[nsp] DSL customers seeing each other (fwd)

[Rick G]

> Hi--
>
> I asked a couple of related questions recently on the cisco-bba list.
> One is about DSL users [not] seeing each other when they are aggregated
> via IRB, and whether there is any q&d fix I can do to make that happen.
> The other is about migrating from IRB to RBE (which will, probably,
> solve the first question but not immediately).

This is a problem in a bridge configuration regardless of your setup (IRB or
RBE) - it will occur with all
customer's within the same interface / sub-interface (it's a broadcast storm
/ security feature.../bug for some).  Since you are in Verizon EAST
territory and the recipient of their horrible Redback Bridge Configuration,
your only option is to pay them for their "Direct PVC" service, which allows
you to pay them additional money every month to fix their network and offer
you a direct routed connection off a switch.  Check
http://www.westnet.com/verizonisp/.  There is a group for ISP's that are
Verizon ADSL customers with ATM DS3 / DS1 that might be able to assist on
the IRB to RBE conversion and not bore the other users on this list with
crap we have to put up with to support ourselves on Verizon's network
(unless of course the users on this list wish to laugh at us for putting up
with it....)

Eric


>
> I did get one enlightening response to the second question that helped
> move me along a little (thank you!) but that was all.  I don't know
> whether the cisco-bba list is not well populated or whether I am
> asking stupid questions.  Hoping that it's the former more than the
> latter I guess I will repeat here..
>
> Yours,
> -mm-
>
>
>
> ----- Forwarded message from "Mark E. Mallett" <mem at mv.mv.com> -----
>
> > Subject: [cisco-bba] DSL customers seeing each other
> > From: "Mark E. Mallett" <mem at mv.mv.com>
> > Date: Wed, 6 Aug 2003 15:47:25 -0400
> > To: cisco-bba at puck.nether.net
> >
> > Hi-
> >
> > I'm sure this has come up but I can't find it in various archives.  We
> > have a Cisco 7200 with some DSL customers bridged on several ATM
> > PVCs.  This is Verizon EAST- unlike some other providers where DSL
> > connections each get their own PVC, while there are multiple PVCs
> > quite a number of DSL connections are bridged on the same PVC, and the
> > multiple PVCs are bridged together.  We're using an IRB
> > configuration.  An issue is that individual customers can't see each
> > other.  I can see ARP requests come in but since broadcasts are not
> > propagated between customers they do not get answered.
> >
> > Short of going to RBE, is there a way to make the router respond to
> > ARP requests on the DSL subnet(s) with its own MAC address?  Kind
> > of like a proxy arp, but for the same subnet (like a local-proxy-arp
> > in other environments).  I suspect the response is "use RBE"-- that's
> > perfectly valid but I'm wondering if IRB mode can be made to do this
> > as an interim fix.  (I have another set of questions about RBE for
> > another message .. this list is too quiet anyway, no?)
> >
> > (BTW we have some other DSL aggregation with a CLEC on another ATM
> > circuit- that CLEC intercepts the ARP requests on the DSL subnet(s)
> > before they get to us and respond with our MAC address).
> >
> > The IRB configuration is something like:
> >
> > bridge irb
> > !
> > interface BVI10
> >  description DSL BVI
> >  mac-address 0000.xxxx.yyyy
> >  ip address 192.168.10.1 255.255.255.0
> >  no ip proxy-arp
> >  ip route-cache same-interface
> >  no ip mroute-cache
> > !
> > interface ATM1/0.1 multipoint
> >  description DSL #1
> >  no ip proxy-arp
> >  pvc dsl1 1/301
> >  !
> >  bridge-group 10
> >  bridge-group 10 spanning-disabled
> > !
> > interface ATM1/0.2 multipoint
> >  description BA DSL #2
> >  no ip proxy-arp
> >  pvc dsl2 1/302
> >  !
> >  bridge-group 10
> >  bridge-group 10 spanning-disabled
> > !
> > ! repeat for other PVCs
> > !
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