VLAN interface IP

VLAN interface IP

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Subject Author Date
VLAN interface IP a 01-26-2007
Posted by a on January 26, 2007, 12:02 am
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Hi all,

There is an IP address for the VLAN interface. VLAN is basically a group of
computer sharing the same network address and subnet mask. The VLAN
interface IP is like an address of no where. What is the purpose of the VLAN
interface IP?

Thanks



Posted by Sven on January 26, 2007, 2:01 am
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a wrote:
> Hi all,
>
> There is an IP address for the VLAN interface. VLAN is basically a group of
> computer sharing the same network address and subnet mask. The VLAN
> interface IP is like an address of no where. What is the purpose of the VLAN
> interface IP?
>
> Thanks
>
>
Hi,

It's only for management purpose. (ping, access and configuration of
your switch whith telnet/ssh/http)

Posted by BernieM on January 26, 2007, 2:52 am
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> Hi all,
>
> There is an IP address for the VLAN interface. VLAN is basically a group
> of
> computer sharing the same network address and subnet mask. The VLAN
> interface IP is like an address of no where. What is the purpose of the
> VLAN
> interface IP?
>
> Thanks
>
>

If it's a layer 3 switch than the vlan interface ip address becomes the
default gateway for that subnet.



Posted by a on January 26, 2007, 3:29 am
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I think the so-called layer 3 switch is the integration of router and switch
in the same box, right?
So, the vlan interace ips are always the default gateway for the VLANs under
the same switch. Am I right?

Is it for the VLAN
:45b9b30e$0$3197$c30e37c6@ken-reader.news.telstra.net...
>
> > Hi all,
> >
> > There is an IP address for the VLAN interface. VLAN is basically a group
> > of
> > computer sharing the same network address and subnet mask. The VLAN
> > interface IP is like an address of no where. What is the purpose of the
> > VLAN
> > interface IP?
> >
> > Thanks
> >
> >
>
> If it's a layer 3 switch than the vlan interface ip address becomes the
> default gateway for that subnet.
>
>




Posted by BernieM on January 26, 2007, 4:02 am
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>I think the so-called layer 3 switch is the integration of router and
>switch
> in the same box, right?

yes.

> So, the vlan interace ips are always the default gateway for the VLANs
> under
> the same switch. Am I right?

yes but the vlan might just be getting trunked through the switch to another
that has access ports in that vlan.

switch1--core switch--switch2--switch3

switches 1,2 and 3 might be assigned different vlans so vlan 3 (for switch3)
needs to be trunked through switch2. For switch3 hosts to talk to switch1
hosts they use their default gateway which are vlan interfaces on the core
switch. This example isn't necessarilly a good design I'm just showing how
vlan interfaces are layer-2 adajacent to hosts uysing them but not
necessarilly on their directly attached switch.

BernieM

>
> Is it for the VLAN
> :45b9b30e$0$3197$c30e37c6@ken-reader.news.telstra.net...
>>
>> > Hi all,
>> >
>> > There is an IP address for the VLAN interface. VLAN is basically a
>> > group
>> > of
>> > computer sharing the same network address and subnet mask. The VLAN
>> > interface IP is like an address of no where. What is the purpose of the
>> > VLAN
>> > interface IP?
>> >
>> > Thanks
>> >
>> >
>>
>> If it's a layer 3 switch than the vlan interface ip address becomes the
>> default gateway for that subnet.
>>
>>
>
>
>



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