Why subinterface for Circuit?

[ohforce55]

Hi,

Why does some ISPs provide subinterface to their customer for circuit?

And what's the case when they just provide with a physical interface?

Which ISPs usually do provide subinterface?

Thank you in advance!

[Philip D'Ath]

Using sub-interfaces allows you to sell different seperate services to a client (such as VoIP and data).

The question about which ISPs do this will depend on what country you are talking about.

[ohforce55]

Philip,

Thanks for your reply!

ISPs in the US, which ISPs usually provide subinterface?

And what's the case they just give physical interface to client?

[Mark Malone]

ISPs in the US, which ISPs usually provide subinterface?
All of them in some form at some point in their ISP network will be using subs depending on what service technology is in place
And what's the case they just give physical interface to client?
A direct p2p link that has no tagging on it would not require sub interface , straight BGP link into the MPLS also should not require sub your side anyway but there side may differ as it could be point to multipoint there end

[Julio E. Moisa]

Hi

It could be because they are using Virtual Circuits like used for L2 VPN ATOM, EoMPLS, L2TPv3, VPLS, etc. So you can assign one VLAN per client.