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Originally Posted by Ignitionnet
Even though it's a crazy architecture they wanted to use the same one for both xDSL and business cable, so every business modem uses an L2TP tunnel to a PPP service module, these also terminate L2TP from BT, and from there get encapsulated again and terminate on the same BAMs/BRAS as the Virgin National service.
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So what you're saying is, the business fixed-IP service is dependent on now obsolete kit used to run the now non-existent national ADSL service and the partly-installed-but-later-abandoned FTTC-LLU project? Lovely!
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No-one could give a reason why it's done that way beyond a comment about the CMTS  . It's completely contrary to the 'standard' methods which you can find plenty of documentation on on vendor websites.
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Vendor schmendor.
I've seen enterprise deployments that rely on nothing but MAC-address based port security and who genuinely believed it was actually effective, based on vendor documentation...