[cisco-bba] Re: [cisco-nas] L2TP - va bandwidth

[Dennis Peng]

Anastassios Chatzithomaoglou [achatz at forthnet.gr] wrote:
> 
> 
> Dennis Peng wrote:
> 
> >I think it's time we started a mailing list for discussion of
> >BroadBand Aggregation (BBA) questions and issues. I'll contact the
> >host of cisco-nas to see if they could host this.
> >
> 
> :-))))
> 
> >Anastassios Chatzithomaoglou [achatz at forthnet.gr] wrote:
> >
> >>In a L2TP scenario where does the va interface get the bandwidth 
> >>description from?
> >
> >
> >The bandwidth is set by the value of the Tx and Rx Connect Speed AVP
> >in the ICCN that is sent by the LAC. If you do "debug vpdn
> >l2x-packet", you should see the decodes of the AVP that the LAC sends.
> >
> >
> 
> Do Cisco routers (when used as LACs) provide it automatically?

Actually, only the DSLAM will know what the DSL connection speed is,
so in order to really do this, the LAC and the DSLAM would need to be
collapsed in one box. If the LAC is simply receiving the PPPoA
sessions over an ATM interface, it doesn't know what the DSL
connection speed is. With a Cisco PPPoA LAC, we will look at the
shaping parameters configured on the VC and populate that into the Tx
and Rx Connect Speed AVP's when the LAC forwards the session.

Dennis

> Our Telco uses a Unisphere ERX-1400 (with IOS-like CLI ;-) as a LAC, but 
> they don't know how to enable this functionality ;-(
> 
> >>This is a PPPoA/L2TP customer (1024/256)
> >>
> >>router#sh int vi707
> >>Virtual-Access707 is up, line protocol is up
> >> Hardware is Virtual Access interface
> >> Description: ** FORTHNET **
> >> Interface is unnumbered. Using address of Loopback0 (x.x.x.x)
> >> MTU 1500 bytes, BW 622080 Kbit, DLY 100000 usec,
> >>    reliability 255/255, txload 1/255, rxload 1/255
> >>
> >>BW = 622080 Kbit
> >>
> >>
> >>
> >>This is a template used for our L2TP customers
> >>
> >>router#sh int virtual-template 3
> >>Virtual-Template3 is down, line protocol is down
> >> Hardware is Virtual Template interface
> >> Description: ** FORTHNET **
> >> Interface is unnumbered. Using address of Loopback0 (x.x.x.x)
> >> MTU 1500 bytes, BW 100000 Kbit, DLY 100000 usec,
> >>    reliability 255/255, txload 1/255, rxload 1/255
> >>
> >>BW = 100000 Kbit
> >>
> >>
> >>Is there a way i can have each va interface show each customer's dsl 
> >>speed?
> >
> >
> >If the LAC sends the correct speed information to us, then the
> >interface will reflect that information.
> >
> >Dennis
> >
> >
> >>-- 
> >>***********************************
> >>  Chatzithomaoglou Anastasios
> >>Network Design & Operations Center
> >>         FORTHnet S.A.
> >>     <achatz at forthnet.gr>
> >>***********************************
> >>
> >>
> >>_______________________________________________
> >>cisco-nas mailing list
> >>cisco-nas at puck.nether.net
> >>http://puck.nether.net/mailman/listinfo/cisco-nas
> >
> >
> 
> -- 
> ***********************************
>    Chatzithomaoglou Anastasios
> Network Design & Operations Center
>           FORTHnet S.A.
>       <achatz at forthnet.gr>
> ***********************************

-- 
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      ||        ||                                 Dennis Peng
      ||        ||        Cisco Systems, Inc.      Escalation Engineer
     ||||      ||||       170 West Tasman Drive    Phone: (408) 526-6143
 ..:||||||:..:||||||:..   San Jose, CA 95134       Fax:   (408) 232-2343
   Cisco Systems Inc.                              dpeng at cisco.com
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