How to preempt rogue RAs?

Alan Batie alan.batie at
Thu Nov 4 21:37:00 CET 2010

On 10/31/10 3:05 AM, Mark Smith wrote:

> Agree, VLANs are pretty cheap. Their sub-interfaces on the router's
> also give you individual per-customer traffic monitoring and policy
> enforcement points.

They are a static configuration however, which makes them expensive.
PPP is dynamic and still gives you the virtual circuit functionality
needed to filter the flat lan.  One of the telcos we provide service to
switched from atm to ethernet dslams about a year ago and we're still
trying to get some customers moved from bridged to avoid the resulting
problems (partly caused by bugs in the dslams).  They are doing a
vlan/dslam which helps a little, but it was determined that
vlan/customer just didn't scale (the customer count nears the limit of
vlan ids also).

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