[j-nsp] cable modem/dsl/ftth bandwidth limiting

[Paul Stewart]

We are moving everything to "the edge".   I mean that the BRAS on DSL will
be doing it via profiles and on our CMTS systems it's already incorporated
into the cable mode profile.  We were previously doing a lot more of the
"rate limiting" in Radius profiles which were used by ERX (and Cisco 7200)
specific to PPPOE on DSL but found it easier and more consistent to do DSLAM
speed profiles... a lot less "moving parts" involved doing it this way - at
least in our environment.

Paul


-----Original Message-----
From: juniper-nsp-bounces at puck.nether.net
[mailto:juniper-nsp-bounces at puck.nether.net] On Behalf Of Chris Evans
Sent: June-19-12 1:20 PM
To: juniper-nsp at puck.nether.net
Subject: [j-nsp] cable modem/dsl/ftth bandwidth limiting

Question for you service provider folks.  How do cable modems, dsl, ftth,
etc limit bandwidth? I believe that everything is limited at the customer
edge demarq device, performing bandwidth limits on a central network device
would be too costly to do.

Do the CE devices use a form of traffic shaping, policing or some other
algorithm?? I believe it's just traffic shaping as I've looked at packet
captures and never see too many retrans taking place.

Thanks for any info you can provide!
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