Need Clarification about Configuring a Cisco 2951 as a internet router or perimeter router

I clarification on something.  The ISP gave us our IP blocks and a VLAN. Here is my config for the port that will connect back to them with the /30 address and VLAN configured.  I understand that on a router have to create sub-interface for the VLAN.  Does the VLAN part have to be configured anywhere else in my network?  Is it only between my perimeter router and the ISP so they will know how to distinguish our traffic?

Thanks for any clarification

!
interface gigabiethernet 0/1
description to ISP WAN
no ip address
full-duplex
speed 100
no shutdown
!
interface gigabitethernet 0/1.1
description to ISP WAN
encapsulation dot1q 45
ip address xxx.xxx.xxx.xxx 255.255.255.252
no shutdown
!
ucftimmAsked:
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RafaelConnect With a Mentor Commented:
Although, you can have the same VLAN number and or IP in the network, you should not do that unless you're extending your VLAN.  In this case you are not. So...

For this purpose you only need to configure the VLAN on this end.

HTH
-Rafael
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ucftimmAuthor Commented:
Thank you for that clarification.
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RafaelCommented:
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