VLAN interface IP

Hi,

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

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

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 "BernieM" ¼¶¼g©ó¶l¥ó·s»D :45b9b30e$0$3197$ snipped-for-privacy@ken-reader.news.telstra.net...

yes.

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

switch1--core switch--switch2

simplified example of the same thing. switches 1 and 2 are layer 2 switches while core switch is layer 3 and has vlan interfaces for the vlans on switches 1 and 2.

BernieM

Only two reasons:

2) Management. For telnet, etc... or for routing protcols (again Layer

Otherwise, for layer 2, the vlan does not need an IP.

a wrote: