Vlan ip addressing

[limejudo]

Once you configure a VLAN on a switch, where does that vlan get it's ip from? Do you use a router or RSM card and creat vlan interfaces with an ip address range?

thx

Eric - A+, Net+, INet+ CCNA next week.
Network Admin/Helpdesk II

http://www.usunwired.com

 

[vipergg]

Yes you would have to have a router or l2/l3 switch with a layer 3 address assigned to it . Any ip assigned to a layer 2 switch only is for manageing the switch and nothing else . With a router just configure an interface and plug it into a port on the switch . With an rsm that is a different story , you get into createing layer 3 svi's on the rsm side then assigning vlans on the layer 2 side for your conenctions.

 

[limejudo]

Ok. I see. So I can create 10 vlans on a layer 2 switch that't trunked to a router, but on the router I would need to create 10 subint for each vlan.

But how would the vlan know which interface to pull the ip address from? "encap dot1q vlan 3 native", maybe?




Eric - A+, Net+, INet+ CCNA next week.
Network Admin/Helpdesk II

http://www.usunwired.com

 

[KiscoKid]

Yes the 'encap dot1q vlan' command is the 'link' between router and switch to indicate which sub-interface (and therefore IP address) on the router is related to which VLAN on the switch. The 'native' identifier need not be specified on every sub-interface - just on the interface which is te native VLAN for the trunk port (i.e. the VLAN that is untagged)

 

[limejudo]

Got it, thanks. Been looking threw the Cisco Cookbook and it explained it again.

Thx guys.

Eric - A+, Net+, INet+ CCNA next week.
Network Admin/Helpdesk II

http://www.usunwired.com