....
*
**
On Sun, Dec 25, 2011 at 5:42 PM, shiran guez <shiranp3_at_gmail.com> wrote:

> SVI is a Switch Virtual Interface, however the MAC is very much not
> Virtual, The use of a single MAC for all SVI on the same platform is for
> save of MAC address's and is relaying on the Rule that in a single
> Broadcast Domain there should not be 2 or more same MAC address.
>
> Because each SVI is under a single / separated broadcast domain there is no
> problem of re-using the same MAC Address in all the SVI's of the same
> platform.
>
> Now for the L3 vs L2, packet is always routed , frame is always switched (7
> Layer OSI model).
>
>
> When user inside VLAN-x want to communicate
> with different user/server/node/etc
> * it will check first if he have a route to the IP, according to the
> IP/Subnet he is at and on his own routing table
> * if the IP is in his own subnet and he dose not have an ARPA record he
> will generate an ARP hoping to get a responce back and communicate directly
> with node
> *else if the IP is outside his Broadcast Domain, he will generate an ARP to
> the next hop (Router / Default Gateway)
> * if he dose not have already the ARPA record for that.
> * once he have it, he will send a frame with Destination MAC of the "SVI"
> in our case And IP of the Destination node.
> * then the switch will get that frame and route the packet according to his
> routing table.
>
>
>
> On Sun, Dec 25, 2011 at 4:11 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)
> >
> >
> >
>
>
> --
> 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
>
>
> Blogs and organic groups at http://www.ccie.net
>
> _______________________________________________________________________
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Received on Sun Dec 25 2011 - 17:48:34 ART