Cisco Support Community
cancel
Showing results for 
Search instead for 
Did you mean: 
Announcements

Welcome to Cisco Support Community. We would love to have your feedback.

For an introduction to the new site, click here. If you'd prefer to explore, try our test area to get started. And see here for current known issues.

New Member

MPLS Handling of Aggregated ADSL-connected sites

I'm familiar with serially-connected sites entering an MPLS core, where there is a physical connection associated with each site, and so the site is simply identifiable to the MPLS PE by virtue of a physical port. However, I'm trying to get my head round how to handle ADSL connections, where many sites' traffic is aggregated into one bearer. How does the MPLS network associate the right traffic with the right site under these conditions? Sorry if this is a bit of a "dumb newbie" question, but I've googled extensively, and just haven't got to the stage where I feel confident in my understanding.

Jim

2 REPLIES

MPLS Handling of Aggregated ADSL-connected sites

Hi JIm,

How does your ADSL site gets the IP address??

Is it statically defined, or it is negotiated.

If negotiated, by whom it is been assigned; by ISP or your own RAS ?

Also, it would be great, if you can provide  a sample topology for reference.

Regards,

Smitesh

New Member

Re: MPLS Handling of Aggregated ADSL-connected sites

Hi Jim,

When using DSL most architectures use PPPoA/PPPoE (you could just bridge at the dslam and use no PPP but that would result in a subinterface a VRF could be configured on).

PPP will create a virtual-access interface per PPP authentication (username).

When the virtual interface is being created the provider router (LNS) will ask a radius server if the user can be granted access. If yes, the radius can also give the router configuration information which can include IP address and VRF.

Ultimately the traffic is kept separate because point to point logical sessions can be built on top of a multi access network (PPPoE).

Hope this helps,

Matt Ayre

543
Views
0
Helpful
2
Replies