intervlan routing

liven

Just a quick question

when setting up the subinterface on the router,

does the subinterface number:

int fa0/1.1

does the .1 tie the interface to the vlan, or is it the number

encapsulation dot1q 1

that associates them the subinterface with the particular vlan?

Did that make sense?

dtlokee

The encapsulation command ties the subinterface to the VLAN number, but for consistency you should use the same sub-interface number as the VLAN number also.

Pash

int fa 0/0.1
encap dot1q 1
ip address 192.100.1.3 255.255.255.0
no shut
!
int fa 0/0.5
encap dot1q 5
ip address 192.100.5.1 255.255.255.0
no shut
!
int fa 0/0.10
encap dot1q 10
ip address 192.100.10.1 255.255.255.0
no shut
!
int fa 0/0.20
encap dot1q 20
ip address 192.100.20.1 255.255.255.0
no shut
!

I did something like this for a router on a stick lab for my ccna a while back ^^ As you say dot1q is for your vlan number, as dt says; the sub interface number is just for good housekeeping.

liven

Thanks gents!

Slowhand

I did the exact same thing as Pash did, for my router-on-a-stick setup. It's a good idea to assign the same numbered vlan to a particular subinterface, just for the sake of clarity. At my old job, everyone did the same thing on the production environment, even the CCIE-candidate Sr. Engineer. Anything to make your life/job easier is a good thing.