[AusNOG] DSLAM Dropout issues

[Mark Smith]

On Fri, 29 Apr 2011 01:42:59 +0930
"Stavros Patiniotis" <stavros at staff.esc.net.au> wrote:

> Hello,
> 
> For simplicity I'll answer all the questions here in one reply.
> 
> The dslams, which are used in private building setups, where purchased from
> Versatek. The model is the 24 port adsl2+ vx1000mdi -
> http://www.versatek.com./products/vx1000md.htm.
> 
> Originally the BRAS were Mikrotik RB450G, but not being familiar with these
> devices, I recently installed a Cisco 1841. Before we took over the services
> where in bridged mode, but we've made an effort of the last couple months to
> swap to pppoe. This is when we've noticed the problem as radius reports
> between Lost-Carrier & User-Request disconnects etc. The dslam functionality
> is very basic and so there is no way to tell if a port is losing sync,
> unless you are polling a web interface every 30 seconds (which I haven't
> done).  
> 
> I have tried a couple different firmware versions (as supplied by versatek),
> as a result of this issue, with no improvement.
> 
> A trace of PPP on the bras and modem shows that the modem's are requesting
> the disconnect, even though all keepalives are being received and modems in
> nailed up mode etc. http://pastebin.com/PK3MjQgy 
> 
> We have customers using a variety of modems eg Netgear, TPlink, VER170P and
> Netcomm NB5, NB6 etc. The PPP drops happens on the nb6plu4w but not the nb6.
> Running a windows 7 pppoe session through the nb6plus4w (ie as a simple
> bridge) will solve the problem.
> 

Recently added a bras? Try the latest firmware with the nb6plus4w.
There was a fault with them where once you had a certain number of
brases, PPP on the modem wouldn't come back up after an ADSL drop out. 

> Stavros
> 
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