How can I create Vlans when I upload a new startup-config?

Gerard Roy · ‎04-29-2008

I need to create vlans on a router via a new startup-config file. Anyone know the syntax?

william.caban · ‎04-29-2008

It will all depend on your actual router and modules.

If it is a switch+router you will either have the "vlan database" exec option or the "vlan XYZ" config option.

! Old style

vlan database

vlan 100

apply

exit

show vlan-switch

!

! New Style

config t

vlan 100

exit

show vlan

!

If it is a pure router, most probably, you will have to define the vlans "indirectly" using subinterfaces. (Note: If you don't define a native VLAN then, VLAN 1 will be assumed).

!

interface Ethernet0

description Physical Interface

!

interface Ethernet0.50

description Interface for VLAN 50 (native)

encapsualtion dot1Q 50 native

!

interface Ethernet0.100

description Interface for VLAN 100

encapsulation dot1Q 100

!

HTH,

-W

/rate post if it helps

jay77jay77 · ‎04-29-2008

hi

I have this experience - even if you dont create vlan using vlan database or conf t - vlan x command - eg. in c2811 with HWIC-4ESW, if i simply make one of the HWIC port as switch port access vlan xx and create interface vlanxx. I can assign ip address to the Vlanxx and use it as a layer 3 port. So in this what is the purpose of creating vlan with vlan database or conf t command?

Tks

Jay